/* * Asterisk -- An open source telephony toolkit. * * Copyright (C) 1999 - 2006, Digium, Inc. * * Mark Spencer * * See http://www.asterisk.org for more information about * the Asterisk project. Please do not directly contact * any of the maintainers of this project for assistance; * the project provides a web site, mailing lists and IRC * channels for your use. * * This program is free software, distributed under the terms of * the GNU General Public License Version 2. See the LICENSE file * at the top of the source tree. */ /*! \file * \brief General Asterisk channel locking definitions. * * - See \ref LockDef */ /*! \page LockDef Asterisk thread locking models * * This file provides different implementation of the functions, * depending on the platform, the use of DEBUG_THREADS, and the way * module-level mutexes are initialized. * * - \b static: the mutex is assigned the value AST_MUTEX_INIT_VALUE * this is done at compile time, and is the way used on Linux. * This method is not applicable to all platforms e.g. when the * initialization needs that some code is run. * * - \b through constructors: for each mutex, a constructor function is * defined, which then runs when the program (or the module) * starts. The problem with this approach is that there is a * lot of code duplication (a new block of code is created for * each mutex). Also, it does not prevent a user from declaring * a global mutex without going through the wrapper macros, * so sane programming practices are still required. */ #ifndef _ASTERISK_LOCK_H #define _ASTERISK_LOCK_H #include #include #include #include #include "asterisk/logger.h" /* internal macro to profile mutexes. Only computes the delay on * non-blocking calls. */ #ifndef HAVE_MTX_PROFILE #define __MTX_PROF(a) return pthread_mutex_lock((a)) #else #define __MTX_PROF(a) do { \ int i; \ /* profile only non-blocking events */ \ ast_mark(mtx_prof, 1); \ i = pthread_mutex_trylock((a)); \ ast_mark(mtx_prof, 0); \ if (!i) \ return i; \ else \ return pthread_mutex_lock((a)); \ } while (0) #endif /* HAVE_MTX_PROFILE */ #define AST_PTHREADT_NULL (pthread_t) -1 #define AST_PTHREADT_STOP (pthread_t) -2 #if defined(SOLARIS) || defined(BSD) #define AST_MUTEX_INIT_W_CONSTRUCTORS #endif /* SOLARIS || BSD */ /* Asterisk REQUIRES recursive (not error checking) mutexes and will not run without them. */ #if defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP) #define PTHREAD_MUTEX_INIT_VALUE PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP #define AST_MUTEX_KIND PTHREAD_MUTEX_RECURSIVE_NP #else #define PTHREAD_MUTEX_INIT_VALUE PTHREAD_MUTEX_INITIALIZER #define AST_MUTEX_KIND PTHREAD_MUTEX_RECURSIVE #endif /* PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP */ #ifdef DEBUG_THREADS #define __ast_mutex_logger(...) do { if (canlog) ast_log(LOG_ERROR, __VA_ARGS__); else fprintf(stderr, __VA_ARGS__); } while (0) #ifdef THREAD_CRASH #define DO_THREAD_CRASH do { *((int *)(0)) = 1; } while(0) #else #define DO_THREAD_CRASH do { } while (0) #endif #include #include #include #include #define AST_MUTEX_INIT_VALUE { PTHREAD_MUTEX_INIT_VALUE, { NULL }, { 0 }, 0, { NULL }, { 0 } } #define AST_MAX_REENTRANCY 10 struct ast_mutex_info { pthread_mutex_t mutex; const char *file[AST_MAX_REENTRANCY]; int lineno[AST_MAX_REENTRANCY]; int reentrancy; const char *func[AST_MAX_REENTRANCY]; pthread_t thread[AST_MAX_REENTRANCY]; }; typedef struct