+
−/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
−/* This Source Code Form is subject to the terms of the Mozilla Public
+
− * License, v. 2.0. If a copy of the MPL was not distributed with this
+
− * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
−
+
−/*
+
−** File:            ptthread.c
+
−** Descritpion:        Implemenation for threds using pthreds
+
−** Exports:            ptthread.h
+
−*/
+
−
+
−#if defined(_PR_PTHREADS) || defined(_PR_DCETHREADS)
+
−
+
−#include "prlog.h"
+
−#include "primpl.h"
+
−#include "prpdce.h"
+
−
+
−#include <pthread.h>
+
−#include <unistd.h>
+
−#include <string.h>
+
−#include <signal.h>
+
−#include <dlfcn.h>
+
−
+
−#if defined(OPENBSD) || defined(FREEBSD) || defined(DRAGONFLY)
+
−#include <pthread_np.h>
+
−#endif
+
−
+
−#ifdef SYMBIAN
+
−/* In Open C sched_get_priority_min/max do not work properly, so we undefine
+
− * _POSIX_THREAD_PRIORITY_SCHEDULING here.
+
− */
+
−#undef _POSIX_THREAD_PRIORITY_SCHEDULING
+
−#endif
+
−
+
−#ifdef _PR_NICE_PRIORITY_SCHEDULING
+
−#undef _POSIX_THREAD_PRIORITY_SCHEDULING
+
−#include <sys/resource.h>
+
−#ifndef HAVE_GETTID
+
−#define gettid() (syscall(SYS_gettid))
+
−#endif
+
−#endif
+
−
+
−/*
+
− * Record whether or not we have the privilege to set the scheduling
+
− * policy and priority of threads.  0 means that privilege is available.
+
− * EPERM means that privilege is not available.
+
− */
+
−
+
−static PRIntn pt_schedpriv = 0;
+
−extern PRLock *_pr_sleeplock;
+
−
+
−static struct _PT_Bookeeping
+
−{
+
−    PRLock *ml;                 /* a lock to protect ourselves */
+
−    PRCondVar *cv;              /* used to signal global things */
+
−    PRInt32 system, user;       /* a count of the two different types */
+
−    PRUintn this_many;          /* number of threads allowed for exit */
+
−    pthread_key_t key;          /* thread private data key */
+
−    PRBool keyCreated;          /* whether 'key' should be deleted */
+
−    PRThread *first, *last;     /* list of threads we know about */
+
−#if defined(_PR_DCETHREADS) || _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+
−    PRInt32 minPrio, maxPrio;   /* range of scheduling priorities */
+
−#endif
+
−} pt_book = {0};
+
−
+
−static void _pt_thread_death(void *arg);
+
−static void _pt_thread_death_internal(void *arg, PRBool callDestructors);
+
−static void init_pthread_gc_support(void);
+
−
+
−#if defined(_PR_DCETHREADS) || _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+
−static PRIntn pt_PriorityMap(PRThreadPriority pri)
+
−{
+
−#ifdef NTO
+
−    /* This priority algorithm causes lots of problems on Neutrino
+
−     * for now I have just hard coded everything to run at priority 10
+
−     * until I can come up with a new algorithm.
+
−     *     Jerry.Kirk@Nexwarecorp.com
+
−     */
+
−    return 10;
+
−#else
+
−    return pt_book.minPrio +
+
−	    pri * (pt_book.maxPrio - pt_book.minPrio) / PR_PRIORITY_LAST;
+
−#endif
+
−}
+
−#elif defined(_PR_NICE_PRIORITY_SCHEDULING)
+
−/*
+
− * This functions maps higher priorities to lower nice values relative to the
+
− * nice value specified in the |nice| parameter. The corresponding relative
+
− * adjustments are:
+
− *
+
− * PR_PRIORITY_LOW    +1
+
− * PR_PRIORITY_NORMAL  0
+
− * PR_PRIORITY_HIGH   -1
+
− * PR_PRIORITY_URGENT -2
+
− */
+
−static int pt_RelativePriority(int nice, PRThreadPriority pri)
+
−{
+
−    return nice + (1 - pri);
+
−}
+
−#endif
+
−
+
−/*
+
−** Initialize a stack for a native pthread thread
+
−*/
+
−static void _PR_InitializeStack(PRThreadStack *ts)
+
−{
+
−    if( ts && (ts->stackTop == 0) ) {
+
−        ts->allocBase = (char *) &ts;
+
−        ts->allocSize = ts->stackSize;
+
−
+
−        /*
+
−        ** Setup stackTop and stackBottom values.
+
−        */
+
−#ifdef HAVE_STACK_GROWING_UP
+
−        ts->stackBottom = ts->allocBase + ts->stackSize;
+
−        ts->stackTop = ts->allocBase;
+
−#else
+
−        ts->stackTop    = ts->allocBase;
+
−        ts->stackBottom = ts->allocBase - ts->stackSize;
+
−#endif
+
−    }
+
−}
+
−
+
−static void *_pt_root(void *arg)
+
−{
+
−    PRIntn rv;
+
−    PRThread *thred = (PRThread*)arg;
+
−    PRBool detached = (thred->state & PT_THREAD_DETACHED) ? PR_TRUE : PR_FALSE;
+
−    pthread_t id = pthread_self();
+
−#ifdef _PR_NICE_PRIORITY_SCHEDULING
+
−    pid_t tid;
+
−#endif
+
−
+
−#ifdef _PR_NICE_PRIORITY_SCHEDULING
+
−    /*
+
−     * We need to know the kernel thread ID of each thread in order to
+
−     * set its nice value hence we do it here instead of at creation time.
+
−     */
+
−    tid = gettid();
+
−    errno = 0;
+
−    rv = getpriority(PRIO_PROCESS, 0);
+
−
+
−    /* If we cannot read the main thread's nice value don't try to change the
+
−     * new thread's nice value. */
+
−    if (errno == 0) {
+
−        setpriority(PRIO_PROCESS, tid,
+
−                    pt_RelativePriority(rv, thred->priority));
+
−    }
+
−#endif
+
−
+
−    /*
+
−    ** DCE Threads can't detach during creation, so do it late.
+
−    ** I would like to do it only here, but that doesn't seem
+
−    ** to work.
+
−    */
+
−#if defined(_PR_DCETHREADS)
+
−    if (detached)
+
−    {
+
−        /* pthread_detach() modifies its argument, so we must pass a copy */
+
−        pthread_t self = id;
+
−        rv = pthread_detach(&self);
+
−        PR_ASSERT(0 == rv);
+
−    }
+
−#endif /* defined(_PR_DCETHREADS) */
+
−
+
−    /* Set up the thread stack information */
+
−    _PR_InitializeStack(thred->stack);
+
−
+
−    /*
+
−     * Set within the current thread the pointer to our object.
+
−     * This object will be deleted when the thread termintates,
+
−     * whether in a join or detached (see _PR_InitThreads()).
+
−     */
+
−    rv = pthread_setspecific(pt_book.key, thred);
+
−    PR_ASSERT(0 == rv);
+
−
+
−    /* make the thread visible to the rest of the runtime */
+
−    PR_Lock(pt_book.ml);
+
−    /*
+
−     * Both the parent thread and this new thread set thred->id.
+
−     * The new thread must ensure that thred->id is set before
+
−     * it executes its startFunc.  The parent thread must ensure
+
−     * that thred->id is set before PR_CreateThread() returns.
+
−     * Both threads set thred->id while holding pt_book.ml and
+
−     * use thred->idSet to ensure thred->id is written only once.
+
−     */
+
−    if (!thred->idSet)
+
−    {
+
−        thred->id = id;
+
−        thred->idSet = PR_TRUE;
+
−    }
+
−    else
+
−    {
+
−        PR_ASSERT(pthread_equal(thred->id, id));
+
−    }
+
−
+
−#ifdef _PR_NICE_PRIORITY_SCHEDULING
+
−    thred->tid = tid;
+
−    PR_NotifyAllCondVar(pt_book.cv);
+
−#endif
+
−
+
−    /* If this is a GCABLE thread, set its state appropriately */
+
−    if (thred->suspend & PT_THREAD_SETGCABLE)
+
−	    thred->state |= PT_THREAD_GCABLE;
+
−    thred->suspend = 0;
+
−
+
−    thred->prev = pt_book.last;
+
−    if (pt_book.last)
+
−        pt_book.last->next = thred;
+
−    else
+
−        pt_book.first = thred;
+
−    thred->next = NULL;
+
−    pt_book.last = thred;
+
−    PR_Unlock(pt_book.ml);
+
−
+
−    thred->startFunc(thred->arg);  /* make visible to the client */
+
−
+
−    /* unhook the thread from the runtime */
+
−    PR_Lock(pt_book.ml);
+
−    /*
+
−     * At this moment, PR_CreateThread() may not have set thred->id yet.
+
−     * It is safe for a detached thread to free thred only after
+
−     * PR_CreateThread() has accessed thred->id and thred->idSet.
+
−     */
+
−    if (detached)
+
−    {
+
−        while (!thred->okToDelete)
+
−            PR_WaitCondVar(pt_book.cv, PR_INTERVAL_NO_TIMEOUT);
+
−    }
+
−
+
−    if (thred->state & PT_THREAD_SYSTEM)
+
−        pt_book.system -= 1;
+
−    else if (--pt_book.user == pt_book.this_many)
+
−        PR_NotifyAllCondVar(pt_book.cv);
+
−    if (NULL == thred->prev)
+
−        pt_book.first = thred->next;
+
−    else
+
−        thred->prev->next = thred->next;
+
−    if (NULL == thred->next)
+
−        pt_book.last = thred->prev;
+
−    else
+
−        thred->next->prev = thred->prev;
+
−    PR_Unlock(pt_book.ml);
+
−
+
−    /*
+
−    * Here we set the pthread's backpointer to the PRThread to NULL.
