diff options
Diffstat (limited to 'nptl/pthread_rwlock_tryrdlock.c')
| -rw-r--r-- | nptl/pthread_rwlock_tryrdlock.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/nptl/pthread_rwlock_tryrdlock.c b/nptl/pthread_rwlock_tryrdlock.c index d51d9aa930..cde123fd5d 100644 --- a/nptl/pthread_rwlock_tryrdlock.c +++ b/nptl/pthread_rwlock_tryrdlock.c @@ -20,12 +20,14 @@ #include "pthreadP.h" #include <lowlevellock.h> #include <elide.h> +#include <stdbool.h> int __pthread_rwlock_tryrdlock (pthread_rwlock_t *rwlock) { int result = EBUSY; + bool wake = false; if (ELIDE_TRYLOCK (rwlock->__data.__rwelision, rwlock->__data.__lock == 0 @@ -45,11 +47,25 @@ __pthread_rwlock_tryrdlock (pthread_rwlock_t *rwlock) result = EAGAIN; } else - result = 0; + { + result = 0; + /* See pthread_rwlock_rdlock. */ + if (rwlock->__data.__nr_readers == 1 + && rwlock->__data.__nr_readers_queued > 0 + && rwlock->__data.__nr_writers_queued > 0) + { + ++rwlock->__data.__readers_wakeup; + wake = true; + } + } } lll_unlock (rwlock->__data.__lock, rwlock->__data.__shared); + if (wake) + lll_futex_wake (&rwlock->__data.__readers_wakeup, INT_MAX, + rwlock->__data.__shared); + return result; } strong_alias (__pthread_rwlock_tryrdlock, pthread_rwlock_tryrdlock) |