profile/dirserviceprovider/src/nsProfileLock.h
author Mike Hommey <mh@glandium.org>
Fri, 25 Feb 2011 12:53:36 +0100
changeset 69247 4820d39b86d725bd2770b4b37ccbb8aca2c4c928
parent 57039 0b96513bbfd454af711a156b26cb5e84f9b534a5
child 71118 6e230988614fb99eb6967d6e24c7b7daad01b68c
permissions -rw-r--r--
Bug 620931 part 3 - Allow GRE and XUL application to use omni.jar independently. r=bsmedberg,r=mwu We now store two independent locations for an omni.jar, allowing GRE/XRE and XUL application to each have their own omni.jar. And since xulrunner setups are very independent from the XUL applications, we implement support for both omni.jar and non omni.jar cases in the same runtime, with the side effect of allowing to switch from one to the other manually without rebuilding the binaries. We let the mozilla::Omnijar API handle both cases, so that callers don't need too much work to support them. We also make the preferences service load the same set of preferences in all the various cases (unified vs. separate, omni.jar vs. no omni.jar). The child process launcher for IPC is modified to pass the base directories needed for the mozilla::Omnijar API initialization in the child process. Finally, the startupcache file name canonicalization is modified to separate APP and GRE resources.

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * for the specific language governing rights and limitations under the
 * License.
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 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Conrad Carlen <ccarlen@netscape.com>
 *   Brendan Eich <brendan@mozilla.org>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
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#ifndef __nsProfileLock_h___
#define __nsProfileLock_h___

#include "nsILocalFile.h"

class nsIProfileUnlocker;

#if defined (XP_WIN)
#include <windows.h>
#endif

#if defined (XP_OS2)
#define INCL_DOSERRORS
#define INCL_DOSFILEMGR
#include <os2.h>
#endif

#if defined (XP_UNIX)
#include <signal.h>
#include "prclist.h"
#endif

class nsProfileLock
#if defined (XP_UNIX)
  : public PRCList
#endif
{
public:
                            nsProfileLock();
                            nsProfileLock(nsProfileLock& src);

                            ~nsProfileLock();
 
    nsProfileLock&          operator=(nsProfileLock& rhs);
                       
    /**
     * Attempt to lock a profile directory.
     *
     * @param aProfileDir  [in] The profile directory to lock.
     * @param aUnlocker    [out] Optional. This is only returned when locking
     *                     fails with NS_ERROR_FILE_ACCESS_DENIED, and may not
     *                     be returned at all.
     * @throws NS_ERROR_FILE_ACCESS_DENIED if the profile is locked.
     */
    nsresult                Lock(nsILocalFile* aProfileDir, nsIProfileUnlocker* *aUnlocker);

    /**
     * Unlock a profile directory.  If you're unlocking the directory because
     * the application is in the process of shutting down because of a fatal
     * signal, set aFatalSignal to PR_TRUE.
     */
    nsresult                Unlock(PRBool aFatalSignal = PR_FALSE);
        
private:
    PRPackedBool            mHaveLock;

#if defined (XP_WIN)
    HANDLE                  mLockFileHandle;
#elif defined (XP_OS2)
    LHANDLE                 mLockFileHandle;
#elif defined (XP_UNIX)

    static void             RemovePidLockFilesExiting()
    {
      // We can't implement this function with a default parameter on
      // RemovePidLockFiles(aFatalSignal) since we register
      //    atexit(RemovePidLockFilesExiting).

      RemovePidLockFiles(PR_FALSE);
    }

    static void             RemovePidLockFiles(PRBool aFatalSignal);
    static void             FatalSignalHandler(int signo
#ifdef SA_SIGINFO
                                               , siginfo_t *info, void *context
#endif
                                               );
    static PRCList          mPidLockList;

    nsresult                LockWithFcntl(const nsACString& lockFilePath);

    /**
     * @param aHaveFcntlLock if true, we've already acquired an fcntl lock so this
     * lock is merely an "obsolete" lock to keep out old Firefoxes
     */
    nsresult                LockWithSymlink(const nsACString& lockFilePath, PRBool aHaveFcntlLock);

    char*                   mPidLockFileName;
    int                     mLockFileDesc;
#endif

};

#endif /* __nsProfileLock_h___ */