Commit ee8e3c3f authored by Ian Lynagh's avatar Ian Lynagh
Browse files

Reinstate: Always check the result of pthread_mutex_lock() and pthread_mutex_unlock().

Sun Jan  4 19:24:43 GMT 2009  Matthias Kilian <>
    Don't check pthread_mutex_*lock() only on Linux and/or only if DEBUG
    is defined. The return values of those functions are well defined
    and should be supported on all operation systems with pthreads. The
    checks are cheap enough to do them even in the default build (without
    While here, recycle an unused macro ASSERT_LOCK_NOTHELD, and let
    the debugBelch part enabled with -DLOCK_DEBUG work independently
    of -DDEBUG.
parent b2391c27
......@@ -23,6 +23,7 @@
#include <pthread.h>
#include <errno.h>
typedef pthread_cond_t Condition;
typedef pthread_mutex_t Mutex;
......@@ -34,48 +35,27 @@ typedef pthread_key_t ThreadLocalKey;
#define LOCK_DEBUG_BELCH(what, mutex) \
debugBelch("%s(0x%p) %s %d\n", what, mutex, __FILE__, __LINE__)
#define LOCK_DEBUG_BELCH(what, mutex) /* nothing */
/* Always check the result of lock and unlock. */
#define ACQUIRE_LOCK(mutex) \
debugBelch("ACQUIRE_LOCK(0x%p) %s %d\n", mutex,__FILE__,__LINE__); \
#define RELEASE_LOCK(mutex) \
debugBelch("RELEASE_LOCK(0x%p) %s %d\n", mutex,__FILE__,__LINE__); \
#define ASSERT_LOCK_HELD(mutex) /* nothing */
#elif defined(DEBUG) && defined(linux_HOST_OS)
#include <errno.h>
* On Linux, we can use extensions to determine whether we already
* hold a lock or not, which is useful for debugging.
#define ACQUIRE_LOCK(mutex) \
if (pthread_mutex_lock(mutex) == EDEADLK) { \
barf("multiple ACQUIRE_LOCK: %s %d", __FILE__,__LINE__); \
#define RELEASE_LOCK(mutex) \
if (pthread_mutex_unlock(mutex) != 0) { \
barf("RELEASE_LOCK: I do not own this lock: %s %d", __FILE__,__LINE__); \
#define ASSERT_LOCK_HELD(mutex) ASSERT(pthread_mutex_lock(mutex) == EDEADLK)
#define ASSERT_LOCK_NOTHELD(mutex) \
if (pthread_mutex_lock(mutex) != EDEADLK) { \
pthread_mutex_unlock(mutex); \
} else { \
ASSERT(0); \
#define ACQUIRE_LOCK(mutex) pthread_mutex_lock(mutex)
#define RELEASE_LOCK(mutex) pthread_mutex_unlock(mutex)
#define ASSERT_LOCK_HELD(mutex) /* nothing */
# elif defined(HAVE_WINDOWS_H)
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