diff options
Diffstat (limited to 'lib/libc_r/uthread/uthread_suspend_np.c')
| -rw-r--r-- | lib/libc_r/uthread/uthread_suspend_np.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/lib/libc_r/uthread/uthread_suspend_np.c b/lib/libc_r/uthread/uthread_suspend_np.c index 632dbf5169b..daeb60a661a 100644 --- a/lib/libc_r/uthread/uthread_suspend_np.c +++ b/lib/libc_r/uthread/uthread_suspend_np.c @@ -29,7 +29,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $OpenBSD: uthread_suspend_np.c,v 1.2 1999/01/06 05:29:29 d Exp $ + * $OpenBSD: uthread_suspend_np.c,v 1.3 1999/05/26 00:18:26 d Exp $ */ #include <errno.h> #ifdef _THREAD_SAFE @@ -52,8 +52,21 @@ pthread_suspend_np(pthread_t thread) thread->interrupted = 1; } + /* + * Guard against preemption by a scheduling signal. + * A change of thread state modifies the waiting + * and priority queues. + */ + _thread_kern_sched_defer(); + /* Suspend the thread. */ PTHREAD_NEW_STATE(thread,PS_SUSPENDED); + + /* + * Reenable preemption and yield if a scheduling signal + * occurred while in the critical region. + */ + _thread_kern_sched_undefer(); } return(ret); } |