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- /*
- * Copyright (C) 2004-2006 Internet Systems Consortium, Inc. ("ISC")
- * Copyright (C) 1997-2001 Internet Software Consortium.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
- * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
- * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
- * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- * PERFORMANCE OF THIS SOFTWARE.
- */
-
- /* $Id: mem.h,v 1.59.18.9 2006/01/04 23:50:23 marka Exp $ */
-
- #ifndef ISC_MEM_H
- #define ISC_MEM_H 1
-
- /*! \file */
-
- #include <stdio.h>
-
- #include <isc/lang.h>
- #include <isc/mutex.h>
- #include <isc/platform.h>
- #include <isc/types.h>
-
- ISC_LANG_BEGINDECLS
-
- #define ISC_MEM_LOWATER 0
- #define ISC_MEM_HIWATER 1
- typedef void (*isc_mem_water_t)(void *, int);
-
- typedef void * (*isc_memalloc_t)(void *, size_t);
- typedef void (*isc_memfree_t)(void *, void *);
-
- /*%
- * Define ISC_MEM_DEBUG=1 to make all functions that free memory
- * set the pointer being freed to NULL after being freed.
- * This is the default; set ISC_MEM_DEBUG=0 to disable it.
- */
- #ifndef ISC_MEM_DEBUG
- #define ISC_MEM_DEBUG 1
- #endif
-
- /*%
- * Define ISC_MEM_TRACKLINES=1 to turn on detailed tracing of memory
- * allocation and freeing by file and line number.
- */
- #ifndef ISC_MEM_TRACKLINES
- #define ISC_MEM_TRACKLINES 1
- #endif
-
- /*%
- * Define ISC_MEM_CHECKOVERRUN=1 to turn on checks for using memory outside
- * the requested space. This will increase the size of each allocation.
- */
- #ifndef ISC_MEM_CHECKOVERRUN
- #define ISC_MEM_CHECKOVERRUN 1
- #endif
-
- /*%
- * Define ISC_MEM_FILL=1 to fill each block of memory returned to the system
- * with the byte string '0xbe'. This helps track down uninitialized pointers
- * and the like. On freeing memory, the space is filled with '0xde' for
- * the same reasons.
- */
- #ifndef ISC_MEM_FILL
- #define ISC_MEM_FILL 1
- #endif
-
- /*%
- * Define ISC_MEMPOOL_NAMES=1 to make memory pools store a symbolic
- * name so that the leaking pool can be more readily identified in
- * case of a memory leak.
- */
- #ifndef ISC_MEMPOOL_NAMES
- #define ISC_MEMPOOL_NAMES 1
- #endif
-
- LIBISC_EXTERNAL_DATA extern unsigned int isc_mem_debugging;
- /*@{*/
- #define ISC_MEM_DEBUGTRACE 0x00000001U
- #define ISC_MEM_DEBUGRECORD 0x00000002U
- #define ISC_MEM_DEBUGUSAGE 0x00000004U
- #define ISC_MEM_DEBUGSIZE 0x00000008U
- #define ISC_MEM_DEBUGCTX 0x00000010U
- #define ISC_MEM_DEBUGALL 0x0000001FU
- /*!<
- * The variable isc_mem_debugging holds a set of flags for
- * turning certain memory debugging options on or off at
- * runtime. Its is intialized to the value ISC_MEM_DEGBUGGING,
- * which is 0 by default but may be overridden at compile time.
- * The following flags can be specified:
- *
- * \li #ISC_MEM_DEBUGTRACE
- * Log each allocation and free to isc_lctx.
- *
- * \li #ISC_MEM_DEBUGRECORD
- * Remember each allocation, and match them up on free.
- * Crash if a free doesn't match an allocation.
- *
- * \li #ISC_MEM_DEBUGUSAGE
- * If a hi_water mark is set, print the maximium inuse memory
- * every time it is raised once it exceeds the hi_water mark.
- *
- * \li #ISC_MEM_DEBUGSIZE
- * Check the size argument being passed to isc_mem_put() matches
- * that passed to isc_mem_get().
- *
- * \li #ISC_MEM_DEBUGCTX
- * Check the mctx argument being passed to isc_mem_put() matches
- * that passed to isc_mem_get().
- */
- /*@}*/
-
- #if ISC_MEM_TRACKLINES
- #define _ISC_MEM_FILELINE , __FILE__, __LINE__
- #define _ISC_MEM_FLARG , const char *, int
- #else
- #define _ISC_MEM_FILELINE
- #define _ISC_MEM_FLARG
- #endif
-
- /*!
- * Define ISC_MEM_USE_INTERNAL_MALLOC=1 to use the internal malloc()
- * implementation in preference to the system one. The internal malloc()
- * is very space-efficient, and quite fast on uniprocessor systems. It
- * performs poorly on multiprocessor machines.
