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LOCK(2) LOCK(2)
NAME
lock - thread locking.
SYNOPSIS
include "lock.m";
lock := load Lock Lock->PATH;
Semaphore: adt {
c: chan of int;
obtain: fn(s: self ref Semaphore);
release: fn(s: self ref Semaphore);
new: fn(): ref Semaphore;
};
init: fn();
DESCRIPTION
Lock provides semaphore-based mutual exclusion. Init must be called
before creating any locks.
Semaphore.new()
Creates and returns a reference to a new Semaphore (lock).
s.obtain()
Obtains exclusive access to the lock s. It will block until it
can do so.
s.release()
Releases access to the lock s and allows processes waiting on it
to proceed.
SOURCE
/appl/lib/lock.b
LOCK(2)
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