diff options
Diffstat (limited to 'nptl/pthread_mutex_trylock.c')
| -rw-r--r-- | nptl/pthread_mutex_trylock.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/nptl/pthread_mutex_trylock.c b/nptl/pthread_mutex_trylock.c index 7de61f4f68..fa90c1d1e6 100644 --- a/nptl/pthread_mutex_trylock.c +++ b/nptl/pthread_mutex_trylock.c @@ -36,6 +36,8 @@ __pthread_mutex_trylock (pthread_mutex_t *mutex) int oldval; pid_t id = THREAD_GETMEM (THREAD_SELF, tid); + /* See concurrency notes regarding mutex type which is loaded from __kind + in struct __pthread_mutex_s in sysdeps/nptl/bits/thread-shared-types.h. */ switch (__builtin_expect (PTHREAD_MUTEX_TYPE_ELISION (mutex), PTHREAD_MUTEX_TIMED_NP)) { @@ -199,8 +201,14 @@ __pthread_mutex_trylock (pthread_mutex_t *mutex) case PTHREAD_MUTEX_PI_ROBUST_NORMAL_NP: case PTHREAD_MUTEX_PI_ROBUST_ADAPTIVE_NP: { - int kind = mutex->__data.__kind & PTHREAD_MUTEX_KIND_MASK_NP; - int robust = mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP; + int kind, robust; + { + /* See concurrency notes regarding __kind in struct __pthread_mutex_s + in sysdeps/nptl/bits/thread-shared-types.h. */ + int mutex_kind = atomic_load_relaxed (&(mutex->__data.__kind)); + kind = mutex_kind & PTHREAD_MUTEX_KIND_MASK_NP; + robust = mutex_kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP; + } if (robust) /* Note: robust PI futexes are signaled by setting bit 0. */ @@ -325,7 +333,10 @@ __pthread_mutex_trylock (pthread_mutex_t *mutex) case PTHREAD_MUTEX_PP_NORMAL_NP: case PTHREAD_MUTEX_PP_ADAPTIVE_NP: { - int kind = mutex->__data.__kind & PTHREAD_MUTEX_KIND_MASK_NP; + /* See concurrency notes regarding __kind in struct __pthread_mutex_s + in sysdeps/nptl/bits/thread-shared-types.h. */ + int kind = atomic_load_relaxed (&(mutex->__data.__kind)) + & PTHREAD_MUTEX_KIND_MASK_NP; oldval = mutex->__data.__lock; |