ast_mutex_info ast_mutex_t; typedef pthread_cond_t ast_cond_t; static pthread_mutex_t empty_mutex; static void __attribute__((constructor)) init_empty_mutex(void) { memset(&empty_mutex, 0, sizeof(empty_mutex)); } static inline int __ast_pthread_mutex_init_attr(const char *filename, int lineno, const char *func, const char *mutex_name, ast_mutex_t *t, pthread_mutexattr_t *attr) { #ifdef AST_MUTEX_INIT_W_CONSTRUCTORS int canlog = strcmp(filename, "logger.c"); if ((t->mutex) != ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) { if ((t->mutex) != (empty_mutex)) { __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is already initialized.\n", filename, lineno, func, mutex_name); __ast_mutex_logger("%s line %d (%s): Error: previously initialization of mutex '%s'.\n", t->file[0], t->lineno[0], t->func[0], mutex_name); DO_THREAD_CRASH; return 0; } } #endif t->file[0] = filename; t->lineno[0] = lineno; t->func[0] = func; t->thread[0] = 0; t->reentrancy = 0; return pthread_mutex_init(&t->mutex, attr); } static inline int __ast_pthread_mutex_init(const char *filename, int lineno, const char *func, const char *mutex_name, ast_mutex_t *t) { static pthread_mutexattr_t attr; pthread_mutexattr_init(&attr); pthread_mutexattr_settype(&attr, AST_MUTEX_KIND); return __ast_pthread_mutex_init_attr(filename, lineno, func, mutex_name, t, &attr); } #define ast_mutex_init(pmutex) __ast_pthread_mutex_init(__FILE__, __LINE__, __PRETTY_FUNCTION__, #pmutex, pmutex) static inline int __ast_pthread_mutex_destroy(const char *filename, int lineno, const char *func, const char *mutex_name, ast_mutex_t *t) { int res; int canlog = strcmp(filename, "logger.c"); #ifdef AST_MUTEX_INIT_W_CONSTRUCTORS if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) { __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n", filename, lineno, func, mutex_name); } #endif res = pthread_mutex_trylock(&t->mutex); switch (res) { case 0: pthread_mutex_unlock(&t->mutex); break; case EINVAL: __ast_mutex_logger("%s line %d (%s): Error: attempt to destroy invalid mutex '%s'.\n", filename, lineno, func, mutex_name); break; case EBUSY: __ast_mutex_logger("%s line %d (%s): Error: attempt to destroy locked mutex '%s'.\n", filename, lineno, func, mutex_name); __ast_mutex_logger("%s line %d (%s): Error: '%s' was locked here.\n", t->file[t->reentrancy-1], t->lineno[t->reentrancy-1], t->func[t->reentrancy-1], mutex_name); break; } if ((res = pthread_mutex_destroy(&t->mutex))) __ast_mutex_logger("%s line %d (%s): Error destroying mutex: %s\n", filename, lineno, func, strerror(res)); #ifndef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP else t->mutex = PTHREAD_MUTEX_INIT_VALUE; #endif t->file[0] = filename; t->lineno[0] = lineno; t->func[0] = func; return res; } static inline int __ast_pthread_mutex_lock(const char *filename, int lineno, const char *func, const char* mutex_name, ast_mutex_t *t) { int res; int canlog = strcmp(filename, "logger.c"); #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) { __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n", filename, lineno, func, mutex_name); ast_mutex_init(t); } #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */ #ifdef DETECT_DEADLOCKS { time_t seconds = time(NULL); time_t current; do { #ifdef HAVE_MTX_PROFILE ast_mark(mtx_prof, 1); #endif res = pthread_mutex_trylock(&t->mutex); #ifdef HAVE_MTX_PROFILE ast_mark(mtx_prof, 0); #endif if (res == EBUSY) { current = time(NULL); if ((current - seconds) && (!