From ab355d9aa5186937757b20b93f7d52ea3926427a Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Thu, 10 Jan 2008 18:34:43 +0000 Subject: * pthread-errnos.sym: Add EOVERFLOW. * sysdeps/unix/sysv/linux/structsem.sym: Add SEM_VALUE_MAX. * sysdeps/unix/sysv/linux/sem_post.c: Don't overflow value field. * sysdeps/unix/sysv/linux/i386/i486/sem_post.S: Likewise. * sysdeps/unix/sysv/linux/x86_64/sem_post.S: Likewise. --- nptl/sysdeps/unix/sysv/linux/sem_post.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) (limited to 'nptl/sysdeps/unix/sysv/linux/sem_post.c') diff --git a/nptl/sysdeps/unix/sysv/linux/sem_post.c b/nptl/sysdeps/unix/sysv/linux/sem_post.c index 25b676fcd2..58b226f63d 100644 --- a/nptl/sysdeps/unix/sysv/linux/sem_post.c +++ b/nptl/sysdeps/unix/sysv/linux/sem_post.c @@ -1,5 +1,5 @@ /* sem_post -- post to a POSIX semaphore. Generic futex-using version. - Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc. + Copyright (C) 2003, 2004, 2007, 2008 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Jakub Jelinek , 2003. @@ -31,7 +31,18 @@ __new_sem_post (sem_t *sem) { struct new_sem *isem = (struct new_sem *) sem; - int nr = atomic_increment_val (&isem->value); + __typeof (isem->value) cur; + do + { + cur = isem->value; + if (isem->value == SEM_VALUE_MAX) + { + __set_errno (EOVERFLOW); + return -1; + } + } + while (atomic_compare_and_exchange_bool_acq (&isem->value, cur + 1, cur)); + atomic_full_barrier (); if (isem->nwaiters > 0) { -- cgit v1.2.3