benchthread.c

benchthread.c.txt

#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>

int nthreads;
sem_t die;

void * thread_func(void *arg) {
	if ((int)arg == nthreads-1) {
		sem_post(&die);
	}
	else {
		while (1) {
			sleep(0); // имитация бурной деятельности
		}
	}
}

int main(int argc, char *argv[]) {
	nthreads = atoi(argv[1]);
	pthread_t *threads = calloc(nthreads, sizeof(pthread_t));
	int i;
	sem_init(&die, 0, 0);
	for (i = 0; i < nthreads; i++) {
		pthread_create(threads + i, NULL, thread_func, (void *)i);
	}
	sem_wait(&die);
	printf("Time to die\n");
}