- * JT: we can overcome the performance issue on multiprocessor machines
- * by carefully separating memory contexts.
- */
-
- #ifndef ISC_MEM_USE_INTERNAL_MALLOC
- #define ISC_MEM_USE_INTERNAL_MALLOC 1
- #endif
-
- /*
- * Flags for isc_mem_create2()calls.
- */
- #define ISC_MEMFLAG_NOLOCK 0x00000001 /* no lock is necessary */
- #define ISC_MEMFLAG_INTERNAL 0x00000002 /* use internal malloc */
- #if ISC_MEM_USE_INTERNAL_MALLOC
- #define ISC_MEMFLAG_DEFAULT ISC_MEMFLAG_INTERNAL
- #else
- #define ISC_MEMFLAG_DEFAULT 0
- #endif
-
-
- #define isc_mem_get(c, s) isc__mem_get((c), (s) _ISC_MEM_FILELINE)
- #define isc_mem_allocate(c, s) isc__mem_allocate((c), (s) _ISC_MEM_FILELINE)
- #define isc_mem_strdup(c, p) isc__mem_strdup((c), (p) _ISC_MEM_FILELINE)
- #define isc_mempool_get(c) isc__mempool_get((c) _ISC_MEM_FILELINE)
-
- /*%
- * isc_mem_putanddetach() is a convienence function for use where you
- * have a structure with an attached memory context.
- *
- * Given:
- *
- * \code
- * struct {
- * ...
- * isc_mem_t *mctx;
- * ...
- * } *ptr;
- *
- * isc_mem_t *mctx;
- *
- * isc_mem_putanddetach(&ptr->mctx, ptr, sizeof(*ptr));
- * \endcode
- *
- * is the equivalent of:
- *
- * \code
- * mctx = NULL;
- * isc_mem_attach(ptr->mctx, &mctx);
- * isc_mem_detach(&ptr->mctx);
- * isc_mem_put(mctx, ptr, sizeof(*ptr));
- * isc_mem_detach(&mctx);
- * \endcode
- */
-
- #if ISC_MEM_DEBUG
- #define isc_mem_put(c, p, s) \
- do { \
- isc__mem_put((c), (p), (s) _ISC_MEM_FILELINE); \
- (p) = NULL; \
- } while (0)
- #define isc_mem_putanddetach(c, p, s) \
- do { \
- isc__mem_putanddetach((c), (p), (s) _ISC_MEM_FILELINE); \
- (p) = NULL; \
- } while (0)
- #define isc_mem_free(c, p) \
- do { \
- isc__mem_free((c), (p) _ISC_MEM_FILELINE); \
- (p) = NULL; \
- } while (0)
- #define isc_mempool_put(c, p) \
- do { \
- isc__mempool_put((c), (p) _ISC_MEM_FILELINE); \
- (p) = NULL; \
- } while (0)
- #else
- #define isc_mem_put(c, p, s) isc__mem_put((c), (p), (s) _ISC_MEM_FILELINE)
- #define isc_mem_putanddetach(c, p, s) \
- isc__mem_putanddetach((c), (p), (s) _ISC_MEM_FILELINE)
- #define isc_mem_free(c, p) isc__mem_free((c), (p) _ISC_MEM_FILELINE)
- #define isc_mempool_put(c, p) isc__mempool_put((c), (p) _ISC_MEM_FILELINE)
- #endif
-
- /*@{*/
- isc_result_t
- isc_mem_create(size_t max_size, size_t target_size,
- isc_mem_t **mctxp);
-
- isc_result_t
- isc_mem_create2(size_t max_size, size_t target_size,
- isc_mem_t **mctxp, unsigned int flags);
-
- isc_result_t
- isc_mem_createx(size_t max_size, size_t target_size,
- isc_memalloc_t memalloc, isc_memfree_t memfree,
- void *arg, isc_mem_t **mctxp);
-
- isc_result_t
- isc_mem_createx2(size_t max_size, size_t target_size,
- isc_memalloc_t memalloc, isc_memfree_t memfree,
- void *arg, isc_mem_t **mctxp, unsigned int flags);
-
- /*!<
- * \brief Create a memory context.
- *
- * 'max_size' and 'target_size' are tuning parameters. When
- * ISC_MEMFLAG_INTERNAL is set, allocations smaller than 'max_size'
- * will be satisfied by getting blocks of size 'target_size' from the
- * system allocator and breaking them up into pieces; larger allocations
- * will use the system allocator directly. If 'max_size' and/or
- * 'target_size' are zero, default values will be * used. When
- * ISC_MEMFLAG_INTERNAL is not set, 'target_size' is ignored.
