diff options
| author | Ulrich Drepper <drepper@redhat.com> | 2008-01-10 18:34:43 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2008-01-10 18:34:43 +0000 |
| commit | ab355d9aa5186937757b20b93f7d52ea3926427a (patch) | |
| tree | 202797696b5ede624ce3e0bfeb14e39dc4d5dc5f /nptl/sysdeps/unix/sysv/linux/sem_post.c | |
| parent | f6bacb8ef4dfcee39864d6383e3660d8ac267d23 (diff) | |
| download | glibc-ab355d9aa5186937757b20b93f7d52ea3926427a.tar.gz glibc-ab355d9aa5186937757b20b93f7d52ea3926427a.tar.xz glibc-ab355d9aa5186937757b20b93f7d52ea3926427a.zip | |
* 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.
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, 13 insertions, 2 deletions
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 <jakub@redhat.com>, 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) { |