+
−    * Otherwise the destructor would get called eagerly as the thread
+
−    * returns to the pthread runtime. The joining thread would them be
+
−    * the proud possessor of a dangling reference. However, this is the
+
−    * last chance to delete the object if the thread is detached, so
+
−    * just let the destructor do the work.
+
−    */
+
−    if (PR_FALSE == detached)
+
−    {
+
−        /* Call TPD destructors on this thread. */
+
−        _PR_DestroyThreadPrivate(thred);
+
−        rv = pthread_setspecific(pt_book.key, NULL);
+
−        PR_ASSERT(0 == rv);
+
−    }
+
−
+
−    return NULL;
+
−}  /* _pt_root */
+
−
+
−static PRThread* pt_AttachThread(void)
+
−{
+
−    PRThread *thred = NULL;
+
−
+
−    /*
+
−     * NSPR must have been initialized when PR_AttachThread is called.
+
−     * We cannot have PR_AttachThread call implicit initialization
+
−     * because if multiple threads call PR_AttachThread simultaneously,
+
−     * NSPR may be initialized more than once.
+
−     * We can't call any function that calls PR_GetCurrentThread()
+
−     * either (e.g., PR_SetError()) as that will result in infinite
+
−     * recursion.
+
−     */
+
−    if (!_pr_initialized) return NULL;
+
−
+
−    /* PR_NEWZAP must not call PR_GetCurrentThread() */
+
−    thred = PR_NEWZAP(PRThread);
+
−    if (NULL != thred)
+
−    {
+
−        int rv;
+
−
+
−        thred->priority = PR_PRIORITY_NORMAL;
+
−        thred->id = pthread_self();
+
−        thred->idSet = PR_TRUE;
+
−#ifdef _PR_NICE_PRIORITY_SCHEDULING
+
−        thred->tid = gettid();
+
−#endif
+
−        rv = pthread_setspecific(pt_book.key, thred);
+
−        PR_ASSERT(0 == rv);
+
−
+
−        thred->state = PT_THREAD_GLOBAL | PT_THREAD_FOREIGN;
+
−        PR_Lock(pt_book.ml);
+
−
+
−        /* then put it into the list */
+
−        thred->prev = pt_book.last;
+
−        if (pt_book.last)
+
−            pt_book.last->next = thred;
+
−        else
+
−            pt_book.first = thred;
+
−        thred->next = NULL;
+
−        pt_book.last = thred;
+
−        PR_Unlock(pt_book.ml);
+
−
+
−    }
+
−    return thred;  /* may be NULL */
+
−}  /* pt_AttachThread */
+
−
+
−static PRThread* _PR_CreateThread(
+
−    PRThreadType type, void (*start)(void *arg),
+
−    void *arg, PRThreadPriority priority, PRThreadScope scope,
+
−    PRThreadState state, PRUint32 stackSize, PRBool isGCAble)
+
−{
+
−    int rv;
+
−    PRThread *thred;
+
−    pthread_attr_t tattr;
+
−
+
−    if (!_pr_initialized) _PR_ImplicitInitialization();
+
−
+
−    if ((PRIntn)PR_PRIORITY_FIRST > (PRIntn)priority)
+
−        priority = PR_PRIORITY_FIRST;
+
−    else if ((PRIntn)PR_PRIORITY_LAST < (PRIntn)priority)
+
−        priority = PR_PRIORITY_LAST;
+
−
+
−    rv = _PT_PTHREAD_ATTR_INIT(&tattr);
+
−    PR_ASSERT(0 == rv);
+
−
+
−    if (EPERM != pt_schedpriv)
+
−    {
+
−#if !defined(_PR_DCETHREADS) && _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+
−        struct sched_param schedule;
+
−#endif
+
−
+
−#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+
−        rv = pthread_attr_setinheritsched(&tattr, PTHREAD_EXPLICIT_SCHED);
+
−        PR_ASSERT(0 == rv);
+
−#endif
+
−
+
−        /* Use the default scheduling policy */
+
−
+
−#if defined(_PR_DCETHREADS)
+
−        rv = pthread_attr_setprio(&tattr, pt_PriorityMap(priority));
+
−        PR_ASSERT(0 == rv);
+
−#elif _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+
−        rv = pthread_attr_getschedparam(&tattr, &schedule);
+
−        PR_ASSERT(0 == rv);
+
−        schedule.sched_priority = pt_PriorityMap(priority);
+
−        rv = pthread_attr_setschedparam(&tattr, &schedule);
+
−        PR_ASSERT(0 == rv);
+
−#ifdef NTO
+
−        rv = pthread_attr_setschedpolicy(&tattr, SCHED_RR); /* Round Robin */
+
−        PR_ASSERT(0 == rv);
+
−#endif
+
−#endif /* !defined(_PR_DCETHREADS) */
+
−    }
+
−
+
−    /*
+
−     * DCE threads can't set detach state before creating the thread.
+
−     * AIX can't set detach late. Why can't we all just get along?
+
−     */
+
−#if !defined(_PR_DCETHREADS)
+
−    rv = pthread_attr_setdetachstate(&tattr,
+
−        ((PR_JOINABLE_THREAD == state) ?
+
−            PTHREAD_CREATE_JOINABLE : PTHREAD_CREATE_DETACHED));
+
−    PR_ASSERT(0 == rv);
+
−#endif /* !defined(_PR_DCETHREADS) */
+
−
+
−    /*
+
−     * If stackSize is 0, we use the default pthread stack size.
+
−     */
+
−    if (stackSize)
+
−    {
+
−#ifdef _MD_MINIMUM_STACK_SIZE
+
−        if (stackSize < _MD_MINIMUM_STACK_SIZE)
+
−            stackSize = _MD_MINIMUM_STACK_SIZE;
+
−#endif
+
−        rv = pthread_attr_setstacksize(&tattr, stackSize);
+
−        PR_ASSERT(0 == rv);
+
−    }
+
−
+
−    thred = PR_NEWZAP(PRThread);
+
−    if (NULL == thred)
+
−    {
+
−        PR_SetError(PR_OUT_OF_MEMORY_ERROR, errno);
+
−        goto done;
+
−    }
+
−    else
+
−    {
+
−        pthread_t id;
+
−
+
−        thred->arg = arg;
+
−        thred->startFunc = start;
+
−        thred->priority = priority;
+
−        if (PR_UNJOINABLE_THREAD == state)
+
−            thred->state |= PT_THREAD_DETACHED;
+
−
+
−        if (PR_LOCAL_THREAD == scope)
+
−        	scope = PR_GLOBAL_THREAD;
+
−			
+
−        if (PR_GLOBAL_BOUND_THREAD == scope) {
+
−#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+
−    		rv = pthread_attr_setscope(&tattr, PTHREAD_SCOPE_SYSTEM);
+
−			if (rv) {
+
−				/*
+
−				 * system scope not supported
+
−				 */
+
−        		scope = PR_GLOBAL_THREAD;
+
−				/*
+
−				 * reset scope
+
−				 */
+
−    			rv = pthread_attr_setscope(&tattr, PTHREAD_SCOPE_PROCESS);
+
−    			PR_ASSERT(0 == rv);
+
−			}
+
−#endif
+
−		}
+
−        if (PR_GLOBAL_THREAD == scope)
+
−            thred->state |= PT_THREAD_GLOBAL;
+
−        else if (PR_GLOBAL_BOUND_THREAD == scope)
+
−            thred->state |= (PT_THREAD_GLOBAL | PT_THREAD_BOUND);
+
−		else	/* force it global */
+
−            thred->state |= PT_THREAD_GLOBAL;
+
−        if (PR_SYSTEM_THREAD == type)
+
−            thred->state |= PT_THREAD_SYSTEM;
+
−
+
−        thred->suspend =(isGCAble) ? PT_THREAD_SETGCABLE : 0;
+
−
+
−        thred->stack = PR_NEWZAP(PRThreadStack);
+
−        if (thred->stack == NULL) {
+
−            PRIntn oserr = errno;
+
−            PR_Free(thred);  /* all that work ... poof! */
+
−            PR_SetError(PR_OUT_OF_MEMORY_ERROR, oserr);
+
−            thred = NULL;  /* and for what? */
+
−            goto done;
+
−        }
+
−        thred->stack->stackSize = stackSize;
+
−        thred->stack->thr = thred;
+
−
+
−#ifdef PT_NO_SIGTIMEDWAIT
+
−        pthread_mutex_init(&thred->suspendResumeMutex,NULL);
+
−        pthread_cond_init(&thred->suspendResumeCV,NULL);
+
−#endif
+
−
+
−        /* make the thread counted to the rest of the runtime */
+
−        PR_Lock(pt_book.ml);
+
−        if (PR_SYSTEM_THREAD == type)
+
−            pt_book.system += 1;
+
−        else pt_book.user += 1;
+
−        PR_Unlock(pt_book.ml);
+
−
+
−        /*
+
−         * We pass a pointer to a local copy (instead of thred->id)
+
−         * to pthread_create() because who knows what wacky things
+
−         * pthread_create() may be doing to its argument.