- *
- * 'max_size' is also used to size the statistics arrays and the array
- * used to record active memory when ISC_MEM_DEBUGRECORD is set. Settin
- * 'max_size' too low can have detrimental effects on performance.
- *
- * A memory context created using isc_mem_createx() will obtain
- * memory from the system by calling 'memalloc' and 'memfree',
- * passing them the argument 'arg'. A memory context created
- * using isc_mem_create() will use the standard library malloc()
- * and free().
- *
- * If ISC_MEMFLAG_NOLOCK is set in 'flags', the corresponding memory context
- * will be accessed without locking. The user who creates the context must
- * ensure there be no race. Since this can be a source of bug, it is generally
- * inadvisable to use this flag unless the user is very sure about the race
- * condition and the access to the object is highly performance sensitive.
- *
- * Requires:
- * mctxp != NULL && *mctxp == NULL */
- /*@}*/
-
- /*@{*/
- void
- isc_mem_attach(isc_mem_t *, isc_mem_t **);
- void
- isc_mem_detach(isc_mem_t **);
- /*!<
- * \brief Attach to / detach from a memory context.
- *
- * This is intended for applications that use multiple memory contexts
- * in such a way that it is not obvious when the last allocations from
- * a given context has been freed and destroying the context is safe.
- *
- * Most applications do not need to call these functions as they can
- * simply create a single memory context at the beginning of main()
- * and destroy it at the end of main(), thereby guaranteeing that it
- * is not destroyed while there are outstanding allocations.
- */
- /*@}*/
-
- void
- isc_mem_destroy(isc_mem_t **);
- /*%<
- * Destroy a memory context.
- */
-
- isc_result_t
- isc_mem_ondestroy(isc_mem_t *ctx,
- isc_task_t *task,
- isc_event_t **event);
- /*%<
- * Request to be notified with an event when a memory context has
- * been successfully destroyed.
- */
-
- void
- isc_mem_stats(isc_mem_t *mctx, FILE *out);
- /*%<
- * Print memory usage statistics for 'mctx' on the stream 'out'.
- */
-
- void
- isc_mem_setdestroycheck(isc_mem_t *mctx,
- isc_boolean_t on);
- /*%<
- * If 'on' is ISC_TRUE, 'mctx' will check for memory leaks when
- * destroyed and abort the program if any are present.
- */
-
- /*@{*/
- void
- isc_mem_setquota(isc_mem_t *, size_t);
- size_t
- isc_mem_getquota(isc_mem_t *);
- /*%<
- * Set/get the memory quota of 'mctx'. This is a hard limit
- * on the amount of memory that may be allocated from mctx;
- * if it is exceeded, allocations will fail.
- */
- /*@}*/
-
- size_t
- isc_mem_inuse(isc_mem_t *mctx);
- /*%<
- * Get an estimate of the number of memory in use in 'mctx', in bytes.
- * This includes quantization overhead, but does not include memory
- * allocated from the system but not yet used.
- */
-
- void
- isc_mem_setwater(isc_mem_t *mctx, isc_mem_water_t water, void *water_arg,
- size_t hiwater, size_t lowater);
- /*%<
- * Set high and low water marks for this memory context.
- *
- * When the memory
- * usage of 'mctx' exceeds 'hiwater', '(water)(water_arg, #ISC_MEM_HIWATER)'
- * will be called. When the usage drops below 'lowater', 'water' will
- * again be called, this time with #ISC_MEM_LOWATER.
- *
- * If 'water' is NULL then 'water_arg', 'hi_water' and 'lo_water' are
- * ignored and the state is reset.
- *
- * Requires:
- *
- * 'water' is not NULL.
- * hi_water >= lo_water
- */
-
- void
- isc_mem_printactive(isc_mem_t *mctx, FILE *file);
- /*%<
- * Print to 'file' all active memory in 'mctx'.
- *
- * Requires ISC_MEM_DEBUGRECORD to have been set.
- */
-
- void
- isc_mem_printallactive(FILE *file);
- /*%<
- * Print to 'file' all active memory in all contexts.
- *
- * Requires ISC_MEM_DEBUGRECORD to have been set.
- */
-
- void
- isc_mem_checkdestroyed(FILE *file);
- /*%<
- * Check that all memory contexts have been destroyed.
- * Prints out those that have not been.
- * Fatally fails if there are still active contexts.
- */
-
- /*
- * Memory pools
- */
-
- isc_result_t
- isc_mempool_create(isc_mem_t *mctx, size_t size, isc_mempool_t **mpctxp);
- /*%<
- * Create a memory pool.
- *
- * Requires:
- *\li mctx is a valid memory context.
