pthread_cond_wait的问题

ddbddb1

我看的是glibc2.4中的源码

int
__pthread_cond_wait (cond, mutex)
     pthread_cond_t *cond;
     pthread_mutex_t *mutex;
{
…………………
  do
    {
      unsigned int futex_val = cond->__data.__futex;

      /* Prepare to wait.  Release the condvar futex.  */
      lll_mutex_unlock (cond->__data.__lock);

      /* Enable asynchronous cancellation.  Required by the standard.  */
      cbuffer.oldtype = __pthread_enable_asynccancel ();

      /* Wait until woken by signal or broadcast.  */
      lll_futex_wait (&cond->__data.__futex, futex_val);

      /* Disable asynchronous cancellation.  */
      __pthread_disable_asynccancel (cbuffer.oldtype);

      /* We are going to look at shared data again, so get the lock.  */
      lll_mutex_lock (cond->__data.__lock);
…………………
}

在lll_mutex_unlock()后， lll_futex_wait()前，pthread_cond_signal()是能发送“信号”的吧，这样不会导致“信号”的丢失？

djsxut

从pthread_cond_wait来看，应该是不会丢失的。