+
−         */
+
−        rv = _PT_PTHREAD_CREATE(&id, tattr, _pt_root, thred);
+
−
+
−#if !defined(_PR_DCETHREADS)
+
−        if (EPERM == rv)
+
−        {
+
−#if defined(IRIX)
+
−        	if (PR_GLOBAL_BOUND_THREAD == scope) {
+
−				/*
+
−				 * SCOPE_SYSTEM requires appropriate privilege
+
−				 * reset to process scope and try again
+
−				 */
+
−    			rv = pthread_attr_setscope(&tattr, PTHREAD_SCOPE_PROCESS);
+
−    			PR_ASSERT(0 == rv);
+
−            	thred->state &= ~PT_THREAD_BOUND;
+
−			}
+
−#else
+
−            /* Remember that we don't have thread scheduling privilege. */
+
−            pt_schedpriv = EPERM;
+
−            PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+
−                ("_PR_CreateThread: no thread scheduling privilege"));
+
−            /* Try creating the thread again without setting priority. */
+
−#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+
−            rv = pthread_attr_setinheritsched(&tattr, PTHREAD_INHERIT_SCHED);
+
−            PR_ASSERT(0 == rv);
+
−#endif
+
−#endif	/* IRIX */
+
−            rv = _PT_PTHREAD_CREATE(&id, tattr, _pt_root, thred);
+
−        }
+
−#endif
+
−
+
−        if (0 != rv)
+
−        {
+
−#if defined(_PR_DCETHREADS)
+
−            PRIntn oserr = errno;
+
−#else
+
−            PRIntn oserr = rv;
+
−#endif
+
−            PR_Lock(pt_book.ml);
+
−            if (thred->state & PT_THREAD_SYSTEM)
+
−                pt_book.system -= 1;
+
−            else if (--pt_book.user == pt_book.this_many)
+
−                PR_NotifyAllCondVar(pt_book.cv);
+
−            PR_Unlock(pt_book.ml);
+
−
+
−            PR_Free(thred->stack);
+
−            PR_Free(thred);  /* all that work ... poof! */
+
−            PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, oserr);
+
−            thred = NULL;  /* and for what? */
+
−            goto done;
+
−        }
+
−
+
−        PR_Lock(pt_book.ml);
+
−        /*
+
−         * Both the parent thread and this new thread set thred->id.
+
−         * The parent thread must ensure that thred->id is set before
+
−         * PR_CreateThread() returns.  (See comments in _pt_root().)
+
−         */
+
−        if (!thred->idSet)
+
−        {
+
−            thred->id = id;
+
−            thred->idSet = PR_TRUE;
+
−        }
+
−        else
+
−        {
+
−            PR_ASSERT(pthread_equal(thred->id, id));
+
−        }
+
−
+
−        /*
+
−         * If the new thread is detached, tell it that PR_CreateThread() has
+
−         * accessed thred->id and thred->idSet so it's ok to delete thred.
+
−         */
+
−        if (PR_UNJOINABLE_THREAD == state)
+
−        {
+
−            thred->okToDelete = PR_TRUE;
+
−            PR_NotifyAllCondVar(pt_book.cv);
+
−        }
+
−        PR_Unlock(pt_book.ml);
+
−    }
+
−
+
−done:
+
−    rv = _PT_PTHREAD_ATTR_DESTROY(&tattr);
+
−    PR_ASSERT(0 == rv);
+
−
+
−    return thred;
+
−}  /* _PR_CreateThread */
+
−
+
−PR_IMPLEMENT(PRThread*) PR_CreateThread(
+
−    PRThreadType type, void (*start)(void *arg), void *arg,
+
−    PRThreadPriority priority, PRThreadScope scope,
+
−    PRThreadState state, PRUint32 stackSize)
+
−{
+
−    return _PR_CreateThread(
+
−        type, start, arg, priority, scope, state, stackSize, PR_FALSE);
+
−} /* PR_CreateThread */
+
−
+
−PR_IMPLEMENT(PRThread*) PR_CreateThreadGCAble(
+
−    PRThreadType type, void (*start)(void *arg), void *arg, 
+
−    PRThreadPriority priority, PRThreadScope scope,
+
−    PRThreadState state, PRUint32 stackSize)
+
−{
+
−    return _PR_CreateThread(
+
−        type, start, arg, priority, scope, state, stackSize, PR_TRUE);
+
−}  /* PR_CreateThreadGCAble */
+
−
+
−PR_IMPLEMENT(void*) GetExecutionEnvironment(PRThread *thred)
+
−{
+
−    return thred->environment;
+
−}  /* GetExecutionEnvironment */
+
− 
+
−PR_IMPLEMENT(void) SetExecutionEnvironment(PRThread *thred, void *env)
+
−{
+
−    thred->environment = env;
+
−}  /* SetExecutionEnvironment */
+
−
+
−PR_IMPLEMENT(PRThread*) PR_AttachThread(
+
−    PRThreadType type, PRThreadPriority priority, PRThreadStack *stack)
+
−{
+
−    return PR_GetCurrentThread();
+
−}  /* PR_AttachThread */
+
−
+
−
+
−PR_IMPLEMENT(PRStatus) PR_JoinThread(PRThread *thred)
+
−{
+
−    int rv = -1;
+
−    void *result = NULL;
+
−    PR_ASSERT(thred != NULL);
+
−
+
−    if ((0xafafafaf == thred->state)
+
−    || (PT_THREAD_DETACHED == (PT_THREAD_DETACHED & thred->state))
+
−    || (PT_THREAD_FOREIGN == (PT_THREAD_FOREIGN & thred->state)))
+
−    {
+
−        /*
+
−         * This might be a bad address, but if it isn't, the state should
+
−         * either be an unjoinable thread or it's already had the object
+
−         * deleted. However, the client that called join on a detached
+
−         * thread deserves all the rath I can muster....
+
−         */
+
−        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+
−        PR_LogPrint(
+
−            "PR_JoinThread: %p not joinable | already smashed\n", thred);
+
−    }
+
−    else
+
−    {
+
−        pthread_t id = thred->id;
+
−        rv = pthread_join(id, &result);
+
−        PR_ASSERT(rv == 0 && result == NULL);
+
−        if (0 == rv)
+
−        {
+
−#ifdef _PR_DCETHREADS
+
−            rv = pthread_detach(&id);
+
−            PR_ASSERT(0 == rv);
+
−#endif
+
−            /*
+
−             * PR_FALSE, because the thread already called the TPD
+
−             * destructors before exiting _pt_root.
+
−             */
+
−            _pt_thread_death_internal(thred, PR_FALSE);
+
−        }
+
−        else
+
−        {
+
−            PRErrorCode prerror;
+
−            switch (rv)
+
−            {
+
−                case EINVAL:  /* not a joinable thread */
+
−                case ESRCH:   /* no thread with given ID */
+
−                    prerror = PR_INVALID_ARGUMENT_ERROR;
+
−                    break;
+
−                case EDEADLK: /* a thread joining with itself */
+
−                    prerror = PR_DEADLOCK_ERROR;
+
−                    break;
+
−                default:
+
−                    prerror = PR_UNKNOWN_ERROR;
+
−                    break;
+
−            }
+
−            PR_SetError(prerror, rv);
+
−        }
+
−    }
+
−    return (0 == rv) ? PR_SUCCESS : PR_FAILURE;
+
−}  /* PR_JoinThread */
+
−
+
−PR_IMPLEMENT(void) PR_DetachThread(void)
+
−{
+
−    void *thred;
+
−    int rv;
+
−
+
−    _PT_PTHREAD_GETSPECIFIC(pt_book.key, thred);
+
−    if (NULL == thred) return;
+
−    _pt_thread_death(thred);
+
−    rv = pthread_setspecific(pt_book.key, NULL);
+
−    PR_ASSERT(0 == rv);
+
−}  /* PR_DetachThread */
+
−
+
−PR_IMPLEMENT(PRThread*) PR_GetCurrentThread(void)
+
−{
+
−    void *thred;
+
−
+
−    if (!_pr_initialized) _PR_ImplicitInitialization();
+
−
+
−    _PT_PTHREAD_GETSPECIFIC(pt_book.key, thred);
+
−    if (NULL == thred) thred = pt_AttachThread();
+
−    PR_ASSERT(NULL != thred);
+
−    return (PRThread*)thred;
+
−}  /* PR_GetCurrentThread */
+
−
+
−PR_IMPLEMENT(PRThreadScope) PR_GetThreadScope(const PRThread *thred)
+
−{
+
−    return (thred->state & PT_THREAD_BOUND) ?
+
−        PR_GLOBAL_BOUND_THREAD : PR_GLOBAL_THREAD;
+
−}  /* PR_GetThreadScope() */
+
−
+
−PR_IMPLEMENT(PRThreadType) PR_GetThreadType(const PRThread *thred)
+
−{
+
−    return (thred->state & PT_THREAD_SYSTEM) ?
+
−        PR_SYSTEM_THREAD : PR_USER_THREAD;
+
−}
+
−
+
−PR_IMPLEMENT(PRThreadState) PR_GetThreadState(const PRThread *thred)
+
−{
+
−    return (thred->state & PT_THREAD_DETACHED) ?
