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author | Matthew Wilcox <matthew@wil.cx> | 2007-12-06 12:00:00 -0500 |
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committer | Matthew Wilcox <willy@linux.intel.com> | 2007-12-06 17:40:14 -0500 |
commit | 1411d5a7fbe7dce1568b6f0a94c7cbc69eed1bfe (patch) | |
tree | c69fa1370eeb40d43c26444db61a853162683771 /include/linux/wait.h | |
parent | 294d5cc233d81ec4aec77ebc60dc5752a3d0082a (diff) | |
download | linux-stable-1411d5a7fbe7dce1568b6f0a94c7cbc69eed1bfe.tar.gz linux-stable-1411d5a7fbe7dce1568b6f0a94c7cbc69eed1bfe.tar.bz2 linux-stable-1411d5a7fbe7dce1568b6f0a94c7cbc69eed1bfe.zip |
Add wait_event_killable
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Diffstat (limited to 'include/linux/wait.h')
-rw-r--r-- | include/linux/wait.h | 41 |
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 { \ __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. */ |