module Binary:sig
..end
type
t
The type of binary semaphores.
val make : bool -> t
make b
returns a new binary semaphore.
If b
is true
, the initial value of the semaphore is 1, meaning
"available". If b
is false
, the initial value of the
semaphore is 0, meaning "unavailable".
val release : t -> unit
release s
sets the value of semaphore s
to 1, putting it in the
"available" state. If other threads are waiting on s
, one of them is
restarted.
val acquire : t -> unit
acquire s
blocks the calling thread until the semaphore s
has value 1 (is available), then atomically sets it to 0
and returns.
val try_acquire : t -> bool
try_acquire s
immediately returns false
if the semaphore s
has value 0. If s
has value 1, its value is atomically set to 0
and try_acquire s
returns true
.