+
−        PR_UNJOINABLE_THREAD : PR_JOINABLE_THREAD;
+
−}  /* PR_GetThreadState */
+
−
+
−PR_IMPLEMENT(PRThreadPriority) PR_GetThreadPriority(const PRThread *thred)
+
−{
+
−    PR_ASSERT(thred != NULL);
+
−    return thred->priority;
+
−}  /* PR_GetThreadPriority */
+
−
+
−PR_IMPLEMENT(void) PR_SetThreadPriority(PRThread *thred, PRThreadPriority newPri)
+
−{
+
−    PRIntn rv;
+
−
+
−    PR_ASSERT(NULL != thred);
+
−
+
−    if ((PRIntn)PR_PRIORITY_FIRST > (PRIntn)newPri)
+
−        newPri = PR_PRIORITY_FIRST;
+
−    else if ((PRIntn)PR_PRIORITY_LAST < (PRIntn)newPri)
+
−        newPri = PR_PRIORITY_LAST;
+
−
+
−#if defined(_PR_DCETHREADS)
+
−    rv = pthread_setprio(thred->id, pt_PriorityMap(newPri));
+
−    /* pthread_setprio returns the old priority */
+
−#elif _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+
−    if (EPERM != pt_schedpriv)
+
−    {
+
−        int policy;
+
−        struct sched_param schedule;
+
−
+
−        rv = pthread_getschedparam(thred->id, &policy, &schedule);
+
−        if(0 == rv) {
+
−			schedule.sched_priority = pt_PriorityMap(newPri);
+
−			rv = pthread_setschedparam(thred->id, policy, &schedule);
+
−			if (EPERM == rv)
+
−			{
+
−				pt_schedpriv = EPERM;
+
−				PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+
−					("PR_SetThreadPriority: no thread scheduling privilege"));
+
−			}
+
−		}
+
−		if (rv != 0)
+
−			rv = -1;
+
−    }
+
−#elif defined(_PR_NICE_PRIORITY_SCHEDULING)
+
−    PR_Lock(pt_book.ml);
+
−    while (thred->tid == 0)
+
−        PR_WaitCondVar(pt_book.cv, PR_INTERVAL_NO_TIMEOUT);
+
−    PR_Unlock(pt_book.ml);
+
−
+
−    errno = 0;
+
−    rv = getpriority(PRIO_PROCESS, 0);
+
−
+
−    /* Do not proceed unless we know the main thread's nice value. */
+
−    if (errno == 0) {
+
−        rv = setpriority(PRIO_PROCESS, thred->tid,
+
−                         pt_RelativePriority(rv, newPri));
+
−
+
−        if (rv == -1)
+
−        {
+
−            /* We don't set pt_schedpriv to EPERM in case errno == EPERM
+
−             * because adjusting the nice value might be permitted for certain
+
−             * ranges but not for others. */
+
−            PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+
−                ("PR_SetThreadPriority: setpriority failed with error %d",
+
−                 errno));
+
−        }
+
−    }
+
−#else
+
−    (void)rv; /* rv is unused */
+
−#endif
+
−
+
−    thred->priority = newPri;
+
−}  /* PR_SetThreadPriority */
+
−
+
−PR_IMPLEMENT(PRStatus) PR_Interrupt(PRThread *thred)
+
−{
+
−    /*
+
−    ** If the target thread indicates that it's waiting,
+
−    ** find the condition and broadcast to it. Broadcast
+
−    ** since we don't know which thread (if there are more
+
−    ** than one). This sounds risky, but clients must
+
−    ** test their invariants when resumed from a wait and
+
−    ** I don't expect very many threads to be waiting on
+
−    ** a single condition and I don't expect interrupt to
+
−    ** be used very often.
+
−    **
+
−    ** I don't know why I thought this would work. Must have
+
−    ** been one of those weaker momements after I'd been
+
−    ** smelling the vapors.
+
−    **
+
−    ** Even with the followng changes it is possible that
+
−    ** the pointer to the condition variable is pointing
+
−    ** at a bogus value. Will the unerlying code detect
+
−    ** that?
+
−    */
+
−    PRCondVar *cv;
+
−    PR_ASSERT(NULL != thred);
+
−    if (NULL == thred) return PR_FAILURE;
+
−
+
−    thred->state |= PT_THREAD_ABORTED;
+
−
+
−    cv = thred->waiting;
+
−    if ((NULL != cv) && !thred->interrupt_blocked)
+
−    {
+
−        PRIntn rv;
+
−        (void)PR_ATOMIC_INCREMENT(&cv->notify_pending);
+
−        rv = pthread_cond_broadcast(&cv->cv);
+
−        PR_ASSERT(0 == rv);
+
−        if (0 > PR_ATOMIC_DECREMENT(&cv->notify_pending))
+
−            PR_DestroyCondVar(cv);
+
−    }
+
−    return PR_SUCCESS;
+
−}  /* PR_Interrupt */
+
−
+
−PR_IMPLEMENT(void) PR_ClearInterrupt(void)
+
−{
+
−    PRThread *me = PR_GetCurrentThread();
+
−    me->state &= ~PT_THREAD_ABORTED;
+
−}  /* PR_ClearInterrupt */
+
−
+
−PR_IMPLEMENT(void) PR_BlockInterrupt(void)
+
−{
+
−    PRThread *me = PR_GetCurrentThread();
+
−    _PT_THREAD_BLOCK_INTERRUPT(me);
+
−}  /* PR_BlockInterrupt */
+
−
+
−PR_IMPLEMENT(void) PR_UnblockInterrupt(void)
+
−{
+
−    PRThread *me = PR_GetCurrentThread();
+
−    _PT_THREAD_UNBLOCK_INTERRUPT(me);
+
−}  /* PR_UnblockInterrupt */
+
−
+
−PR_IMPLEMENT(PRStatus) PR_Yield(void)
+
−{
+
−    static PRBool warning = PR_TRUE;
+
−    if (warning) warning = _PR_Obsolete(
+
−        "PR_Yield()", "PR_Sleep(PR_INTERVAL_NO_WAIT)");
+
−    return PR_Sleep(PR_INTERVAL_NO_WAIT);
+
−}
+
−
+
−PR_IMPLEMENT(PRStatus) PR_Sleep(PRIntervalTime ticks)
+
−{
+
−    PRStatus rv = PR_SUCCESS;
+
−
+
−    if (!_pr_initialized) _PR_ImplicitInitialization();
+
−
+
−    if (PR_INTERVAL_NO_WAIT == ticks)
+
−    {
+
−        _PT_PTHREAD_YIELD();
+
−    }
+
−    else
+
−    {
+
−        PRCondVar *cv;
+
−        PRIntervalTime timein;
+
−
+
−        timein = PR_IntervalNow();
+
−        cv = PR_NewCondVar(_pr_sleeplock);
+
−        PR_ASSERT(cv != NULL);
+
−        PR_Lock(_pr_sleeplock);
+
−        do
+
−        {
+
−            PRIntervalTime now = PR_IntervalNow();
+
−            PRIntervalTime delta = now - timein;
+
−            if (delta > ticks) break;
+
−            rv = PR_WaitCondVar(cv, ticks - delta);
+
−        } while (PR_SUCCESS == rv);
+
−        PR_Unlock(_pr_sleeplock);
+
−        PR_DestroyCondVar(cv);
+
−    }
+
−    return rv;
+
−}  /* PR_Sleep */
+
−
+
−static void _pt_thread_death(void *arg)
+
−{
+
−    void *thred;
+
−    int rv;
+
−
+
−    _PT_PTHREAD_GETSPECIFIC(pt_book.key, thred);
+
−    if (NULL == thred)
+
−    {
+
−        /*
+
−         * Have PR_GetCurrentThread return the expected value to the
+
−         * destructors.
+
−         */
+
−        rv = pthread_setspecific(pt_book.key, arg);
+
−        PR_ASSERT(0 == rv);
+
−    }
+
−
+
−    /* PR_TRUE for: call destructors */ 
+
−    _pt_thread_death_internal(arg, PR_TRUE);
+
−
+
−    if (NULL == thred)
+
−    {
+
−        rv = pthread_setspecific(pt_book.key, NULL);
+
−        PR_ASSERT(0 == rv);
+
−    }
+
−}
+
−
+
−static void _pt_thread_death_internal(void *arg, PRBool callDestructors)
+
−{
+
−    PRThread *thred = (PRThread*)arg;
+
−
+
−    if (thred->state & (PT_THREAD_FOREIGN|PT_THREAD_PRIMORD))
+
−    {
+
−        PR_Lock(pt_book.ml);
+
−        if (NULL == thred->prev)
+
−            pt_book.first = thred->next;
+
−        else
+
−            thred->prev->next = thred->next;
+
−        if (NULL == thred->next)
+
−            pt_book.last = thred->prev;
+
−        else
+
−            thred->next->prev = thred->prev;
+
−        PR_Unlock(pt_book.ml);
+
−    }
+
−    if (callDestructors)
+
−        _PR_DestroyThreadPrivate(thred);
+
−    PR_Free(thred->privateData);
+
−    if (NULL != thred->errorString)
+
−        PR_Free(thred->errorString);
+
−    if (NULL != thred->name)
+
−        PR_Free(thred->name);
+
−    PR_Free(thred->stack);
+
−    if (NULL != thred->syspoll_list)
+
−        PR_Free(thred->syspoll_list);
+
−#if defined(_PR_POLL_WITH_SELECT)
+
−    if (NULL != thred->selectfd_list)
+
−        PR_Free(thred->selectfd_list);
+
−#endif
+
−#if defined(DEBUG)
+
−    memset(thred, 0xaf, sizeof(PRThread));
+
−#endif /* defined(DEBUG) */
+
−    PR_Free(thred);
+
−}  /* _pt_thread_death */
+
−
+
−void _PR_InitThreads(
+
−    PRThreadType type, PRThreadPriority priority, PRUintn maxPTDs)
+
−{
+
−    int rv;
+
−    PRThread *thred;
+
−
+
−    PR_ASSERT(priority == PR_PRIORITY_NORMAL);
+
−
+
−#ifdef _PR_NEED_PTHREAD_INIT
+
−    /*
+
−     * On BSD/OS (3.1 and 4.0), the pthread subsystem is lazily
+
−     * initialized, but pthread_self() fails to initialize
+
−     * pthreads and hence returns a null thread ID if invoked
+
−     * by the primordial thread before any other pthread call.
