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mem.h
/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * 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 https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef ISC_MEM_H #define ISC_MEM_H 1 /*! \file isc/mem.h */ #include <stdbool.h> #include <stdio.h> #include <isc/json.h> #include <isc/lang.h> #include <isc/mutex.h> #include <isc/platform.h> #include <isc/types.h> #include <isc/xml.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_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. * * If we are performing a Coverity static analysis then ISC_MEM_CHECKOVERRUN * can hide bugs that would otherwise discovered so force to zero. */ #ifdef __COVERITY__ #undef ISC_MEM_CHECKOVERRUN #define ISC_MEM_CHECKOVERRUN 0 #endif #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. * * If we are performing a Coverity static analysis then ISC_MEM_FILL * can hide bugs that would otherwise discovered so force to zero. */ #ifdef __COVERITY__ #undef ISC_MEM_FILL #define ISC_MEM_FILL 0 #endif #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; LIBISC_EXTERNAL_DATA extern unsigned int isc_mem_defaultflags; /*@{*/ #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. It is initialized 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 maximum 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 *, unsigned 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 /*%< * We use either isc___mem (three underscores) or isc__mem (two) depending on * whether it's for BIND9's internal purpose (with -DBIND9) or generic export * library. */ #define ISCMEMFUNC(sfx) isc__mem_ ## sfx #define ISCMEMPOOLFUNC(sfx) isc__mempool_ ## sfx #define isc_mem_get(c, s) ISCMEMFUNC(get)((c), (s) _ISC_MEM_FILELINE) #define isc_mem_allocate(c, s) ISCMEMFUNC(allocate)((c), (s) _ISC_MEM_FILELINE) #define isc_mem_reallocate(c, p, s) ISCMEMFUNC(reallocate)((c), (p), (s) _ISC_MEM_FILELINE) #define isc_mem_strdup(c, p) ISCMEMFUNC(strdup)((c), (p) _ISC_MEM_FILELINE) #define isc_mempool_get(c) ISCMEMPOOLFUNC(get)((c) _ISC_MEM_FILELINE) /*% * isc_mem_putanddetach() is a convenience 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 */ /*% memory and memory pool methods */ typedef struct isc_memmethods { void (*attach)(isc_mem_t *source, isc_mem_t **targetp); void (*detach)(isc_mem_t **mctxp); void (*destroy)(isc_mem_t **mctxp); void *(*memget)(isc_mem_t *mctx, size_t size _ISC_MEM_FLARG); void (*memput)(isc_mem_t *mctx, void *ptr, size_t size _ISC_MEM_FLARG); void (*memputanddetach)(isc_mem_t **mctxp, void *ptr, size_t size _ISC_MEM_FLARG); void *(*memallocate)(isc_mem_t *mctx, size_t size _ISC_MEM_FLARG); void *(*memreallocate)(isc_mem_t *mctx, void *ptr, size_t size _ISC_MEM_FLARG); char *(*memstrdup)(isc_mem_t *mctx, const char *s _ISC_MEM_FLARG); void (*memfree)(isc_mem_t *mctx, void *ptr _ISC_MEM_FLARG); void (*setdestroycheck)(isc_mem_t *mctx, bool flag); void (*setwater)(isc_mem_t *ctx, isc_mem_water_t water, void *water_arg, size_t hiwater, size_t lowater); void (*waterack)(isc_mem_t *ctx, int flag); size_t (*inuse)(isc_mem_t *mctx); size_t (*maxinuse)(isc_mem_t *mctx); size_t (*total)(isc_mem_t *mctx); bool (*isovermem)(isc_mem_t *mctx); isc_result_t (*mpcreate)(isc_mem_t *mctx, size_t size, isc_mempool_t **mpctxp); } isc_memmethods_t; typedef struct isc_mempoolmethods { void (*destroy)(isc_mempool_t **mpctxp); void *(*get)(isc_mempool_t *mpctx _ISC_MEM_FLARG); void (*put)(isc_mempool_t *mpctx, void *mem _ISC_MEM_FLARG); unsigned int (*getallocated)(isc_mempool_t *mpctx); void (*setmaxalloc)(isc_mempool_t *mpctx, unsigned int limit); void (*setfreemax)(isc_mempool_t *mpctx, unsigned int limit); void (*setname)(isc_mempool_t *mpctx, const char *name); void (*associatelock)(isc_mempool_t *mpctx, isc_mutex_t *lock); void (*setfillcount)(isc_mempool_t *mpctx, unsigned int limit); } isc_mempoolmethods_t; /*% * This structure is actually just the common prefix of a memory context * implementation's version of an isc_mem_t. * \brief * Direct use of this structure by clients is forbidden. mctx implementations * may change the structure. 