((current - seconds) % 5))) { __ast_mutex_logger("%s line %d (%s): Deadlock? waited %d sec for mutex '%s'?\n", filename, lineno, func, (int)(current - seconds), mutex_name); __ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n", t->file[t->reentrancy-1], t->lineno[t->reentrancy-1], t->func[t->reentrancy-1], mutex_name); } usleep(200); } } while (res == EBUSY); } #else #ifdef HAVE_MTX_PROFILE ast_mark(mtx_prof, 1); res = pthread_mutex_trylock(&t->mutex); ast_mark(mtx_prof, 0); if (res) #endif res = pthread_mutex_lock(&t->mutex); #endif /* DETECT_DEADLOCKS */ if (!res) { if (t->reentrancy < AST_MAX_REENTRANCY) { t->file[t->reentrancy] = filename; t->lineno[t->reentrancy] = lineno; t->func[t->reentrancy] = func; t->thread[t->reentrancy] = pthread_self(); t->reentrancy++; } else { __ast_mutex_logger("%s line %d (%s): '%s' really deep reentrancy!\n", filename, lineno, func, mutex_name); } } else { __ast_mutex_logger("%s line %d (%s): Error obtaining mutex: %s\n", filename, lineno, func, strerror(errno)); DO_THREAD_CRASH; } return res; } static inline int __ast_pthread_mutex_trylock(const char *filename, int lineno, const char *func, const char* mutex_name, ast_mutex_t *t) { int res; int canlog = strcmp(filename, "logger.c"); #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) { __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n", filename, lineno, func, mutex_name); ast_mutex_init(t); } #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */ if (!(res = pthread_mutex_trylock(&t->mutex))) { if (t->reentrancy < AST_MAX_REENTRANCY) { t->file[t->reentrancy] = filename; t->lineno[t->reentrancy] = lineno; t->func[t->reentrancy] = func; t->thread[t->reentrancy] = pthread_self(); t->reentrancy++; } else { __ast_mutex_logger("%s line %d (%s): '%s' really deep reentrancy!\n", filename, lineno, func, mutex_name); } } return res; } static inline int __ast_pthread_mutex_unlock(const char *filename, int lineno, const char *func, const char *mutex_name, ast_mutex_t *t) { int res; int canlog = strcmp(filename, "logger.c"); #ifdef AST_MUTEX_INIT_W_CONSTRUCTORS if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) { __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n", filename, lineno, func, mutex_name); } #endif if (t->reentrancy && (t->thread[t->reentrancy-1] != pthread_self())) { __ast_mutex_logger("%s line %d (%s): attempted unlock mutex '%s' without owning it!\n", filename, lineno, func, mutex_name); __ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n", t->file[t->reentrancy-1], t->lineno[t->reentrancy-1], t->func[t->reentrancy-1], mutex_name); DO_THREAD_CRASH; } if (--t->reentrancy < 0) { __ast_mutex_logger("%s line %d (%s): mutex '%s' freed more times than we've locked!\n", filename, lineno, func, mutex_name); t->reentrancy = 0; } if (t->reentrancy < AST_MAX_REENTRANCY) { t->file[t->reentrancy] = NULL; t->lineno[t->reentrancy] = 0; t->func[t->reentrancy] = NULL; t->thread[t->reentrancy] = 0; } if ((res = pthread_mutex_unlock(&t->mutex))) { __ast_mutex_logger("%s line %d (%s): Error releasing mutex: %s\n", filename, lineno, func, strerror(res)); DO_THREAD_CRASH; } return res; } static inline int __ast_cond_init(const char *filename, int lineno, const char *func, const char *cond_name, ast_cond_t *cond, pthread_condattr_t *cond_attr) { return pthread_cond_init(cond, cond_attr); } static