+
−     * So we explicitly initialize pthreads here.
+
−     */
+
−    pthread_init();
+
−#endif
+
−
+
−#if defined(_PR_DCETHREADS) || _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+
−#if defined(FREEBSD)
+
−    {
+
−    pthread_attr_t attr;
+
−    int policy;
+
−    /* get the min and max priorities of the default policy */
+
−    pthread_attr_init(&attr);
+
−    pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED);
+
−    pthread_attr_getschedpolicy(&attr, &policy);
+
−    pt_book.minPrio = sched_get_priority_min(policy);
+
−    PR_ASSERT(-1 != pt_book.minPrio);
+
−    pt_book.maxPrio = sched_get_priority_max(policy);
+
−    PR_ASSERT(-1 != pt_book.maxPrio);
+
−    pthread_attr_destroy(&attr);
+
−    }
+
−#else
+
−    /*
+
−    ** These might be function evaluations
+
−    */
+
−    pt_book.minPrio = PT_PRIO_MIN;
+
−    pt_book.maxPrio = PT_PRIO_MAX;
+
−#endif
+
−#endif
+
−    
+
−    PR_ASSERT(NULL == pt_book.ml);
+
−    pt_book.ml = PR_NewLock();
+
−    PR_ASSERT(NULL != pt_book.ml);
+
−    pt_book.cv = PR_NewCondVar(pt_book.ml);
+
−    PR_ASSERT(NULL != pt_book.cv);
+
−    thred = PR_NEWZAP(PRThread);
+
−    PR_ASSERT(NULL != thred);
+
−    thred->arg = NULL;
+
−    thred->startFunc = NULL;
+
−    thred->priority = priority;
+
−    thred->id = pthread_self();
+
−    thred->idSet = PR_TRUE;
+
−#ifdef _PR_NICE_PRIORITY_SCHEDULING
+
−    thred->tid = gettid();
+
−#endif
+
−
+
−    thred->state = (PT_THREAD_DETACHED | PT_THREAD_PRIMORD);
+
−    if (PR_SYSTEM_THREAD == type)
+
−    {
+
−        thred->state |= PT_THREAD_SYSTEM;
+
−        pt_book.system += 1;
+
−	    pt_book.this_many = 0;
+
−    }
+
−    else
+
−    {
+
−	    pt_book.user += 1;
+
−	    pt_book.this_many = 1;
+
−    }
+
−    thred->next = thred->prev = NULL;
+
−    pt_book.first = pt_book.last = thred;
+
−
+
−    thred->stack = PR_NEWZAP(PRThreadStack);
+
−    PR_ASSERT(thred->stack != NULL);
+
−    thred->stack->stackSize = 0;
+
−    thred->stack->thr = thred;
+
−	_PR_InitializeStack(thred->stack);
+
−
+
−    /*
+
−     * Create a key for our use to store a backpointer in the pthread
+
−     * to our PRThread object. This object gets deleted when the thread
+
−     * returns from its root in the case of a detached thread. Other
+
−     * threads delete the objects in Join.
+
−     *
+
−     * NB: The destructor logic seems to have a bug so it isn't used.
+
−     * NBB: Oh really? I'm going to give it a spin - AOF 19 June 1998.
+
−     * More info - the problem is that pthreads calls the destructor
+
−     * eagerly as the thread returns from its root, rather than lazily
+
−     * after the thread is joined. Therefore, threads that are joining
+
−     * and holding PRThread references are actually holding pointers to
+
−     * nothing.
+
−     */
+
−    rv = _PT_PTHREAD_KEY_CREATE(&pt_book.key, _pt_thread_death);
+
−    if (0 != rv)
+
−        PR_Assert("0 == rv", __FILE__, __LINE__);
+
−    pt_book.keyCreated = PR_TRUE;
+
−    rv = pthread_setspecific(pt_book.key, thred);
+
−    PR_ASSERT(0 == rv);
+
−}  /* _PR_InitThreads */
+
−
+
−#ifdef __GNUC__
+
−/*
+
− * GCC supports the constructor and destructor attributes as of
+
− * version 2.5.
+
− */
+
−static void _PR_Fini(void) __attribute__ ((destructor));
+
−#elif defined(__SUNPRO_C)
+
−/*
+
− * Sun Studio compiler
+
− */
+
−#pragma fini(_PR_Fini)
+
−static void _PR_Fini(void);
+
−#elif defined(HPUX)
+
−/*
+
− * Current versions of HP C compiler define __HP_cc.
+
− * HP C compiler A.11.01.20 doesn't define __HP_cc.
+
− */
+
−#if defined(__ia64) || defined(_LP64)
+
−#pragma FINI "_PR_Fini"
+
−static void _PR_Fini(void);
+
−#else
+
−/*
+
− * Only HP-UX 10.x style initializers are supported in 32-bit links.
+
− * Need to use the +I PR_HPUX10xInit linker option.
+
− */
+
−#include <dl.h>
+
−
+
−static void _PR_Fini(void);
+
−
+
−void PR_HPUX10xInit(shl_t handle, int loading)
+
−{
+
−    /*
+
−     * This function is called when a shared library is loaded as well
+
−     * as when the shared library is unloaded.  Note that it may not
+
−     * be called when the user's program terminates.
+
−     *
+
−     * handle is the shl_load API handle for the shared library being
+
−     * initialized.
+
−     *
+
−     * loading is non-zero at startup and zero at termination.
+
−     */
+
−    if (loading) {
+
−	/* ... do some initializations ... */
+
−    } else {
+
−	_PR_Fini();
+
−    }
+
−}
+
−#endif
+
−#elif defined(AIX)
+
−/* Need to use the -binitfini::_PR_Fini linker option. */
+
−#endif
+
−
+
−void _PR_Fini(void)
+
−{
+
−    void *thred;
+
−    int rv;
+
−
+
−    if (!_pr_initialized) {
+
−        /* Either NSPR was never successfully initialized or 
+
−         * PR_Cleanup has been called already. */
+
−        if (pt_book.keyCreated)
+
−        {
+
−            rv = pthread_key_delete(pt_book.key);
+
−            PR_ASSERT(0 == rv);
+
−            pt_book.keyCreated = PR_FALSE;
+
−        }
+
−        return;
+
−    }
+
−
+
−    _PT_PTHREAD_GETSPECIFIC(pt_book.key, thred);
+
−    if (NULL != thred)
+
−    {
+
−        /*
+
−         * PR_FALSE, because it is unsafe to call back to the 
+
−         * thread private data destructors at final cleanup.
+
−         */
+
−        _pt_thread_death_internal(thred, PR_FALSE);
+
−        rv = pthread_setspecific(pt_book.key, NULL);
+
−        PR_ASSERT(0 == rv);
+
−    }
+
−    rv = pthread_key_delete(pt_book.key);
+
−    PR_ASSERT(0 == rv);
+
−    pt_book.keyCreated = PR_FALSE;
+
−    /* TODO: free other resources used by NSPR */
+
−    /* _pr_initialized = PR_FALSE; */
+
−}  /* _PR_Fini */
+
−
+
−PR_IMPLEMENT(PRStatus) PR_Cleanup(void)
+
−{
+
−    PRThread *me = PR_GetCurrentThread();
+
−    int rv;
+
−    PR_LOG(_pr_thread_lm, PR_LOG_MIN, ("PR_Cleanup: shutting down NSPR"));
+
−    PR_ASSERT(me->state & PT_THREAD_PRIMORD);
+
−    if (me->state & PT_THREAD_PRIMORD)
+
−    {
+
−        PR_Lock(pt_book.ml);
+
−        while (pt_book.user > pt_book.this_many)
+
−            PR_WaitCondVar(pt_book.cv, PR_INTERVAL_NO_TIMEOUT);
+
−        if (me->state & PT_THREAD_SYSTEM)
+
−            pt_book.system -= 1;
+
−        else
+
−            pt_book.user -= 1;
+
−        PR_Unlock(pt_book.ml);
+
−
+
−        _PR_MD_EARLY_CLEANUP();
+
−
+
−        _PR_CleanupMW();
+
−        _PR_CleanupTime();
+
−        _PR_CleanupDtoa();
+
−        _PR_CleanupCallOnce();
+
−        _PR_ShutdownLinker();
+
−        _PR_LogCleanup();
+
−        _PR_CleanupNet();
+
−        /* Close all the fd's before calling _PR_CleanupIO */
+
−        _PR_CleanupIO();
+
−        _PR_CleanupCMon();
+
−
+
−        _pt_thread_death(me);
+
−        rv = pthread_setspecific(pt_book.key, NULL);
+
−        PR_ASSERT(0 == rv);
+
−        /*
+
−         * I am not sure if it's safe to delete the cv and lock here,
+
−         * since there may still be "system" threads around. If this
+
−         * call isn't immediately prior to exiting, then there's a
+
−         * problem.
