mutex.c

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

static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;

extern void __wait() {
	printf("__wait pthread_mutex_lock # => %d\n", pthread_mutex_lock(&mutex));
	printf("__wait pthread_cond_wait # => %d\n", pthread_cond_wait(&cond, &mutex));
	printf("__wait pthread_mutex_unlock # => %d\n", pthread_mutex_unlock(&mutex));
}

extern void __signal() {
	printf("__signal pthread_mutex_lock # => %d\n", pthread_mutex_lock(&mutex));
	printf("__signal pthread_cond_broadcast # => %d\n", pthread_cond_broadcast(&cond));
	printf("__signal pthread_mutex_unlock # => %d\n", pthread_mutex_unlock(&mutex));
}

mutex.go

package main

import (
	"log"
	"time"
)

func __wait () __asm__("__wait")
func __signal () __asm__("__signal")

func main() {
	quit := make(chan int)

	go func() {
		runtime.LockOSThread()
		log.Printf("before wait")
		__wait()
		log.Printf("after wait")
		quit <- 1
	}()

	time.Sleep(time.Second)
	log.Printf("before signal")
	__signal()
	log.Printf("after signal")

	<-quit
}