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/*
* Asterisk -- A telephony toolkit for Linux.
*
* General Asterisk channel definitions.
*
* Copyright (C) 1999, Mark Spencer
*
* Mark Spencer <markster@linux-support.net>
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*/
#ifndef _ASTERISK_LOCK_H
#define _ASTERISK_LOCK_H
#include <pthread.h>
#include <netdb.h>
#define AST_PTHREADT_NULL (pthread_t) -1
#define AST_PTHREADT_STOP (pthread_t) -2
#ifdef __APPLE__
/* Provide the Linux initializers for MacOS X */
#define PTHREAD_MUTEX_RECURSIVE_NP PTHREAD_MUTEX_RECURSIVE
#define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP { 0x4d555458, \
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
0x20 } }
#endif
#ifdef __FreeBSD__
#ifdef __GNUC__
#define AST_MUTEX_INIT_W_CONSTRUCTORS
#else
#define AST_MUTEX_INIT_ON_FIRST_USE
#endif
#endif /* __FreeBSD__ */
#ifdef DEBUG_THREADS
#ifdef THREAD_CRASH
#define DO_THREAD_CRASH do { *((int *)(0)) = 1; } while(0)
#endif
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
/* From now on, Asterisk REQUIRES Recursive (not error checking) mutexes
and will not run without them. */
#ifdef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
#define AST_MUTEX_INIT_VAULE { PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP, NULL, 0, NULL, 0 }
#else
#define AST_MUTEX_INIT_VAULE { PTHREAD_MUTEX_INITIALIZER, NULL, 0, NULL, 0 }
#endif
#ifdef PTHREAD_MUTEX_RECURSIVE_NP
#define AST_MUTEX_KIND PTHREAD_MUTEX_RECURSIVE_NP
#else
#define AST_MUTEX_KIND PTHREAD_MUTEX_RECURSIVE
#endif
struct ast_mutex_info {
pthread_mutex_t mutex;
char *file;
int lineno;
char *func;
pthread_t thread;
};
typedef struct ast_mutex_info ast_mutex_t;
static inline int ast_pthread_mutex_init(ast_mutex_t *t, pthread_mutexattr_t *attr)
{
t->file = NULL;
t->lineno = 0;
t->func = 0;
t->thread = 0;
return pthread_mutex_init(&t->mutex, attr);
}
static inline int ast_mutex_init(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(t, &attr);
}
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS)
/* if AST_MUTEX_INIT_W_CONSTRUCTORS is defined, use file scope
constrictors/destructors to create/destroy mutexes. */
#define __AST_MUTEX_DEFINE(scope,mutex) \
scope ast_mutex_t mutex = AST_MUTEX_INIT_VAULE; \
static void __attribute__ ((constructor)) init_##mutex(void) \
{ \
ast_mutex_init(&mutex); \
} \
static void __attribute__ ((destructor)) fini_##mutex(void) \
{ \
ast_mutex_destroy(&mutex); \
}
#elif defined(AST_MUTEX_INIT_ON_FIRST_USE) || !defined(AST_MUTEX_INIT_W_CONSTRUCTORS)
/* if AST_MUTEX_INIT_ON_FIRST_USE is defined, mutexes are created on
first use. The performance impact on FreeBSD should be small since
the pthreads library does this itself to initialize errror checking
(defaulty type) mutexes. If nither is defined, the pthreads librariy
does the initialization itself on first use. */
#define __AST_MUTEX_DEFINE(scope,mutex) \
scope ast_mutex_t mutex = AST_MUTEX_INIT_VAULE
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
static inline int __ast_pthread_mutex_lock(char *filename, int lineno, char *func, ast_mutex_t *t)
{
int res;
#ifdef AST_MUTEX_INIT_ON_FIRST_USE
if(*t->mutex == (ast_mutex_t)AST_MUTEX_KIND)
ast_mutex_init(t->mutex);
#endif
res = pthread_mutex_lock(&t->mutex);
if (!res) {
t->file = filename;
t->lineno = lineno;
t->func = func;
t->thread = pthread_self();
} else {
fprintf(stderr, "%s line %d (%s): Error obtaining mutex: %s\n",
filename, lineno, func, strerror(errno));
#ifdef THREAD_CRASH
DO_THREAD_CRASH;
#endif
}
return res;
}
#define ast_mutex_lock(a) __ast_pthread_mutex_lock(__FILE__, __LINE__, __PRETTY_FUNCTION__, a)
static inline int __ast_pthread_mutex_trylock(char *filename, int lineno, char *func, ast_mutex_t *t) {
int res;
#ifdef AST_MUTEX_INIT_ON_FIRST_USE
if(*t->mutex == (ast_mutex_t)AST_MUTEX_KIND)
ast_mutex_init(t->mutex);
#endif
res = pthread_mutex_trylock(&t->mutex);
if (!res) {
t->file = filename;