+
−         */
+
−        if (0 == pt_book.system)
+
−        {
+
−            PR_DestroyCondVar(pt_book.cv); pt_book.cv = NULL;
+
−            PR_DestroyLock(pt_book.ml); pt_book.ml = NULL;
+
−        }
+
−        PR_DestroyLock(_pr_sleeplock);
+
−        _pr_sleeplock = NULL;
+
−        _PR_CleanupLayerCache();
+
−        _PR_CleanupEnv();
+
−#ifdef _PR_ZONE_ALLOCATOR
+
−        _PR_DestroyZones();
+
−#endif
+
−        _pr_initialized = PR_FALSE;
+
−        return PR_SUCCESS;
+
−    }
+
−    return PR_FAILURE;
+
−}  /* PR_Cleanup */
+
−
+
−PR_IMPLEMENT(void) PR_ProcessExit(PRIntn status)
+
−{
+
−    _exit(status);
+
−}
+
−
+
−PR_IMPLEMENT(PRUint32) PR_GetThreadID(PRThread *thred)
+
−{
+
−#if defined(_PR_DCETHREADS)
+
−    return (PRUint32)&thred->id;  /* this is really a sham! */
+
−#else
+
−    return (PRUint32)thred->id;  /* and I don't know what they will do with it */
+
−#endif
+
−}
+
−
+
−/*
+
− * $$$
+
− * The following two thread-to-processor affinity functions are not
+
− * yet implemented for pthreads.  By the way, these functions should return
+
− * PRStatus rather than PRInt32 to indicate the success/failure status.
+
− * $$$
+
− */
+
−
+
−PR_IMPLEMENT(PRInt32) PR_GetThreadAffinityMask(PRThread *thread, PRUint32 *mask)
+
−{
+
−    return 0;  /* not implemented */
+
−}
+
−
+
−PR_IMPLEMENT(PRInt32) PR_SetThreadAffinityMask(PRThread *thread, PRUint32 mask )
+
−{
+
−    return 0;  /* not implemented */
+
−}
+
−
+
−PR_IMPLEMENT(void)
+
−PR_SetThreadDumpProc(PRThread* thread, PRThreadDumpProc dump, void *arg)
+
−{
+
−    thread->dump = dump;
+
−    thread->dumpArg = arg;
+
−}
+
−
+
−/* 
+
− * Garbage collection support follows.
+
− */
+
−
+
−#if defined(_PR_DCETHREADS)
+
−
+
−/*
+
− * statics for Garbage Collection support.  We don't need to protect these
+
− * signal masks since the garbage collector itself is protected by a lock
+
− * and multiple threads will not be garbage collecting at the same time.
+
− */
+
−static sigset_t javagc_vtalarm_sigmask;
+
−static sigset_t javagc_intsoff_sigmask;
+
−
+
−#else /* defined(_PR_DCETHREADS) */
+
−
+
−/* a bogus signal mask for forcing a timed wait */
+
−/* Not so bogus in AIX as we really do a sigwait */
+
−static sigset_t sigwait_set;
+
−
+
−static struct timespec onemillisec = {0, 1000000L};
+
−#ifndef PT_NO_SIGTIMEDWAIT
+
−static struct timespec hundredmillisec = {0, 100000000L};
+
−#endif
+
−
+
−static void suspend_signal_handler(PRIntn sig);
+
−
+
−#ifdef PT_NO_SIGTIMEDWAIT
+
−static void null_signal_handler(PRIntn sig);
+
−#endif
+
−
+
−#endif /* defined(_PR_DCETHREADS) */
+
−
+
−/*
+
− * Linux pthreads use SIGUSR1 and SIGUSR2 internally, which
+
− * conflict with the use of these two signals in our GC support.
+
− * So we don't know how to support GC on Linux pthreads.
+
− */
+
−static void init_pthread_gc_support(void)
+
−{
+
−#ifndef SYMBIAN
+
−    PRIntn rv;
+
−
+
−#if defined(_PR_DCETHREADS)
+
−	rv = sigemptyset(&javagc_vtalarm_sigmask);
+
−    PR_ASSERT(0 == rv);
+
−	rv = sigaddset(&javagc_vtalarm_sigmask, SIGVTALRM);
+
−    PR_ASSERT(0 == rv);
+
−#else  /* defined(_PR_DCETHREADS) */
+
−	{
+
−	    struct sigaction sigact_usr2;
+
−
+
−	    sigact_usr2.sa_handler = suspend_signal_handler;
+
−	    sigact_usr2.sa_flags = SA_RESTART;
+
−	    sigemptyset (&sigact_usr2.sa_mask);
+
−
+
−        rv = sigaction (SIGUSR2, &sigact_usr2, NULL);
+
−        PR_ASSERT(0 == rv);
+
−
+
−        sigemptyset (&sigwait_set);
+
−#if defined(PT_NO_SIGTIMEDWAIT)
+
−        sigaddset (&sigwait_set, SIGUSR1);
+
−#else
+
−        sigaddset (&sigwait_set, SIGUSR2);
+
−#endif  /* defined(PT_NO_SIGTIMEDWAIT) */
+
−	}
+
−#if defined(PT_NO_SIGTIMEDWAIT)
+
−	{
+
−	    struct sigaction sigact_null;
+
−	    sigact_null.sa_handler = null_signal_handler;
+
−	    sigact_null.sa_flags = SA_RESTART;
+
−	    sigemptyset (&sigact_null.sa_mask);
+
−        rv = sigaction (SIGUSR1, &sigact_null, NULL);
+
−	    PR_ASSERT(0 ==rv); 
+
−    }
+
−#endif  /* defined(PT_NO_SIGTIMEDWAIT) */
+
−#endif /* defined(_PR_DCETHREADS) */
+
−#endif /* SYMBIAN */
+
−}
+
−
+
−PR_IMPLEMENT(void) PR_SetThreadGCAble(void)
+
−{
+
−    PR_Lock(pt_book.ml);
+
−	PR_GetCurrentThread()->state |= PT_THREAD_GCABLE;
+
−    PR_Unlock(pt_book.ml);
+
−}
+
−
+
−PR_IMPLEMENT(void) PR_ClearThreadGCAble(void)
+
−{
+
−    PR_Lock(pt_book.ml);
+
−	PR_GetCurrentThread()->state &= (~PT_THREAD_GCABLE);
+
−    PR_Unlock(pt_book.ml);
+
−}
+
−
+
−#if defined(DEBUG)
+
−static PRBool suspendAllOn = PR_FALSE;
+
−#endif
+
−
+
−static PRBool suspendAllSuspended = PR_FALSE;
+
−
+
−PR_IMPLEMENT(PRStatus) PR_EnumerateThreads(PREnumerator func, void *arg)
+
−{
+
−    PRIntn count = 0;
+
−    PRStatus rv = PR_SUCCESS;
+
−    PRThread* thred = pt_book.first;
+
−
+
−#if defined(DEBUG) || defined(FORCE_PR_ASSERT)
+
−#if !defined(_PR_DCETHREADS)
+
−    PRThread *me = PR_GetCurrentThread();
+
−#endif
+
−#endif
+
−
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_EnumerateThreads\n"));
+
−    /*
+
−     * $$$
+
−     * Need to suspend all threads other than me before doing this.
+
−     * This is really a gross and disgusting thing to do. The only
+
−     * good thing is that since all other threads are suspended, holding
+
−     * the lock during a callback seems like child's play.
+
−     * $$$
+
−     */
+
−    PR_ASSERT(suspendAllOn);
+
−
+
−    while (thred != NULL)
+
−    {
+
−        /* Steve Morse, 4-23-97: Note that we can't walk a queue by taking
+
−         * qp->next after applying the function "func".  In particular, "func"
+
−         * might remove the thread from the queue and put it into another one in
+
−         * which case qp->next no longer points to the next entry in the original
+
−         * queue.
+
−         *
+
−         * To get around this problem, we save qp->next in qp_next before applying
+
−         * "func" and use that saved value as the next value after applying "func".
+
−         */
+
−        PRThread* next = thred->next;
+
−
+
−        if (_PT_IS_GCABLE_THREAD(thred))
+
−        {
+
−#if !defined(_PR_DCETHREADS)
+
−            PR_ASSERT((thred == me) || (thred->suspend & PT_THREAD_SUSPENDED));
+
−#endif
+
−            PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
+
−                   ("In PR_EnumerateThreads callback thread %p thid = %X\n", 
+
−                    thred, thred->id));
+
−
+
−            rv = func(thred, count++, arg);
+
−            if (rv != PR_SUCCESS)
+
−                return rv;
+
−        }
+
−        thred = next;
+
−    }
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
+
−	   ("End PR_EnumerateThreads count = %d \n", count));
+
−    return rv;
+
−}  /* PR_EnumerateThreads */
+
−
+
−/*
+
− * PR_SuspendAll and PR_ResumeAll are called during garbage collection.  The strategy 
+
− * we use is to send a SIGUSR2 signal to every gc able thread that we intend to suspend.
+
− * The signal handler will record the stack pointer and will block until resumed by
+
− * the resume call.  Since the signal handler is the last routine called for the
+
− * suspended thread, the stack pointer will also serve as a place where all the
+
− * registers have been saved on the stack for the previously executing routines.
+
− *
+
− * Through global variables, we also make sure that PR_Suspend and PR_Resume does not
+
− * proceed until the thread is suspended or resumed.
