X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;ds=sidebyside;f=include%2Flinux%2Fwait.h;h=21cd4df67b241845cbc71bd6c8997d52b4938c8d;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=e0f2b2ffc16f04be1e3d209b3ea0291dcfae4efc;hpb=a2c21200f1c81b08cb55e417b68150bba439b646;p=linux-2.6.git

diff --git a/include/linux/wait.h b/include/linux/wait.h
index e0f2b2ffc..21cd4df67 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -3,11 +3,20 @@
 
 #define WNOHANG		0x00000001
 #define WUNTRACED	0x00000002
+#define WSTOPPED	WUNTRACED
+#define WEXITED		0x00000004
+#define WCONTINUED	0x00000008
+#define WNOWAIT		0x01000000	/* Don't reap, just poll status.  */
 
 #define __WNOTHREAD	0x20000000	/* Don't wait on children of other threads in this group */
 #define __WALL		0x40000000	/* Wait on all children, regardless of type */
 #define __WCLONE	0x80000000	/* Wait only on non-SIGCHLD children */
 
+/* First argument to waitid: */
+#define P_ALL		0
+#define P_PID		1
+#define P_PGID		2
+
 #ifdef __KERNEL__
 
 #include <linux/config.h>
@@ -80,6 +89,15 @@ static inline int waitqueue_active(wait_queue_head_t *q)
 	return !list_empty(&q->task_list);
 }
 
+/*
+ * Used to distinguish between sync and async io wait context:
+ * sync i/o typically specifies a NULL wait queue entry or a wait
+ * queue entry bound to a task (current task) to wake up.
+ * aio specifies a wait queue entry with an async notification
+ * callback routine, not associated with any task.
+ */
+#define is_sync_wait(wait)	(!(wait) || ((wait)->task))
+
 extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
 extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait));
 extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
@@ -138,6 +156,29 @@ do {									\
 	__wait_event(wq, condition);					\
 } while (0)
 
+#define __wait_event_timeout(wq, condition, ret)			\
+do {									\
+	DEFINE_WAIT(__wait);						\
+									\
+	for (;;) {							\
+		prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE);	\
+		if (condition)						\
+			break;						\
+		ret = schedule_timeout(ret);				\
+		if (!ret)						\
+			break;						\
+	}								\
+	finish_wait(&wq, &__wait);					\
+} while (0)
+
+#define wait_event_timeout(wq, condition, timeout)			\
+({									\
+	long __ret = timeout;						\
+	if (!(condition)) 						\
+		__wait_event_timeout(wq, condition, __ret);		\
+	__ret;								\
+})
+
 #define __wait_event_interruptible(wq, condition, ret)			\
 do {									\
 	DEFINE_WAIT(__wait);						\