inline int __ast_cond_signal(const char *filename, int lineno, const char *func, const char *cond_name, ast_cond_t *cond) { return pthread_cond_signal(cond); } static inline int __ast_cond_broadcast(const char *filename, int lineno, const char *func, const char *cond_name, ast_cond_t *cond) { return pthread_cond_broadcast(cond); } static inline int __ast_cond_destroy(const char *filename, int lineno, const char *func, const char *cond_name, ast_cond_t *cond) { return pthread_cond_destroy(cond); } static inline int __ast_cond_wait(const char *filename, int lineno, const char *func, const char *cond_name, const char *mutex_name, ast_cond_t *cond, ast_mutex_t *t) { int res; int canlog = strcmp(filename, "logger.c"); #ifdef AST_MUTEX_INIT_W_CONSTRUCTORS if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) { __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n", filename, lineno, func, mutex_name); } #endif if (t->reentrancy && (t->thread[t->reentrancy-1] != pthread_self())) { __ast_mutex_logger("%s line %d (%s): attempted unlock mutex '%s' without owning it!\n", filename, lineno, func, mutex_name); __ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n", t->file[t->reentrancy-1], t->lineno[t->reentrancy-1], t->func[t->reentrancy-1], mutex_name); DO_THREAD_CRASH; } if (--t->reentrancy < 0) { __ast_mutex_logger("%s line %d (%s): mutex '%s' freed more times than we've locked!\n", filename, lineno, func, mutex_name); t->reentrancy = 0; } if (t->reentrancy < AST_MAX_REENTRANCY) { t->file[t->reentrancy] = NULL; t->lineno[t->reentrancy] = 0; t->func[t->reentrancy] = NULL; t->thread[t->reentrancy] = 0; } if ((res = pthread_cond_wait(cond, &t->mutex))) { __ast_mutex_logger("%s line %d (%s): Error waiting on condition mutex '%s'\n", filename, lineno, func, strerror(res)); DO_THREAD_CRASH; } else { if (t->reentrancy < AST_MAX_REENTRANCY) { t->file[t->reentrancy] = filename; t->lineno[t->reentrancy] = lineno; t->func[t->reentrancy] = func; t->thread[t->reentrancy] = pthread_self(); t->reentrancy++; } else { __ast_mutex_logger("%s line %d (%s): '%s' really deep reentrancy!\n", filename, lineno, func, mutex_name); } } return res; } static inline int __ast_cond_timedwait(const char *filename, int lineno, const char *func, const char *cond_name, const char *mutex_name, ast_cond_t *cond, ast_mutex_t *t, const struct timespec *abstime) { int res; int canlog = strcmp(filename, "logger.c"); #ifdef AST_MUTEX_INIT_W_CONSTRUCTORS if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) { __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n", filename, lineno, func, mutex_name); } #endif if (t->reentrancy && (t->thread[t->reentrancy-1] != pthread_self())) { __ast_mutex_logger("%s line %d (%s): attempted unlock mutex '%s' without owning it!\n", filename, lineno, func, mutex_name); __ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n", t->file[t->reentrancy-1], t->lineno[t->reentrancy-1], t->func[t->reentrancy-1], mutex_name); DO_THREAD_CRASH; } if (--t->reentrancy < 0) { __ast_mutex_logger("%s line %d (%s): mutex '%s' freed more times than we've locked!