linux开发---15.【C】线程条件变量

1.
read_thread从终端输入一个个的字符,当遇到q字符时,发送cond_signal
write_thread一直在等侍signal,当收到read_thread发来的signal之后打印退出
2. 源码

cong@msi:/work/test/thread/4cond$ cat cond.c
#include "utils.h"
pthread_mutex_t thread_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t thread_cond = PTHREAD_COND_INITIALIZER;
int c;
void* read_thread(void* arg)
{
    while((c=getchar()) != 'q');
    printf("read=%c\n", c);
    printf("send signal\n");
    pthread_cond_signal(&thread_cond);
    return NULL;
}

void* write_thread(void* arg)
{
    pthread_mutex_lock(&thread_mutex);
    printf("wait cond\n");
    pthread_cond_wait(&thread_cond, &thread_mutex);
    printf("write=%c\n", c);
    pthread_mutex_unlock(&thread_mutex);
}

int main ( int argc, char *argv[] )
{
    pthread_t thread_id1;
    pthread_t thread_id2;
    void* thread_result;
    int status;

    status = pthread_create(&thread_id1, NULL, read_thread, NULL);
    status = pthread_create(&thread_id2, NULL, write_thread, NULL);

    status = pthread_join(thread_id1, &thread_result);
    status = pthread_join(thread_id2, &thread_result);

    return EXIT_SUCCESS;
}

运行结果

cong@msi:/work/test/thread/4cond$ ./cond
wait cond
a
b
c
d
e
f
q
read=q
send signal
write=q

4cond.rar (下载后改名为4cond.tar.gz)