c - PThread Mutex无法按预期工作

Question

我正在使用互斥锁尝试将对代码的某些部分的访问限制为一个线程，但是似乎没有锁定一次并阻止其他线程，而是允许所有线程“锁定”。以下是我的代码，然后是输出的一部分，显示该代码无法正常工作。

//headers defined, etc

pthread_mutex_t queuemutex = PTHREAD_MUTEX_INITIALIZER;

// other code with various functions

int main(void) {

    //unrelated code

    threadinformation **threadArray = (threadinformation **)malloc( POOLSIZE * sizeof(threadinformation) );

    int k;
    for (k = 0; k < POOLSIZE; k++) {
        pthread_t thread;
        threadinformation *currentThread = (threadinformation *)malloc(sizeof(threadinformation));
        currentThread->state = (int *)malloc(sizeof(int));
        currentThread->state[0] = 0;
        currentThread->currentWaiting = currentWaiting;
        currentThread->number = k;
        threadArray[k] = currentThread;
        pthread_create(&thread, NULL, readWriteToClient, threadArray[k]); //thread is created here
        currentThread->thread = thread;
        joinArray[k] = thread;
    }

    //unrelated code

}

static void* readWriteToClient(void *inputcontent) {

    while(1){

        //unrelated code

        pthread_mutex_lock(&queuemutex); //problem happens here

        fprintf(stderr,"Thread %d got locked \n",threadInput->number);

        while((threadInput->currentWaiting->status) == 0){
            pthread_cond_wait(&cond, &queuemutex);
            fprintf(stderr,"Thread %d got signalled \n",threadInput->number);
        }

        connfd = threadInput->currentWaiting->fd;
        threadInput->currentWaiting->status = 0;
        pthread_cond_signal(&conncond);
        pthread_mutex_unlock(&queuemutex);

        //unrelated code

    }

}

输出。

Thread 0 got locked 
Thread 7 got locked 
Thread 25 got locked 
Thread 97 got locked 
Thread 6 got locked 
Thread 5 got locked 
Thread 4 got locked 
Thread 3 got locked 
Thread 8 got locked 
Thread 9 got locked 
Thread 10 got locked 
Thread 11 got locked 
Thread 12 got locked 
Thread 13 got locked 
Thread 14 got locked 
Thread 15 got locked 
Thread 16 got locked 
Thread 17 got locked 
Thread 18 got locked 
Thread 19 got locked 
Thread 20 got locked 
    And so on...

Answer 1

没有问题。

pthread_cond_wait(＆cond，＆queuemutex);

等待条件变量释放互斥量。