Commit 9f35f671 authored by Simon Marlow's avatar Simon Marlow
Browse files

add comment for ASSERT_LOCK_HELD()

parent ff124db4
......@@ -54,6 +54,11 @@ typedef pthread_key_t ThreadLocalKey;
barf("RELEASE_LOCK: I do not own this lock: %s %d", __FILE__,__LINE__); \
// Note: this assertion calls pthread_mutex_lock() on a mutex that
// is already held by the calling thread. The mutex should therefore
// have been created with PTHREAD_MUTEX_ERRORCHECK, otherwise this
// assertion will hang. We always initialise mutexes with
// PTHREAD_MUTEX_ERRORCHECK when DEBUG is on (see rts/posix/OSThreads.h).
#define ASSERT_LOCK_HELD(mutex) ASSERT(pthread_mutex_lock(mutex) == EDEADLK)
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