+
− */
+
−
+
−#if !defined(_PR_DCETHREADS)
+
−
+
−/*
+
− * In the signal handler, we can not use condition variable notify or wait.
+
− * This does not work consistently across all pthread platforms.  We also can not 
+
− * use locking since that does not seem to work reliably across platforms.
+
− * Only thing we can do is yielding while testing for a global condition
+
− * to change.  This does work on pthread supported platforms.  We may have
+
− * to play with priortities if there are any problems detected.
+
− */
+
−
+
− /* 
+
−  * In AIX, you cannot use ANY pthread calls in the signal handler except perhaps
+
−  * pthread_yield. But that is horribly inefficient. Hence we use only sigwait, no
+
−  * sigtimedwait is available. We need to use another user signal, SIGUSR1. Actually
+
−  * SIGUSR1 is also used by exec in Java. So our usage here breaks the exec in Java,
+
−  * for AIX. You cannot use pthread_cond_wait or pthread_delay_np in the signal
+
−  * handler as all synchronization mechanisms just break down. 
+
−  */
+
−
+
−#if defined(PT_NO_SIGTIMEDWAIT)
+
−static void null_signal_handler(PRIntn sig)
+
−{
+
−	return;
+
−}
+
−#endif
+
−
+
−static void suspend_signal_handler(PRIntn sig)
+
−{
+
−	PRThread *me = PR_GetCurrentThread();
+
−
+
−	PR_ASSERT(me != NULL);
+
−	PR_ASSERT(_PT_IS_GCABLE_THREAD(me));
+
−	PR_ASSERT((me->suspend & PT_THREAD_SUSPENDED) == 0);
+
−
+
−	PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
+
−        ("Begin suspend_signal_handler thred %p thread id = %X\n", 
+
−		me, me->id));
+
−
+
−	/*
+
−	 * save stack pointer
+
−	 */
+
−	me->sp = &me;
+
−
+
−	/* 
+
−	   At this point, the thread's stack pointer has been saved,
+
−	   And it is going to enter a wait loop until it is resumed.
+
−	   So it is _really_ suspended 
+
−	*/
+
−
+
−	me->suspend |= PT_THREAD_SUSPENDED;
+
−
+
−	/*
+
−	 * now, block current thread
+
−	 */
+
−#if defined(PT_NO_SIGTIMEDWAIT)
+
−	pthread_cond_signal(&me->suspendResumeCV);
+
−	while (me->suspend & PT_THREAD_SUSPENDED)
+
−	{
+
−#if !defined(FREEBSD) && !defined(NETBSD) && !defined(OPENBSD) \
+
−    && !defined(BSDI) && !defined(UNIXWARE) \
+
−    && !defined(DARWIN) && !defined(RISCOS) \
+
−    && !defined(SYMBIAN) /*XXX*/
+
−        PRIntn rv;
+
−	    sigwait(&sigwait_set, &rv);
+
−#endif
+
−	}
+
−	me->suspend |= PT_THREAD_RESUMED;
+
−	pthread_cond_signal(&me->suspendResumeCV);
+
−#else /* defined(PT_NO_SIGTIMEDWAIT) */
+
−	while (me->suspend & PT_THREAD_SUSPENDED)
+
−	{
+
−		PRIntn rv = sigtimedwait(&sigwait_set, NULL, &hundredmillisec);
+
−    	PR_ASSERT(-1 == rv);
+
−	}
+
−	me->suspend |= PT_THREAD_RESUMED;
+
−#endif
+
−
+
−    /*
+
−     * At this point, thread has been resumed, so set a global condition.
+
−     * The ResumeAll needs to know that this has really been resumed. 
+
−     * So the signal handler sets a flag which PR_ResumeAll will reset. 
+
−     * The PR_ResumeAll must reset this flag ...
+
−     */
+
−
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
+
−        ("End suspend_signal_handler thred = %p tid = %X\n", me, me->id));
+
−}  /* suspend_signal_handler */
+
−
+
−static void pt_SuspendSet(PRThread *thred)
+
−{
+
−    PRIntn rv;
+
−
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
+
−	   ("pt_SuspendSet thred %p thread id = %X\n", thred, thred->id));
+
−
+
−
+
−    /*
+
−     * Check the thread state and signal the thread to suspend
+
−     */
+
−
+
−    PR_ASSERT((thred->suspend & PT_THREAD_SUSPENDED) == 0);
+
−
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
+
−	   ("doing pthread_kill in pt_SuspendSet thred %p tid = %X\n",
+
−	   thred, thred->id));
+
−#if defined(SYMBIAN)
+
−    /* All signal group functions are not implemented in Symbian OS */
+
−    rv = 0;
+
−#else
+
−    rv = pthread_kill (thred->id, SIGUSR2);
+
−#endif
+
−    PR_ASSERT(0 == rv);
+
−}
+
−
+
−static void pt_SuspendTest(PRThread *thred)
+
−{
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
+
−	   ("Begin pt_SuspendTest thred %p thread id = %X\n", thred, thred->id));
+
−
+
−
+
−    /*
+
−     * Wait for the thread to be really suspended. This happens when the
+
−     * suspend signal handler stores the stack pointer and sets the state
+
−     * to suspended. 
+
−     */
+
−
+
−#if defined(PT_NO_SIGTIMEDWAIT)
+
−    pthread_mutex_lock(&thred->suspendResumeMutex);
+
−    while ((thred->suspend & PT_THREAD_SUSPENDED) == 0)
+
−    {
+
−	    pthread_cond_timedwait(
+
−	        &thred->suspendResumeCV, &thred->suspendResumeMutex, &onemillisec);
+
−	}
+
−	pthread_mutex_unlock(&thred->suspendResumeMutex);
+
−#else
+
−    while ((thred->suspend & PT_THREAD_SUSPENDED) == 0)
+
−    {
+
−		PRIntn rv = sigtimedwait(&sigwait_set, NULL, &onemillisec);
+
−    	PR_ASSERT(-1 == rv);
+
−	}
+
−#endif
+
−
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+
−        ("End pt_SuspendTest thred %p tid %X\n", thred, thred->id));
+
−}  /* pt_SuspendTest */
+
−
+
−static void pt_ResumeSet(PRThread *thred)
+
−{
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
+
−	   ("pt_ResumeSet thred %p thread id = %X\n", thred, thred->id));
+
−
+
−    /*
+
−     * Clear the global state and set the thread state so that it will
+
−     * continue past yield loop in the suspend signal handler
+
−     */
+
−
+
−    PR_ASSERT(thred->suspend & PT_THREAD_SUSPENDED);
+
−
+
−
+
−    thred->suspend &= ~PT_THREAD_SUSPENDED;
+
−
+
−#if defined(PT_NO_SIGTIMEDWAIT)
+
−#if defined(SYMBIAN) 
+
−	/* All signal group functions are not implemented in Symbian OS */
+
−#else
+
−	pthread_kill(thred->id, SIGUSR1);
+
−#endif
+
−#endif
+
−
+
−}  /* pt_ResumeSet */
+
−
+
−static void pt_ResumeTest(PRThread *thred)
+
−{
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
+
−	   ("Begin pt_ResumeTest thred %p thread id = %X\n", thred, thred->id));
+
−
+
−    /*
+
−     * Wait for the threads resume state to change
+
−     * to indicate it is really resumed 
+
−     */
+
−#if defined(PT_NO_SIGTIMEDWAIT)
+
−    pthread_mutex_lock(&thred->suspendResumeMutex);
+
−    while ((thred->suspend & PT_THREAD_RESUMED) == 0)
+
−    {
+
−	    pthread_cond_timedwait(
+
−	        &thred->suspendResumeCV, &thred->suspendResumeMutex, &onemillisec);
+
−    }
+
−    pthread_mutex_unlock(&thred->suspendResumeMutex);
+
−#else
+
−    while ((thred->suspend & PT_THREAD_RESUMED) == 0) {
+
−		PRIntn rv = sigtimedwait(&sigwait_set, NULL, &onemillisec);
+
−    	PR_ASSERT(-1 == rv);
+
−	}
+
−#endif
+
−
+
−    thred->suspend &= ~PT_THREAD_RESUMED;
+
−
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, (
+
−        "End pt_ResumeTest thred %p tid %X\n", thred, thred->id));
+
−}  /* pt_ResumeTest */
+
−
+
−static pthread_once_t pt_gc_support_control = PTHREAD_ONCE_INIT;
+
−
+
−PR_IMPLEMENT(void) PR_SuspendAll(void)
+
−{
+
−#ifdef DEBUG
+
−    PRIntervalTime stime, etime;
+
−#endif
+
−    PRThread* thred = pt_book.first;
+
−    PRThread *me = PR_GetCurrentThread();
+
−    int rv;
+
−
+
−    rv = pthread_once(&pt_gc_support_control, init_pthread_gc_support);
+
−    PR_ASSERT(0 == rv);
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_SuspendAll\n"));
+
−    /*
+
−     * Stop all threads which are marked GC able.
