WhyCan Forum(哇酷开发者社区)

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

// 共享数据及同步变量
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
static char play_filename[256] = {0};
static int play_request = 0;
extern int tinyplay(int argc, const char **argv);

void* audioplay_thread(void* arg)
{
	(void)arg;

	while (1)
	{
		pthread_mutex_lock(&mutex);

		while (!play_request) {
			printf("now waiting signal ...\n");
		    pthread_cond_wait(&cond, &mutex);
			printf("signal waited!\n");
		}

		printf("in audio play thread\n");
		play_request = 0; // 重置请求标志
		pthread_mutex_unlock(&mutex);



		printf("now playing: %s\n", play_filename);
		const char* argv[] = {"play", play_filename};
		int argc = sizeof(argv) / sizeof(argv[0]);

		tinyplay(argc, argv);
		//usleep(3*1000*1000);
	}
}

// 初始化并启动播放线程
void init_playback_thread() {
    pthread_t tid;
    pthread_create(&tid, NULL, audioplay_thread, NULL);
}

// 触发播放的函数
void request_play(const char* filename) {
    pthread_mutex_lock(&mutex);
    strncpy(play_filename, filename, sizeof(play_filename)-1);
    play_filename[sizeof(play_filename)-1] = '\0';
    play_request = 1;
    pthread_cond_signal(&cond);
    pthread_mutex_unlock(&mutex);
}

int main() {
    init_playback_thread();

    // 模拟其他线程触发播放
    request_play("test.wav");

    while(1)
    {

		char ch = getchar();
		if((ch == 'a') || (ch == 'A')) {
			request_play("/usr/lib/libreoffice/share/gallery/sounds/ok.wav");
		}
    }

    return 0;
}