memory/jemalloc/jemalloc.h
author Neil Deakin <neil@mozilla.com>
Wed, 10 Jun 2009 14:00:39 -0400
changeset 29018 cabb8925dcd3d831a244b01e0a37c29b8793c77b
parent 27812 e6675b1c79a8e166dd89b4f5cdf8de0c1bdd87db
child 31454 9fbf8217bd4738f00c282e68ae72a156f8a6fd30
permissions -rw-r--r--
Bug 178324, refactor focus by moving all focus handling into one place and simplifying it, add many tests, fixes many other bugs too numerous to mention in this small checkin comment, r=josh,smichaud,ere,dbaron,marco,neil,gavin,smaug,sr=smaug (CLOSED TREE)

/* -*- Mode: C; tab-width: 8; c-basic-offset: 8 -*- */
/* vim:set softtabstop=8 shiftwidth=8: */
/*-
 * Copyright (C) 2006-2008 Jason Evans <jasone@FreeBSD.org>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice(s), this list of conditions and the following disclaimer as
 *    the first lines of this file unmodified other than the possible
 *    addition of one or more copyright notices.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice(s), this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _JEMALLOC_H_
#define _JEMALLOC_H_

/* grab size_t */
#ifdef _MSC_VER
#include <crtdefs.h>
#else
#include <stddef.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

typedef unsigned char jemalloc_bool;

extern const char	*_malloc_options;

/*
 * jemalloc_stats() is not a stable interface.  When using jemalloc_stats_t, be
 * sure that the compiled results of jemalloc.c are in sync with this header
 * file.
 */
typedef struct {
	/*
	 * Run-time configuration settings.
	 */
	jemalloc_bool	opt_abort;	/* abort(3) on error? */
	jemalloc_bool	opt_junk;	/* Fill allocated/free memory with 0xa5/0x5a? */
	jemalloc_bool	opt_utrace;	/* Trace all allocation events? */
	jemalloc_bool	opt_sysv;	/* SysV semantics? */
	jemalloc_bool	opt_xmalloc;	/* abort(3) on OOM? */
	jemalloc_bool	opt_zero;	/* Fill allocated memory with 0x0? */
	size_t	narenas;	/* Number of arenas. */
	size_t	balance_threshold; /* Arena contention rebalance threshold. */
	size_t	quantum;	/* Allocation quantum. */
	size_t	small_max;	/* Max quantum-spaced allocation size. */
	size_t	large_max;	/* Max sub-chunksize allocation size. */
	size_t	chunksize;	/* Size of each virtual memory mapping. */
	size_t	dirty_max;	/* Max dirty pages per arena. */
	size_t	reserve_min;	/* reserve_low callback threshold. */
	size_t	reserve_max;	/* Maximum reserve size before unmapping. */

	/*
	 * Current memory usage statistics.
	 */
	size_t	mapped;		/* Bytes mapped (not necessarily committed). */
	size_t	committed;	/* Bytes committed (readable/writable). */
	size_t	allocated;	/* Bytes allocted (in use by application). */
	size_t	dirty;		/* Bytes dirty (committed unused pages). */
	size_t	reserve_cur;	/* Current memory reserve. */
} jemalloc_stats_t;

#ifndef MOZ_MEMORY_DARWIN
void	*malloc(size_t size);
void	*valloc(size_t size);
void	*calloc(size_t num, size_t size);
void	*realloc(void *ptr, size_t size);
void	free(void *ptr);
#endif

int	posix_memalign(void **memptr, size_t alignment, size_t size);
void	*memalign(size_t alignment, size_t size);
size_t	malloc_usable_size(const void *ptr);
void	jemalloc_stats(jemalloc_stats_t *stats);

/* The x*() functions never return NULL. */
void	*xmalloc(size_t size);
void	*xcalloc(size_t num, size_t size);
void	*xrealloc(void *ptr, size_t size);
void	*xmemalign(size_t alignment, size_t size);