'magic' must be ISCAPI_MCTX_MAGIC for any of the * isc_mem_ routines to work. mctx implementations must maintain all mctx * invariants. */ struct isc_mem { unsigned int impmagic; unsigned int magic; isc_memmethods_t *methods; }; #define ISCAPI_MCTX_MAGIC ISC_MAGIC('A','m','c','x') #define ISCAPI_MCTX_VALID(m) ((m) != NULL && \ (m)->magic == ISCAPI_MCTX_MAGIC) /*% * This is the common prefix of a memory pool context. The same note as * that for the mem structure applies. */ struct isc_mempool { unsigned int impmagic; unsigned int magic; isc_mempoolmethods_t *methods; }; #define ISCAPI_MPOOL_MAGIC ISC_MAGIC('A','m','p','l') #define ISCAPI_MPOOL_VALID(mp) ((mp) != NULL && \ (mp)->magic == ISCAPI_MPOOL_MAGIC) #define isc_mem_put(c, p, s) \ do { \ ISCMEMFUNC(put)((c), (p), (s) _ISC_MEM_FILELINE); \ (p) = NULL; \ } while (0) #define isc_mem_putanddetach(c, p, s) \ do { \ ISCMEMFUNC(putanddetach)((c), (p), (s) _ISC_MEM_FILELINE); \ (p) = NULL; \ } while (0) #define isc_mem_free(c, p) \ do { \ ISCMEMFUNC(free)((c), (p) _ISC_MEM_FILELINE); \ (p) = NULL; \ } while (0) #define isc_mempool_put(c, p) \ do { \ ISCMEMPOOLFUNC(put)((c), (p) _ISC_MEM_FILELINE); \ (p) = NULL; \ } while (0) /*@{*/ 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. Setting * '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, bool on); /*%< * If 'on' is 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 amount 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. */ size_t isc_mem_maxinuse(isc_mem_t *mctx); /*%< * Get an estimate of the largest amount of memory that has been in * use in 'mctx' at any time. */ size_t isc_mem_total(isc_mem_t *mctx); /*%< * Get the total amount of memory in 'mctx', in bytes, including memory * not yet used. */ bool isc_mem_isovermem(isc_mem_t *mctx); /*%< * Return true iff the memory context is in "over memory" state, i.e., * a hiwater mark has been set and the used amount of memory has exceeds * the mark. */ 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. 'water' needs to * call isc_mem_waterack() with #ISC_MEM_HIWATER to acknowledge the state * change. 'water' may be called multiple times. * * When the usage drops below 'lowater', 'water' will again be called, this * time with #ISC_MEM_LOWATER. 'water' need to calls isc_mem_waterack() with * #ISC_MEM_LOWATER to acknowledge the change. * * static void * water(void *arg, int mark) { * struct foo *foo = arg; * * LOCK(&foo->marklock); * if (foo->mark != mark) { * foo->mark = mark; * .... * isc_mem_waterack(foo->mctx, mark); * } * UNLOCK(&foo->marklock); * } * * 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_waterack(isc_mem_t *ctx, int mark); /*%< * Called to acknowledge changes in signaled by calls to '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. */ unsigned int isc_mem_references(isc_mem_t *ctx); /*%< * Return the current reference count. */ void isc_mem_setname(isc_mem_t *ctx, const char *name, void *tag); /*%< * Name 'ctx'. * * Notes: * *\li Only the first 15 characters of 'name' will be copied. * *\li 'tag' is for debugging purposes only. * * Requires: * *\li 'ctx' is a valid ctx. */ const char * isc_mem_getname(isc_mem_t *ctx); /*%< * Get the name of 'ctx', as previously set using isc_mem_setname(). * * Requires: *\li 'ctx' is a valid ctx. * * Returns: *\li A non-NULL pointer to a null-terminated string. * If the ctx has not been named, the string is * empty. */ void * isc_mem_gettag(isc_mem_t *ctx); /*%< * Get the tag value for 'task', as previously set using isc_mem_setname(). * * Requires: *\li 'ctx' is a valid ctx. * * Notes: *\li This function is for debugging purposes only. * * Requires: *\li 'ctx' is a valid task. */ #ifdef HAVE_LIBXML2 int isc_mem_renderxml(xmlTextWriterPtr writer); /*%< * Render all contexts' statistics and status in XML for writer. */ #endif /* HAVE_LIBXML2 */ #ifdef HAVE_JSON isc_result_t isc_mem_renderjson(json_object *memobj); /*%< * Render all contexts' statistics and status in JSON. */ #endif /* HAVE_JSON */ /* * 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. * * Multiple 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 * ISCMEMFUNC(get)(isc_mem_t *, size_t _ISC_MEM_FLARG); void ISCMEMFUNC(putanddetach)(isc_mem_t **, void *, size_t _ISC_MEM_FLARG); void ISCMEMFUNC(put)(isc_mem_t *, void *, size_t _ISC_MEM_FLARG); void * ISCMEMFUNC(allocate)(isc_mem_t *, size_t _ISC_MEM_FLARG); void * ISCMEMFUNC(reallocate)(isc_mem_t *, void *, size_t _ISC_MEM_FLARG); void ISCMEMFUNC(free)(isc_mem_t *, void * _ISC_MEM_FLARG); char * ISCMEMFUNC(strdup)(isc_mem_t *, const char *_ISC_MEM_FLARG); void * ISCMEMPOOLFUNC(get)(isc_mempool_t * _ISC_MEM_FLARG); void ISCMEMPOOLFUNC(put)(isc_mempool_t *, void * _ISC_MEM_FLARG); /*%< * See isc_mem_create2() above. */ typedef isc_result_t (*isc_memcreatefunc_t)(size_t init_max_size, size_t target_size, isc_mem_t **ctxp, unsigned int flags); isc_result_t isc_mem_register(isc_memcreatefunc_t createfunc); /*%< * Register a new memory management implementation and add it to the list of * supported implementations. This function must be called when a different * memory management library is used than the one contained in the ISC library. */ isc_result_t isc__mem_register(void); /*%< * A short cut function that specifies the memory management module in the ISC * library for isc_mem_register(). An application that uses the ISC library * usually do not have to care about this function: it would call * isc_lib_register(), which internally calls this function. */ ISC_LANG_ENDDECLS #endif /* ISC_MEM_H */
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