Messages in this thread Patch in this message | | | Date | Mon, 22 Aug 2022 13:18:21 +0200 | From | Peter Zijlstra <> | Subject | [PATCH v3 5/6] sched/wait: Add wait_event_state() |
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Allows waiting with a custom @state.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- include/linux/wait.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)
--- a/include/linux/wait.h +++ b/include/linux/wait.h @@ -931,6 +931,34 @@ extern int do_wait_intr_irq(wait_queue_h __ret; \ }) +#define __wait_event_state(wq, condition, state) \ + ___wait_event(wq, condition, state, 0, 0, schedule()) + +/** + * wait_event_state - sleep until a condition gets true + * @wq_head: the waitqueue to wait on + * @condition: a C expression for the event to wait for + * @state: state to sleep in + * + * The process is put to sleep (@state) until the @condition evaluates to true + * or a signal is received. The @condition is checked each time the waitqueue + * @wq_head 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_state(wq_head, condition, state) \ +({ \ + int __ret = 0; \ + might_sleep(); \ + if (!(condition)) \ + __ret = __wait_event_state(wq_head, condition, state); \ + __ret; \ +}) + #define __wait_event_killable_timeout(wq_head, condition, timeout) \ ___wait_event(wq_head, ___wait_cond_timeout(condition), \ TASK_KILLABLE, 0, timeout, \
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