/*
 * The allocator maintains a memory reserve that is used to satisfy allocation
 * requests when no additional memory can be acquired from the operating
 * system.  Under normal operating conditions, the reserve size is at least
 * reserve_min bytes.  If the reserve is depleted or insufficient to satisfy an
 * allocation request, then condition notifications are sent to one or more of
 * the registered callback functions:
 *
 *   RESERVE_CND_LOW: The reserve had to be used to satisfy an allocation
 *                    request, which dropped the reserve size below the
 *                    minimum.  The callee should try to free memory in order
 *                    to restore the reserve.
 *
 *   RESERVE_CND_CRIT: The reserve was not large enough to satisfy a pending
 *                     allocation request.  Some callee must free adequate
 *                     memory in order to prevent application failure (unless
 *                     the condition spontaneously desists due to concurrent
 *                     deallocation).
 *
 *   RESERVE_CND_FAIL: An allocation request could not be satisfied, despite all
 *                     attempts.  The allocator is about to terminate the
 *                     application.
 *
 * The order in which the callback functions are called is only loosely
 * specified: in the absence of interposing callback
 * registrations/unregistrations, enabled callbacks will be called in an
 * arbitrary round-robin order.
 *
 * Condition notifications are sent to callbacks only while conditions exist.
 * For example, just before the allocator sends a RESERVE_CND_LOW condition
 * notification to a callback, the reserve is in fact depleted.  However, due
 * to allocator concurrency, the reserve may have been restored by the time the
 * callback function executes.  Furthermore, if the reserve is restored at some
 * point during the delivery of condition notifications to callbacks, no
 * further deliveries will occur, since the condition no longer exists.
 *
 * Callback functions can freely call back into the allocator (i.e. the
 * allocator releases all internal resources before calling each callback
 * function), though allocation is discouraged, since recursive callbacks are
 * likely to result, which places extra burden on the application to avoid
 * deadlock.
 *
 * Callback functions must be thread-safe, since it is possible that multiple
 * threads will call into the same callback function concurrently.
 */

/* Memory reserve condition types. */
typedef enum {
	RESERVE_CND_LOW,
	RESERVE_CND_CRIT,
	RESERVE_CND_FAIL
} reserve_cnd_t;

/*
 * Reserve condition notification callback function type definition.
 *
 * Inputs:
 *   ctx: Opaque application data, as passed to reserve_cb_register().
 *   cnd: Condition type being delivered.
 *   size: Allocation request size for the allocation that caused the condition.
 */
typedef void reserve_cb_t(void *ctx, reserve_cnd_t cnd, size_t size);

/*
 * Register a callback function.
 *
 * Inputs:
 *   cb: Callback function pointer.
 *   ctx: Opaque application data, passed to cb().
 *
 * Output:
 *   ret: If true, failure due to OOM; success otherwise.
 */
jemalloc_bool	reserve_cb_register(reserve_cb_t *cb, void *ctx);

/*
 * Unregister a callback function.
 *
 * Inputs:
 *   cb: Callback function pointer.
 *   ctx: Opaque application data, same as that passed to reserve_cb_register().
 *
 * Output:
 *   ret: False upon success, true if the {cb,ctx} registration could not be
 *        found.
 */
jemalloc_bool	reserve_cb_unregister(reserve_cb_t *cb, void *ctx);

/*
 * Get the current reserve size.
 *
 * ret: Current reserve size.
 */
size_t	reserve_cur_get(void);

/*
 * Get the minimum acceptable reserve size.  If the reserve drops below this
 * value, the RESERVE_CND_LOW condition notification is sent to the callbacks.
 *
 * ret: Minimum acceptable reserve size.
 */
size_t	reserve_min_get(void);

/*
 * Set the minimum acceptable reserve size.
 *
 * min: Reserve threshold.  This value may be internally rounded up.
 * ret: False if the reserve was successfully resized; true otherwise.  Note
 *      that failure to resize the reserve also results in a RESERVE_CND_LOW
 *      condition.
 */
jemalloc_bool	reserve_min_set(size_t min);

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* _JEMALLOC_H_ */