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// Copyright (c) 2001 David Muse
// See the file COPYING for more information
#include <sys/types.h>
#include <sys/ipc.h>
#include <rudiments/semaphoreset.h>
#include <rudiments/permissions.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, const char **argv) {
// attach to the semaphore set keyed to /tmp/sem containing 2 semaphores
semaphoreset sem;
sem.attach(ftok("/tmp/sem",0),2);
// loop 10 times, printing 1 and 2, synchronizing with another process
// using the semaphores
for (int i=0; i<10; i++) {
sem.wait(1);
printf("1\n");
sem.signal(0);
sem.wait(1);
printf("3\n");
sem.signal(0);
}
unlink("/tmp/sem");
}
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