t->lineno = lineno;
t->func = func;
t->thread = pthread_self();
}
return res;
}
#define ast_mutex_trylock(a) __ast_pthread_mutex_trylock(__FILE__, __LINE__, __PRETTY_FUNCTION__, a)
static inline int __ast_pthread_mutex_unlock(char *filename, int lineno, char *func, ast_mutex_t *t) {
int res;
/* Assumes lock is actually held */
t->file = NULL;
t->lineno = 0;
t->func = NULL;
t->thread = 0;
res = pthread_mutex_unlock(&t->mutex);
if (res) {
fprintf(stderr, "%s line %d (%s): Error releasing mutex: %s\n",
filename, lineno, func, strerror(res));
#ifdef THREAD_CRASH
DO_THREAD_CRASH;
#endif
}
return res;
}
#define ast_mutex_unlock(a) __ast_pthread_mutex_unlock(__FILE__, __LINE__, __PRETTY_FUNCTION__, a)
static inline int __ast_pthread_mutex_destroy(char *filename, int lineno, char *func, ast_mutex_t *t)
{
int res;
t->file = NULL;
t->lineno = 0;
t->func = NULL;
t->thread = 0;
res = pthread_mutex_destroy(&t->mutex);
if (res)
fprintf(stderr, "%s line %d (%s): Error destroying mutex: %s\n",
filename, lineno, func, strerror(res));
return res;
}
#define ast_mutex_destroy(a) __ast_pthread_mutex_destroy(__FILE__, __LINE__, __PRETTY_FUNCTION__, a)
#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_pthread_mutex_init_instead_of_pthread_mutex_init
#define pthread_mutex_destroy use_ast_pthread_mutex_destroy_instead_of_pthread_mutex_destroy
#else /* DEBUG_THREADS */
/* From now on, Asterisk REQUIRES Recursive (not error checking) mutexes
and will not run without them. */
#ifdef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
#define AST_MUTEX_INIT_VAULE PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
#else
#define AST_MUTEX_INIT_VAULE PTHREAD_MUTEX_INITIALIZER
#endif
#ifdef PTHREAD_MUTEX_RECURSIVE_NP
#define AST_MUTEX_KIND PTHREAD_MUTEX_RECURSIVE_NP
#else
#define AST_MUTEX_KIND PTHREAD_MUTEX_RECURSIVE
#endif
typedef pthread_mutex_t ast_mutex_t;
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)
#define ast_mutex_unlock(pmutex) pthread_mutex_unlock(pmutex)
#define ast_mutex_destroy(pmutex) pthread_mutex_destroy(pmutex)
#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS)
/* if AST_MUTEX_INIT_W_CONSTRUCTORS is defined, use file scope
constrictors/destructors to create/destroy mutexes. */
#define __AST_MUTEX_DEFINE(scope,mutex) \
scope ast_mutex_t mutex = AST_MUTEX_INIT_VAULE; \
static void __attribute__ ((constructor)) init_##mutex(void) \
{ \
ast_mutex_init(&mutex); \
} \
static void __attribute__ ((destructor)) fini_##mutex(void) \
{ \
ast_mutex_destroy(&mutex); \
}
#define ast_mutex_lock(pmutex) pthread_mutex_lock(pmutex)
#define ast_mutex_trylock(pmutex) pthread_mutex_trylock(pmutex)
#elif defined(AST_MUTEX_INIT_ON_FIRST_USE)
/* if AST_MUTEX_INIT_ON_FIRST_USE is defined, mutexes are created on
first use. The performance impact on FreeBSD should be small since
the pthreads library does this itself to initialize errror checking
(defaulty type) mutexes.*/
#define __AST_MUTEX_DEFINE(scope,mutex) \
scope ast_mutex_t mutex = AST_MUTEX_INIT_VAULE
static inline int ast_mutex_lock(ast_mutex_t *pmutex)
{
if(*pmutex == (ast_mutex_t)AST_MUTEX_KIND)
ast_mutex_init(pmutex);
return pthread_mutex_lock(pmutex);
}
static inline int ast_mutex_trylock(ast_mutex_t *pmutex)
{
if(*pmutex == (ast_mutex_t)AST_MUTEX_KIND)
ast_mutex_init(pmutex);
return pthread_mutex_trylock(pmutex);
}
#else
/* By default, use static initialization of mutexes.*/
#define __AST_MUTEX_DEFINE(scope,mutex) \
scope ast_mutex_t mutex = AST_MUTEX_INIT_VAULE
#define ast_mutex_lock(pmutex) pthread_mutex_lock(pmutex)
#define ast_mutex_trylock(pmutex) pthread_mutex_trylock(pmutex)
#endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
#endif /* DEBUG_THREADS */
#define AST_MUTEX_DEFINE_STATIC(mutex) __AST_MUTEX_DEFINE(static,mutex)
#define AST_MUTEX_DEFINE_EXPORTED(mutex) __AST_MUTEX_DEFINE(/**/,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__
#endif
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