\n", filename, lineno, func, mutex_name); t->reentrancy = 0; } if (t->reentrancy < AST_MAX_REENTRANCY) { t->file[t->reentrancy] = NULL; t->lineno[t->reentrancy] = 0; t->func[t->reentrancy] = NULL; t->thread[t->reentrancy] = 0; } if ((res = pthread_cond_timedwait(cond, &t->mutex, abstime)) && (res != ETIMEDOUT)) { __ast_mutex_logger("%s line %d (%s): Error waiting on condition mutex '%s'\n", filename, lineno, func, strerror(res)); DO_THREAD_CRASH; } else { if (t->reentrancy < AST_MAX_REENTRANCY) { t->file[t->reentrancy] = filename; t->lineno[t->reentrancy] = lineno; t->func[t->reentrancy] = func; t->thread[t->reentrancy] = pthread_self(); t->reentrancy++; } else { __ast_mutex_logger("%s line %d (%s): '%s' really deep reentrancy!\n", filename, lineno, func, mutex_name); } } return res; } #define ast_mutex_destroy(a) __ast_pthread_mutex_destroy(__FILE__, __LINE__, __PRETTY_FUNCTION__, #a, a) #define ast_mutex_lock(a) __ast_pthread_mutex_lock(__FILE__, __LINE__, __PRETTY_FUNCTION__, #a, a) #define ast_mutex_unlock(a) __ast_pthread_mutex_unlock(__FILE__, __LINE__, __PRETTY_FUNCTION__, #a, a) #define ast_mutex_trylock(a) __ast_pthread_mutex_trylock(__FILE__, __LINE__, __PRETTY_FUNCTION__, #a, a) #define ast_cond_init(cond, attr) __ast_cond_init(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, cond, attr) #define ast_cond_destroy(cond) __ast_cond_destroy(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, cond) #define ast_cond_signal(cond) __ast_cond_signal(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, cond) #define ast_cond_broadcast(cond) __ast_cond_broadcast(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, cond) #define ast_cond_wait(cond, mutex) __ast_cond_wait(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, #mutex, cond, mutex) #define ast_cond_timedwait(cond, mutex, time) __ast_cond_timedwait(__FILE__, __LINE__, __PRETTY_FUNCTION__, #cond, #mutex, cond, mutex, time) #else /* !DEBUG_THREADS */ typedef pthread_mutex_t ast_mutex_t; #define AST_MUTEX_INIT_VALUE ((ast_mutex_t) PTHREAD_MUTEX_INIT_VALUE) static inline int ast_mutex_init(ast_mutex_t *pmutex) { pthread_mutexattr_t attr; pthread_mutexattr_init(&attr); pthread_mutexattr_settype(&attr, AST_MUTEX_KIND); return pthread_mutex_init(pmutex, &attr); } #define ast_pthread_mutex_init(pmutex,a) pthread_mutex_init(pmutex,a) static inline int ast_mutex_unlock(ast_mutex_t *pmutex) { return pthread_mutex_unlock(pmutex); } static inline int ast_mutex_destroy(ast_mutex_t *pmutex) { return pthread_mutex_destroy(pmutex); } static inline int ast_mutex_lock(ast_mutex_t *pmutex) { __MTX_PROF(pmutex); } static inline int ast_mutex_trylock(ast_mutex_t *pmutex) { return pthread_mutex_trylock(pmutex); } typedef pthread_cond_t ast_cond_t; static inline int ast_cond_init(ast_cond_t *cond, pthread_condattr_t *cond_attr) { return pthread_cond_init(cond, cond_attr); } static inline int ast_cond_signal(ast_cond_t *cond) { return pthread_cond_signal(cond); } static inline int ast_cond_broadcast(ast_cond_t *cond) { return pthread_cond_broadcast(cond); } static inline int ast_cond_destroy(ast_cond_t *cond) { return pthread_cond_destroy(cond); } static inline int ast_cond_wait(ast_cond_t *cond, ast_mutex_t *t) { return pthread_cond_wait(cond, t); } static inline int ast_cond_timedwait(ast_cond_t *cond, ast_mutex_t *t, const struct timespec *abstime) { return pthread_cond_timedwait(cond, t, abstime); } #endif /* !DEBUG_THREADS */ #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) /* If AST_MUTEX_INIT_W_CONSTRUCTORS is defined, use file scope constructors/destructors to create/destroy mutexes. */ #define __AST_MUTEX_DEFINE(scope, mutex) \ scope ast_mutex_t mutex = AST_MUTEX_INIT_VALUE; \ static void __attribute__ ((constructor)) init_##mutex(void) \ { \ ast_mutex_init(&mutex); \ } \ static void __attribute__ ((destructor)) fini_##mutex(void) \ { \ ast_mutex_destroy(&mutex); \ } #else /* !AST_MUTEX_INIT_W_CONSTRUCTORS */ /* By default, use static initialization of mutexes. */ #define __AST_MUTEX_DEFINE(scope, mutex) \ scope ast_mutex_t mutex = AST_MUTEX_INIT_VALUE #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */ #define pthread_mutex_t use_ast_mutex_t_instead_of_pthread_mutex_t #define pthread_mutex_lock use_ast_mutex_lock_instead_of_pthread_mutex_lock #define pthread_mutex_unlock use_ast_mutex_unlock_instead_of_pthread_mutex_unlock #define pthread_mutex_trylock use_ast_mutex_trylock_instead_of_pthread_mutex_trylock #define pthread_mutex_init use_ast_mutex_init_instead_of_pthread_mutex_init #define pthread_mutex_destroy use_ast_mutex_destroy_instead_of_pthread_mutex_destroy #define pthread_cond_t use_ast_cond_t_instead_of_pthread_cond_t #define pthread_cond_init use_ast_cond_init_instead_of_pthread_cond_init #define pthread_cond_destroy use_ast_cond_destroy_instead_of_pthread_cond_destroy #define pthread_cond_signal use_ast_cond_signal_instead_of_pthread_cond_signal #define pthread_cond_broadcast use_ast_cond_broadcast_instead_of_pthread_cond_broadcast #define pthread_cond_wait use_ast_cond_wait_instead_of_pthread_cond_wait #define pthread_cond_timedwait use_ast_cond_timedwait_instead_of_pthread_cond_timedwait #define AST_MUTEX_DEFINE_STATIC(mutex) __AST_MUTEX_DEFINE(static, mutex) #define AST_MUTEX_INITIALIZER __use_AST_MUTEX_DEFINE_STATIC_rather_than_AST_MUTEX_INITIALIZER__ #define gethostbyname __gethostbyname__is__not__reentrant__use__ast_gethostbyname__instead__ #ifndef __linux__ #define pthread_create __use_ast_pthread_create_instead__ #endif typedef pthread_rwlock_t ast_rwlock_t; static inline int ast_rwlock_init(ast_rwlock_t *prwlock) { pthread_rwlockattr_t attr; pthread_rwlockattr_init(&attr); #ifdef HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP pthread_rwlockattr_setkind_np(&attr, PTHREAD_RWLOCK_PREFER_WRITER_NP); #endif return pthread_rwlock_init(prwlock, &attr); } static inline int ast_rwlock_destroy(ast_rwlock_t *prwlock) { return pthread_rwlock_destroy(prwlock); } static inline int ast_rwlock_unlock(ast_rwlock_t *prwlock) { return pthread_rwlock_unlock(prwlock); } static inline int ast_rwlock_rdlock(ast_rwlock_t *prwlock) { return pthread_rwlock_rdlock(prwlock); } static inline int ast_rwlock_tryrdlock(ast_rwlock_t *prwlock) { return pthread_rwlock_tryrdlock(prwlock); } static inline int ast_rwlock_wrlock(ast_rwlock_t *prwlock) { return pthread_rwlock_wrlock(prwlock); } static inline int ast_rwlock_trywrlock(ast_rwlock_t *prwlock) { return pthread_rwlock_trywrlock(prwlock); } /* Statically declared read/write locks */ #ifndef HAVE_PTHREAD_RWLOCK_INITIALIZER #define __AST_RWLOCK_DEFINE(scope, rwlock) \ scope ast_rwlock_t rwlock; \ static void __attribute__ ((constructor)) init_##rwlock(void) \ { \ ast_rwlock_init(&rwlock); \ } \ static void __attribute__ ((destructor)) fini_##rwlock(void) \ { \ ast_rwlock_destroy(&rwlock); \ } #else #define AST_RWLOCK_INIT_VALUE PTHREAD_RWLOCK_INITIALIZER #define __AST_RWLOCK_DEFINE(scope, rwlock) \ scope ast_rwlock_t rwlock = AST_RWLOCK_INIT_VALUE #endif #define AST_RWLOCK_DEFINE_STATIC(rwlock) __AST_RWLOCK_DEFINE(static, rwlock) /* * Initial support for atomic