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Completions are basically a oneshot flag, which provide a `wait()` call that blocks until 'finish()' has been called on the completion. The nice aspect of completions is that because it is a oneshot the order does not matter - if 'finish()' is called before 'wait()' then 'wait()' returns immediately. It makes the logic for waiting until a thread is done finishing up some work easy to implement.
27 lines
685 B
C
27 lines
685 B
C
#ifndef INCLUDE_LIBQB_COMPLETION_H
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#define INCLUDE_LIBQB_COMPLETION_H
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#include "mutex.h"
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#include "condvar.h"
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// A completion is a oneshot signal - it waits until finish is called and
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// then never blocks again.
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//
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// Due to the oneshot nature the order wait() and finish() are called does not matter.
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struct completion {
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int finished;
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struct libqb_mutex *mutex;
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struct libqb_condvar *var;
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};
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void completion_init(struct completion *);
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void completion_clear(struct completion *);
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// Blocks until the completion is finished
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void completion_wait(struct completion *);
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// Finishes the completion, unblocks all waiters
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void completion_finish(struct completion *);
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#endif
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