[PATCH 14/20] closures: closure_wait_event()
From: Kent Overstreet <kent.overstreet@linux.dev>
Date: 2023-07-12 21:12:41
Also in:
linux-fsdevel, lkml
Subsystem:
closures, the rest · Maintainers:
Kent Overstreet, Linus Torvalds
From: Kent Overstreet <redacted> Like wait_event() - except, because it uses closures and closure waitlists it doesn't have the restriction on modifying task state inside the condition check, like wait_event() does. Signed-off-by: Kent Overstreet <redacted> Acked-by: Coly Li <redacted> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev> --- include/linux/closure.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/include/linux/closure.h b/include/linux/closure.h
index 0ec9e7bc8d..36b4a83f9b 100644
--- a/include/linux/closure.h
+++ b/include/linux/closure.h@@ -374,4 +374,26 @@ static inline void closure_call(struct closure *cl, closure_fn fn, continue_at_nobarrier(cl, fn, wq); } +#define __closure_wait_event(waitlist, _cond) \ +do { \ + struct closure cl; \ + \ + closure_init_stack(&cl); \ + \ + while (1) { \ + closure_wait(waitlist, &cl); \ + if (_cond) \ + break; \ + closure_sync(&cl); \ + } \ + closure_wake_up(waitlist); \ + closure_sync(&cl); \ +} while (0) + +#define closure_wait_event(waitlist, _cond) \ +do { \ + if (!(_cond)) \ + __closure_wait_event(waitlist, _cond); \ +} while (0) + #endif /* _LINUX_CLOSURE_H */
--
2.40.1