+
−     */
+
−    PR_Lock(pt_book.ml);
+
−#ifdef DEBUG
+
−    suspendAllOn = PR_TRUE;
+
−    stime = PR_IntervalNow();
+
−#endif
+
−    while (thred != NULL)
+
−    {
+
−	    if ((thred != me) && _PT_IS_GCABLE_THREAD(thred))
+
−    		pt_SuspendSet(thred);
+
−        thred = thred->next;
+
−    }
+
−
+
−    /* Wait till they are really suspended */
+
−    thred = pt_book.first;
+
−    while (thred != NULL)
+
−    {
+
−	    if ((thred != me) && _PT_IS_GCABLE_THREAD(thred))
+
−            pt_SuspendTest(thred);
+
−        thred = thred->next;
+
−    }
+
−
+
−    suspendAllSuspended = PR_TRUE;
+
−
+
−#ifdef DEBUG
+
−    etime = PR_IntervalNow();
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,\
+
−        ("End PR_SuspendAll (time %dms)\n",
+
−        PR_IntervalToMilliseconds(etime - stime)));
+
−#endif
+
−}  /* PR_SuspendAll */
+
−
+
−PR_IMPLEMENT(void) PR_ResumeAll(void)
+
−{
+
−#ifdef DEBUG
+
−    PRIntervalTime stime, etime;
+
−#endif
+
−    PRThread* thred = pt_book.first;
+
−    PRThread *me = PR_GetCurrentThread();
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_ResumeAll\n"));
+
−    /*
+
−     * Resume all previously suspended GC able threads.
+
−     */
+
−    suspendAllSuspended = PR_FALSE;
+
−#ifdef DEBUG
+
−    stime = PR_IntervalNow();
+
−#endif
+
−
+
−    while (thred != NULL)
+
−    {
+
−	    if ((thred != me) && _PT_IS_GCABLE_THREAD(thred))
+
−    	    pt_ResumeSet(thred);
+
−        thred = thred->next;
+
−    }
+
−
+
−    thred = pt_book.first;
+
−    while (thred != NULL)
+
−    {
+
−	    if ((thred != me) && _PT_IS_GCABLE_THREAD(thred))
+
−    	    pt_ResumeTest(thred);
+
−        thred = thred->next;
+
−    }
+
−
+
−    PR_Unlock(pt_book.ml);
+
−#ifdef DEBUG
+
−    suspendAllOn = PR_FALSE;
+
−    etime = PR_IntervalNow();
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+
−        ("End PR_ResumeAll (time %dms)\n",
+
−        PR_IntervalToMilliseconds(etime - stime)));
+
−#endif
+
−}  /* PR_ResumeAll */
+
−
+
−/* Return the stack pointer for the given thread- used by the GC */
+
−PR_IMPLEMENT(void *)PR_GetSP(PRThread *thred)
+
−{
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
+
−	    ("in PR_GetSP thred %p thid = %X, sp = %p\n", 
+
−	    thred, thred->id, thred->sp));
+
−    return thred->sp;
+
−}  /* PR_GetSP */
+
−
+
−#else /* !defined(_PR_DCETHREADS) */
+
−
+
−static pthread_once_t pt_gc_support_control = pthread_once_init;
+
−
+
−/*
+
− * For DCE threads, there is no pthread_kill or a way of suspending or resuming a
+
− * particular thread.  We will just disable the preemption (virtual timer alarm) and
+
− * let the executing thread finish the garbage collection.  This stops all other threads
+
− * (GC able or not) and is very inefficient but there is no other choice.
+
− */
+
−PR_IMPLEMENT(void) PR_SuspendAll()
+
−{
+
−    PRIntn rv;
+
−
+
−    rv = pthread_once(&pt_gc_support_control, init_pthread_gc_support);
+
−    PR_ASSERT(0 == rv);  /* returns -1 on failure */
+
−#ifdef DEBUG
+
−    suspendAllOn = PR_TRUE;
+
−#endif
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_SuspendAll\n"));
+
−    /* 
+
−     * turn off preemption - i.e add virtual alarm signal to the set of 
+
−     * blocking signals 
+
−     */
+
−    rv = sigprocmask(
+
−        SIG_BLOCK, &javagc_vtalarm_sigmask, &javagc_intsoff_sigmask);
+
−    PR_ASSERT(0 == rv);
+
−    suspendAllSuspended = PR_TRUE;
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End PR_SuspendAll\n"));
+
−}  /* PR_SuspendAll */
+
−
+
−PR_IMPLEMENT(void) PR_ResumeAll()
+
−{
+
−    PRIntn rv;
+
−    
+
−    suspendAllSuspended = PR_FALSE;
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_ResumeAll\n"));
+
−    /* turn on preemption - i.e re-enable virtual alarm signal */
+
−
+
−    rv = sigprocmask(SIG_SETMASK, &javagc_intsoff_sigmask, (sigset_t *)NULL);
+
−    PR_ASSERT(0 == rv);
+
−#ifdef DEBUG
+
−    suspendAllOn = PR_FALSE;
+
−#endif
+
−
+
−    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End PR_ResumeAll\n"));
+
−}  /* PR_ResumeAll */
+
−
+
−/* Return the stack pointer for the given thread- used by the GC */
+
−PR_IMPLEMENT(void*)PR_GetSP(PRThread *thred)
+
−{
+
−	pthread_t tid = thred->id;
+
−	char *thread_tcb, *top_sp;
+
−
+
−	/*
+
−	 * For HPUX DCE threads, pthread_t is a struct with the
+
−	 * following three fields (see pthread.h, dce/cma.h):
+
−	 *     cma_t_address       field1;
+
−	 *     short int           field2;
+
−	 *     short int           field3;
+
−	 * where cma_t_address is typedef'd to be either void*
+
−	 * or char*.
+
−	 */
+
−	PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_GetSP\n"));
+
−	thread_tcb = (char*)tid.field1;
+
−	top_sp = *(char**)(thread_tcb + 128);
+
−	PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End PR_GetSP %p \n", top_sp));
+
−	return top_sp;
+
−}  /* PR_GetSP */
+
−
+
−#endif /* !defined(_PR_DCETHREADS) */
+
−
+
−PR_IMPLEMENT(PRStatus) PR_SetCurrentThreadName(const char *name)
+
−{
+
−    PRThread *thread;
+
−    size_t nameLen;
+
−    int result = 0;
+
−
+
−    if (!name) {
+
−        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+
−        return PR_FAILURE;
+
−    }
+
−
+
−    thread = PR_GetCurrentThread();
+
−    if (!thread)
+
−        return PR_FAILURE;
+
−
+
−    PR_Free(thread->name);
+
−    nameLen = strlen(name);
+
−    thread->name = (char *)PR_Malloc(nameLen + 1);
+
−    if (!thread->name)
+
−        return PR_FAILURE;
+
−    memcpy(thread->name, name, nameLen + 1);
+
−
+
−#if defined(OPENBSD) || defined(FREEBSD) || defined(DRAGONFLY)
+
−    pthread_set_name_np(thread->id, name);
+
−#elif defined(NETBSD)
+
−    result = pthread_setname_np(thread->id, "%s", (void *)name);
+
−#else /* not BSD */
+
−    /*
+
−     * On OSX, pthread_setname_np is only available in 10.6 or later, so test
+
−     * for it at runtime.  It also may not be available on all linux distros.
+
−     */
+
−#if defined(DARWIN)
+
−    int (*dynamic_pthread_setname_np)(const char*);
+
−#else
+
−    int (*dynamic_pthread_setname_np)(pthread_t, const char*);
+
−#endif
+
−
+
−    *(void**)(&dynamic_pthread_setname_np) =
+
−        dlsym(RTLD_DEFAULT, "pthread_setname_np");
+
−    if (!dynamic_pthread_setname_np)
+
−        return PR_SUCCESS;
+
−
+
−    /*
+
−     * The 15-character name length limit is an experimentally determined
+
−     * length of a null-terminated string that most linux distros and OS X
+
−     * accept as an argument to pthread_setname_np.  Otherwise the E2BIG
+
−     * error is returned by the function.
+
−     */
+
−#define SETNAME_LENGTH_CONSTRAINT 15
+
−#define SETNAME_FRAGMENT1_LENGTH (SETNAME_LENGTH_CONSTRAINT >> 1)
+
−#define SETNAME_FRAGMENT2_LENGTH \
+
−    (SETNAME_LENGTH_CONSTRAINT - SETNAME_FRAGMENT1_LENGTH - 1)
+
−    char name_dup[SETNAME_LENGTH_CONSTRAINT + 1];
+
−    if (nameLen > SETNAME_LENGTH_CONSTRAINT) {
+
−        memcpy(name_dup, name, SETNAME_FRAGMENT1_LENGTH);
+
−        name_dup[SETNAME_FRAGMENT1_LENGTH] = '~';
+
−        /* Note that this also copies the null terminator. */
+
−        memcpy(name_dup + SETNAME_FRAGMENT1_LENGTH + 1,
+
−               name + nameLen - SETNAME_FRAGMENT2_LENGTH,
+
−               SETNAME_FRAGMENT2_LENGTH + 1);
+
−        name = name_dup;
+
−    }
+
−
+
−#if defined(DARWIN)
+
−    result = dynamic_pthread_setname_np(name);
+
−#else
+
−    result = dynamic_pthread_setname_np(thread->id, name);
+
−#endif
+
−#endif /* not BSD */
+
−
+
−    if (result) {
+
−        PR_SetError(PR_UNKNOWN_ERROR, result);
+
−        return PR_FAILURE;
+
−    }
+
−    return PR_SUCCESS;
+
−}
+
−
+
−PR_IMPLEMENT(const char *) PR_GetThreadName(const PRThread *thread)
+
−{
+
−    if (!thread)
+
−        return NULL;
+
−    return thread->name;
+
−}
+
−
+
−#endif  /* defined(_PR_PTHREADS) || defined(_PR_DCETHREADS) */
+
−
+
−/* ptthread.c */