source: benchmark/schedint/pthreads.c@ 6f9cc13

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

#include "bench.h"

int argc;
char** argv;
volatile int go = 0;

pthread_cond_t c;
pthread_mutex_t m;

void __attribute__((noinline)) call() {
        pthread_mutex_lock(&m);
        pthread_cond_signal(&c);
        pthread_mutex_unlock(&m);
}

int  __attribute__((noinline)) wait() {
        pthread_mutex_lock(&m);
        go = 1;
        BENCH(
                for (size_t i = 0; i < n; i++) {
                        pthread_cond_wait(&c, &m);
                },
                result
        )

        printf("%g\n", result);
        go = 0;
        pthread_mutex_unlock(&m);
        return 0;
}

void* thread_main(__attribute__((unused)) void * arg ) {
        while(go == 0) { sched_yield(); }
        while(go == 1) { call(); }
        return NULL;
}

int main(__attribute__((unused)) int argc, __attribute__((unused)) char* argv[]) {
        pthread_t thread;
        if (pthread_create(&thread, NULL, thread_main, NULL) < 0) {
                perror( "failure" );
                return 1;
        }
        wait();
        if (pthread_join( thread, NULL) < 0) {
                perror( "failure" );
                return 1;
        }
        return 0;
}