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-rw-r--r--include/linux/wait.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/include/linux/wait.h b/include/linux/wait.h
index 0a410a449258..1f4fb0a81ecd 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -346,6 +346,47 @@ do { \
346 __ret; \ 346 __ret; \
347}) 347})
348 348
349#define __wait_event_killable(wq, condition, ret) \
350do { \
351 DEFINE_WAIT(__wait); \
352 \
353 for (;;) { \
354 prepare_to_wait(&wq, &__wait, TASK_KILLABLE); \
355 if (condition) \
356 break; \
357 if (!fatal_signal_pending(current)) { \
358 schedule(); \
359 continue; \
360 } \
361 ret = -ERESTARTSYS; \
362 break; \
363 } \
364 finish_wait(&wq, &__wait); \
365} while (0)
366
367/**
368 * wait_event_killable - sleep until a condition gets true
369 * @wq: the waitqueue to wait on
370 * @condition: a C expression for the event to wait for
371 *
372 * The process is put to sleep (TASK_KILLABLE) until the
373 * @condition evaluates to true or a signal is received.
374 * The @condition is checked each time the waitqueue @wq is woken up.
375 *
376 * wake_up() has to be called after changing any variable that could
377 * change the result of the wait condition.
378 *
379 * The function will return -ERESTARTSYS if it was interrupted by a
380 * signal and 0 if @condition evaluated to true.
381 */
382#define wait_event_killable(wq, condition) \
383({ \
384 int __ret = 0; \
385 if (!(condition)) \
386 __wait_event_killable(wq, condition, __ret); \
387 __ret; \
388})
389
349/* 390/*
350 * Must be called with the spinlock in the wait_queue_head_t held. 391 * Must be called with the spinlock in the wait_queue_head_t held.
351 */ 392 */