voron

commit 8e791c295ff1004c6ddd6f0535418fe0f8363199
parent 44c6403f317da166dfc0621e7e6a42bb16a2178d
Author: oblique <psyberbits@gmail.com>
Date:   Tue, 13 Nov 2012 07:08:41 +0200

fix a race-condition in semaphore_wait()

Diffstat:
M
include/semaphore.h
 | 
3
+++

1 file changed, 3 insertions(+), 0 deletions(-)
diff --git a/include/semaphore.h b/include/semaphore.h
@@ -1,6 +1,7 @@
 #ifndef __SEMAPHORE_H
 #define __SEMAPHORE_H
 
+#include <irq.h>
 #include <io.h>
 #include <spinlock.h>
 #include <sched.h>
@@ -45,8 +46,10 @@ semaphore_wait(semaphore_t *sem)
 	while (1) {
 		spinlock_lock(&sem->lock);
 		if (sem->counter == 0) {
+			sched_disable();
 			suspend_task_no_schedule((u32)sem);
 			spinlock_unlock(&sem->lock);
+			sched_enable();
 			schedule();
 			continue;
 		}