- *\li size > 0
- *\li mpctxp != NULL and *mpctxp == NULL
- *
- * Defaults:
- *\li maxalloc = UINT_MAX
- *\li freemax = 1
- *\li fillcount = 1
- *
- * Returns:
- *\li #ISC_R_NOMEMORY -- not enough memory to create pool
- *\li #ISC_R_SUCCESS -- all is well.
- */
-
- void
- isc_mempool_destroy(isc_mempool_t **mpctxp);
- /*%<
- * Destroy a memory pool.
- *
- * Requires:
- *\li mpctxp != NULL && *mpctxp is a valid pool.
- *\li The pool has no un"put" allocations outstanding
- */
-
- void
- isc_mempool_setname(isc_mempool_t *mpctx, const char *name);
- /*%<
- * Associate a name with a memory pool. At most 15 characters may be used.
- *
- * Requires:
- *\li mpctx is a valid pool.
- *\li name != NULL;
- */
-
- void
- isc_mempool_associatelock(isc_mempool_t *mpctx, isc_mutex_t *lock);
- /*%<
- * Associate a lock with this memory pool.
- *
- * This lock is used when getting or putting items using this memory pool,
- * and it is also used to set or get internal state via the isc_mempool_get*()
- * and isc_mempool_set*() set of functions.
- *
- * Mutiple pools can each share a single lock. For instance, if "manager"
- * type object contained pools for various sizes of events, and each of
- * these pools used a common lock. Note that this lock must NEVER be used
- * by other than mempool routines once it is given to a pool, since that can
- * easily cause double locking.
- *
- * Requires:
- *
- *\li mpctpx is a valid pool.
- *
- *\li lock != NULL.
- *
- *\li No previous lock is assigned to this pool.
- *
- *\li The lock is initialized before calling this function via the normal
- * means of doing that.
- */
-
- /*
- * The following functions get/set various parameters. Note that due to
- * the unlocked nature of pools these are potentially random values unless
- * the imposed externally provided locking protocols are followed.
- *
- * Also note that the quota limits will not always take immediate effect.
- * For instance, setting "maxalloc" to a number smaller than the currently
- * allocated count is permitted. New allocations will be refused until
- * the count drops below this threshold.
- *
- * All functions require (in addition to other requirements):
- * mpctx is a valid memory pool
- */
-
- unsigned int
- isc_mempool_getfreemax(isc_mempool_t *mpctx);
- /*%<
- * Returns the maximum allowed size of the free list.
- */
-
- void
- isc_mempool_setfreemax(isc_mempool_t *mpctx, unsigned int limit);
- /*%<
- * Sets the maximum allowed size of the free list.
- */
-
- unsigned int
- isc_mempool_getfreecount(isc_mempool_t *mpctx);
- /*%<
- * Returns current size of the free list.
- */
-
- unsigned int
- isc_mempool_getmaxalloc(isc_mempool_t *mpctx);
- /*!<
- * Returns the maximum allowed number of allocations.
- */
-
- void
- isc_mempool_setmaxalloc(isc_mempool_t *mpctx, unsigned int limit);
- /*%<
- * Sets the maximum allowed number of allocations.
- *
- * Additional requirements:
- *\li limit > 0
- */
-
- unsigned int
- isc_mempool_getallocated(isc_mempool_t *mpctx);
- /*%<
- * Returns the number of items allocated from this pool.
- */
-
- unsigned int
- isc_mempool_getfillcount(isc_mempool_t *mpctx);
- /*%<
- * Returns the number of items allocated as a block from the parent memory
- * context when the free list is empty.
- */
-
- void
- isc_mempool_setfillcount(isc_mempool_t *mpctx, unsigned int limit);
- /*%<
- * Sets the fillcount.
- *
- * Additional requirements:
- *\li limit > 0
- */
-
-
- /*
- * Pseudo-private functions for use via macros. Do not call directly.
- */
- void *
- isc__mem_get(isc_mem_t *, size_t _ISC_MEM_FLARG);
- void
- isc__mem_putanddetach(isc_mem_t **, void *,
- size_t _ISC_MEM_FLARG);
- void
- isc__mem_put(isc_mem_t *, void *, size_t _ISC_MEM_FLARG);
- void *
- isc__mem_allocate(isc_mem_t *, size_t _ISC_MEM_FLARG);
- void
- isc__mem_free(isc_mem_t *, void * _ISC_MEM_FLARG);
- char *
- isc__mem_strdup(isc_mem_t *, const char *_ISC_MEM_FLARG);
- void *
- isc__mempool_get(isc_mempool_t * _ISC_MEM_FLARG);
- void
- isc__mempool_put(isc_mempool_t *, void * _ISC_MEM_FLARG);
-
- ISC_LANG_ENDDECLS
-
- #endif /* ISC_MEM_H */
-