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comparison libgomp/config/linux/mutex.h @ 55:77e2b8dfacca gcc-4.4.5

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update it from 4.4.3 to 4.5.0
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 23:39:51 +0900
parents a06113de4d67
children 04ced10e8804
comparison
equal deleted inserted replaced
52:c156f1bd5cd9 55:77e2b8dfacca
46 } 46 }
47 47
48 extern void gomp_mutex_unlock_slow (gomp_mutex_t *mutex); 48 extern void gomp_mutex_unlock_slow (gomp_mutex_t *mutex);
49 static inline void gomp_mutex_unlock (gomp_mutex_t *mutex) 49 static inline void gomp_mutex_unlock (gomp_mutex_t *mutex)
50 { 50 {
51 /* Warning: By definition __sync_lock_test_and_set() does not have
52 proper memory barrier semantics for a mutex unlock operation.
53 However, this default implementation is written assuming that it
54 does, which is true for some targets.
55
56 Targets that require additional memory barriers before
57 __sync_lock_test_and_set to achieve the release semantics of
58 mutex unlock, are encouraged to include
59 "config/linux/ia64/mutex.h" in a target specific mutex.h instead
60 of using this file. */
51 int val = __sync_lock_test_and_set (mutex, 0); 61 int val = __sync_lock_test_and_set (mutex, 0);
52 if (__builtin_expect (val > 1, 0)) 62 if (__builtin_expect (val > 1, 0))
53 gomp_mutex_unlock_slow (mutex); 63 gomp_mutex_unlock_slow (mutex);
54 } 64 }
55 65