A small change to the code for the mutex using semaphores:
void f() {
// Locking code
sem_wait(&sem1);
mutex_owner = getpid();
// CS
// Unlocking code
if(getpid() == mutex_owner) {
sem_post(&sem1);
} else {
abort(); // Invalid program operation: mutex not owned is being
unlocked.
}
}
--
DK
http://twitter.com/divyekapoor
http://www.divye.in
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