Add wait_event_killable
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
diff --git a/include/linux/wait.h b/include/linux/wait.h
index 0a410a4..1f4fb0a 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -346,6 +346,47 @@
__ret; \
})
+#define __wait_event_killable(wq, condition, ret) \
+do { \
+ DEFINE_WAIT(__wait); \
+ \
+ for (;;) { \
+ prepare_to_wait(&wq, &__wait, TASK_KILLABLE); \
+ if (condition) \
+ break; \
+ if (!fatal_signal_pending(current)) { \
+ schedule(); \
+ continue; \
+ } \
+ ret = -ERESTARTSYS; \
+ break; \
+ } \
+ finish_wait(&wq, &__wait); \
+} while (0)
+
+/**
+ * wait_event_killable - sleep until a condition gets true
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ *
+ * The process is put to sleep (TASK_KILLABLE) until the
+ * @condition evaluates to true or a signal is received.
+ * The @condition is checked each time the waitqueue @wq is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ * The function will return -ERESTARTSYS if it was interrupted by a
+ * signal and 0 if @condition evaluated to true.
+ */
+#define wait_event_killable(wq, condition) \
+({ \
+ int __ret = 0; \
+ if (!(condition)) \
+ __wait_event_killable(wq, condition, __ret); \
+ __ret; \
+})
+
/*
* Must be called with the spinlock in the wait_queue_head_t held.
*/