diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/sem_post.c')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/sem_post.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/sem_post.c b/nptl/sysdeps/unix/sysv/linux/sem_post.c index 2da6ecd696..b4ee4cfc8a 100644 --- a/nptl/sysdeps/unix/sysv/linux/sem_post.c +++ b/nptl/sysdeps/unix/sysv/linux/sem_post.c @@ -1,7 +1,7 @@ /* sem_post -- post to a POSIX semaphore. Generic futex-using version. Copyright (C) 2003 Free Software Foundation, Inc. This file is part of the GNU C Library. - Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. + Contributed by Jakub Jelinek <jakub@redhat.com>, 2003. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public @@ -32,13 +32,14 @@ __new_sem_post (sem_t *sem) int *futex = (int *) sem; int err, nr; - __asm __volatile (__lll_rel_instr ::: "memory"); nr = atomic_exchange_and_add (futex, 1); - err = lll_futex_wake (futex, nr); - if (err == 0) - return 0; - __set_errno (-err); - return -1; + err = lll_futex_wake (futex, nr + 1); + if (__builtin_expect (err, 0) < 0) + { + __set_errno (-err); + return -1; + } + return 0; } versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1); #if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1) |