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closures: closure_wait_event()

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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 <kent.overstreet@gmail.com>
Acked-by: Coly Li <colyli@suse.de>
This commit is contained in:
Kent Overstreet 2017-12-09 12:42:44 -05:00 committed by Kent Overstreet
parent bd0d22e41e
commit ced58fc7ab
1 changed files with 22 additions and 0 deletions
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22
include/linux/closure.h
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@ -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 */