diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c b/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c index 06b3bd0ab..0082c570a 100644 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c @@ -1,5 +1,5 @@ /* sem_post -- post to a POSIX semaphore. Powerpc version. - Copyright (C) 2003, 2004 Free Software Foundation, Inc. + Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. @@ -27,15 +27,20 @@ int __new_sem_post (sem_t *sem) { - int *futex = (int *) sem; + struct new_sem *isem = (struct new_sem *) sem; __asm __volatile (__lll_rel_instr ::: "memory"); - int nr = atomic_increment_val (futex); - int err = lll_futex_wake (futex, nr); - if (__builtin_expect (err, 0) < 0) + atomic_increment (&isem->value); + __asm __volatile (__lll_acq_instr ::: "memory"); + if (isem->nwaiters > 0) { - __set_errno (-err); - return -1; + int err = lll_futex_wake (&isem->value, 1, + isem->private ^ FUTEX_PRIVATE_FLAG); + if (__builtin_expect (err, 0) < 0) + { + __set_errno (-err); + return -1; + } } return 0; } |