instructions. * For platforms that have it, use the native cpu instruction to * implement them. For other platforms, resort to a 'slow' version * (defined in utils.c) that protects the atomic instruction with * a single lock. * The slow versions is always available, for testing purposes, * as ast_atomic_fetchadd_int_slow() */ int ast_atomic_fetchadd_int_slow(volatile int *p, int v); #include "asterisk/inline_api.h" #if defined(HAVE_OSX_ATOMICS) #include "libkern/OSAtomic.h" #endif /*! \brief Atomically add v to *p and return * the previous value of *p. * This can be used to handle reference counts, and the return value * can be used to generate unique identifiers. */ #if defined(HAVE_GCC_ATOMICS) AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v), { return __sync_fetch_and_add(p, v); }) #elif defined(HAVE_OSX_ATOMICS) && (SIZEOF_INT == 4) AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v), { return OSAtomicAdd32(v, (int32_t *) p); }) #elif defined(HAVE_OSX_ATOMICS) && (SIZEOF_INT == 8) AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v), { return OSAtomicAdd64(v, (int64_t *) p); #elif defined (__i386__) AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v), { __asm __volatile ( " lock xaddl %0, %1 ; " : "+r" (v), /* 0 (result) */ "=m" (*p) /* 1 */ : "m" (*p)); /* 2 */ return (v); }) #else /* low performance version in utils.c */ AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v), { return ast_atomic_fetchadd_int_slow(p, v); }) #endif /*! \brief decrement *p by 1 and return true if the variable has reached 0. * Useful e.g. to check if a refcount has reached 0. */ #if defined(HAVE_GCC_ATOMICS) AST_INLINE_API(int ast_atomic_dec_and_test(volatile int *p), { return __sync_sub_and_fetch(p, 1) == 0; }) #elif defined(HAVE_OSX_ATOMICS) && (SIZEOF_INT == 4) AST_INLINE_API(int ast_atomic_dec_and_test(volatile int *p), { return OSAtomicAdd32( -1, (int32_t *) p) == 0; }) #elif defined(HAVE_OSX_ATOMICS) && (SIZEOF_INT == 8) AST_INLINE_API(int ast_atomic_dec_and_test(volatile int *p), { return OSAtomicAdd64( -1, (int64_t *) p) == 0; #else AST_INLINE_API(int ast_atomic_dec_and_test(volatile int *p), { int a = ast_atomic_fetchadd_int(p, -1); return a == 1; /* true if the value is 0 now (so it was 1 previously) */ }) #endif #ifndef DEBUG_CHANNEL_LOCKS /*! \brief Lock a channel. If DEBUG_CHANNEL_LOCKS is defined in the Makefile, print relevant output for debugging */ #define ast_channel_lock(x) ast_mutex_lock(&x->lock) /*! \brief Unlock a channel. If DEBUG_CHANNEL_LOCKS is defined in the Makefile, print relevant output for debugging */ #define ast_channel_unlock(x) ast_mutex_unlock(&x->lock) /*! \brief Try locking a channel. If DEBUG_CHANNEL_LOCKS is defined in the Makefile, print relevant output for debugging */ #define ast_channel_trylock(x) ast_mutex_trylock(&x->lock) #else struct ast_channel; /*! \brief Lock AST channel (and print debugging output) \note You need to enable DEBUG_CHANNEL_LOCKS for this function */ int ast_channel_lock(struct ast_channel *chan); /*! \brief Unlock AST channel (and print debugging output) \note You need to enable DEBUG_CHANNEL_LOCKS for this function */ int ast_channel_unlock(struct ast_channel *chan); /*! \brief Lock AST channel (and print debugging output) \note You need to enable DEBUG_CHANNEL_LOCKS for this function */ int ast_channel_trylock(struct ast_channel *chan); #endif #endif /* _ASTERISK_LOCK_H */