diff options
Diffstat (limited to 'nptl/pthread_mutex_lock.c')
| -rw-r--r-- | nptl/pthread_mutex_lock.c | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/nptl/pthread_mutex_lock.c b/nptl/pthread_mutex_lock.c index 1519c142bd..29cc143e6c 100644 --- a/nptl/pthread_mutex_lock.c +++ b/nptl/pthread_mutex_lock.c @@ -62,6 +62,8 @@ static int __pthread_mutex_lock_full (pthread_mutex_t *mutex) int __pthread_mutex_lock (pthread_mutex_t *mutex) { + /* See concurrency notes regarding mutex type which is loaded from __kind + in struct __pthread_mutex_s in sysdeps/nptl/bits/thread-shared-types.h. */ unsigned int type = PTHREAD_MUTEX_TYPE_ELISION (mutex); LIBC_PROBE (mutex_entry, 1, mutex); @@ -350,8 +352,14 @@ __pthread_mutex_lock_full (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) { @@ -502,7 +510,10 @@ __pthread_mutex_lock_full (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; @@ -607,15 +618,18 @@ hidden_def (__pthread_mutex_lock) void __pthread_mutex_cond_lock_adjust (pthread_mutex_t *mutex) { - assert ((mutex->__data.__kind & PTHREAD_MUTEX_PRIO_INHERIT_NP) != 0); - assert ((mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0); - assert ((mutex->__data.__kind & PTHREAD_MUTEX_PSHARED_BIT) == 0); + /* 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)); + assert ((mutex_kind & PTHREAD_MUTEX_PRIO_INHERIT_NP) != 0); + assert ((mutex_kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0); + assert ((mutex_kind & PTHREAD_MUTEX_PSHARED_BIT) == 0); /* Record the ownership. */ pid_t id = THREAD_GETMEM (THREAD_SELF, tid); mutex->__data.__owner = id; - if (mutex->__data.__kind == PTHREAD_MUTEX_PI_RECURSIVE_NP) + if (mutex_kind == PTHREAD_MUTEX_PI_RECURSIVE_NP) ++mutex->__data.__count; } #endif |