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Backport support for read/write locks.

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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@49022 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Joshua Colp
2006-12-28 19:43:15 +00:00
parent 4d6a91eef0
commit 345968e6fb
4 changed files with 199 additions and 1 deletions
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6
include/asterisk/autoconfig.h.in
View File

@@ -250,6 +250,12 @@
/* Define to indicate the ${PRI_DESCRIP} library */
#undef HAVE_PRI
/* Define to 1 if your system has PTHREAD_RWLOCK_INITIALIZER. */
#undef HAVE_PTHREAD_RWLOCK_INITIALIZER
/* Define to 1 if your system has PTHREAD_RWLOCK_PREFER_WRITER_NP. */
#undef HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP
/* Define to 1 if the system has the type `ptrdiff_t'. */
#undef HAVE_PTRDIFF_T

66
include/asterisk/lock.h
View File

@@ -614,6 +614,72 @@ static void __attribute__ ((destructor)) fini_##mutex(void) \
#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