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New EVTHREAD_TRY_LOCK function to try to grab a lock.

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This commit is contained in:
Nick Mathewson 2009-11-28 11:31:39 -05:00
parent 2b7abf038f
commit 689fc091a5
1 changed files with 19 additions and 0 deletions
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19
evthread-internal.h
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@ -30,6 +30,7 @@
extern "C" { extern "C" {
#endif #endif
#include <event2/thread.h>
#include "event-config.h" #include "event-config.h"
#include "util-internal.h" #include "util-internal.h"
@ -142,6 +143,22 @@ extern int _evthread_lock_debugging_enabled;
int _evthread_is_debug_lock_held(void *lock); int _evthread_is_debug_lock_held(void *lock);
/** Try to grab the lock for 'lockvar' without blocking, and return 1 if we
* manage to get it. */
static inline int EVLOCK_TRY_LOCK(void *lock);
static inline int
EVLOCK_TRY_LOCK(void *lock)
{
if (lock && _evthread_lock_fns.lock) {
int r = _evthread_lock_fns.lock(EVTHREAD_TRY, lock);
return !r;
} else {
/* Locking is disabled either globally or for this thing;
* of course we count as having the lock. */
return 1;
}
}
#else /* _EVENT_DISABLE_THREAD_SUPPORT */ #else /* _EVENT_DISABLE_THREAD_SUPPORT */
#define EVTHREAD_GET_ID() 1 #define EVTHREAD_GET_ID() 1
@ -157,6 +174,8 @@ int _evthread_is_debug_lock_held(void *lock);
#define EVBASE_ACQUIRE_LOCK(base, lock) _EVUTIL_NIL_STMT #define EVBASE_ACQUIRE_LOCK(base, lock) _EVUTIL_NIL_STMT
#define EVBASE_RELEASE_LOCK(base, lock) _EVUTIL_NIL_STMT #define EVBASE_RELEASE_LOCK(base, lock) _EVUTIL_NIL_STMT
#define EVLOCK_ASSERT_LOCKED(lock) _EVUTIL_NIL_STMT #define EVLOCK_ASSERT_LOCKED(lock) _EVUTIL_NIL_STMT
#define EVTHREAD_TRY_LOCK(lock) 1
#endif #endif
#ifdef __cplusplus #ifdef __cplusplus