From 83d87915da34fc02d170ff8c356406040da2823f Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Tue, 15 May 2007 06:24:31 +0000 Subject: * sysdeps/unix/sysv/linux/sem_post.c: Only wake threads if old value of semaphore was zero. * sysdeps/unix/sysv/linux/i386/i486/sem_post.S: Likewise. * sysdeps/unix/sysv/linux/powerpc/sem_post.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/sem_post.c: Likewise. * sysdeps/unix/sysv/linux/x86_64/sem_post.S: Likewise. * sysdeps/unix/sysv/linux/x86_64/sem_wait.S: Remove unnecessary extra cancellation test. * sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S: Likewise. --- nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) (limited to 'nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c') diff --git a/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c b/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c index 91b9955181..86dd0ebb3b 100644 --- a/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c +++ b/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 , 2003. @@ -32,12 +32,14 @@ __new_sem_post (sem_t *sem) int *futex = (int *) 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) + if (atomic_increment_val (futex) == 1) { - __set_errno (-err); - return -1; + int err = lll_futex_wake (futex, 1); + if (__builtin_expect (err, 0) < 0) + { + __set_errno (-err); + return -1; + } } return 0; } -- cgit 1.4.1