C++ (Cpp) notification_recv示例

示例#1

文件： lwt_unix_stubs.c 项目： domsj/lwt

value lwt_unix_recv_notifications()
{
  int ret, i, current_index;
  value result;
#if !defined(LWT_ON_WINDOWS)
  sigset_t new_mask;
  sigset_t old_mask;
  int error;
  sigfillset(&new_mask);
  pthread_sigmask(SIG_SETMASK, &new_mask, &old_mask);
#else
  DWORD error;
#endif
  lwt_unix_mutex_lock(&notification_mutex);
  /* Receive the signal. */
  ret = notification_recv();
#if defined(LWT_ON_WINDOWS)
  if (ret == SOCKET_ERROR) {
    error = WSAGetLastError();
    lwt_unix_mutex_unlock(&notification_mutex);
    win32_maperr(error);
    uerror("recv_notifications", Nothing);
  }
#else
  if (ret < 0) {
    error = errno;
    lwt_unix_mutex_unlock(&notification_mutex);
    pthread_sigmask(SIG_SETMASK, &old_mask, NULL);
    unix_error(error, "recv_notifications", Nothing);
  }
#endif

  do {
    /*
     release the mutex while calling caml_alloc,
     which may call gc and switch the thread,
     resulting in a classical deadlock,
     when thread in question tries another send
    */
    current_index = notification_index;
    lwt_unix_mutex_unlock(&notification_mutex);
    result = caml_alloc_tuple(current_index);
    lwt_unix_mutex_lock(&notification_mutex);
    /* check that no new notifications appeared meanwhile (rare) */
  }
  while (current_index != notification_index);

  /* Read all pending notifications. */
  for (i = 0; i < notification_index; i++)
    Field(result, i) = Val_long(notifications[i]);
  /* Reset the index. */
  notification_index = 0;
  lwt_unix_mutex_unlock(&notification_mutex);
#if !defined(LWT_ON_WINDOWS)
  pthread_sigmask(SIG_SETMASK, &old_mask, NULL);
#endif
  return result;
}

示例#2

文件： lwt_unix_stubs.c 项目： acieroid/lwt

value lwt_unix_recv_notifications()
{
  int ret, i;
  value result;
#if !defined(LWT_ON_WINDOWS)
  sigset_t new_mask;
  sigset_t old_mask;
  int error;
  sigfillset(&new_mask);
  pthread_sigmask(SIG_SETMASK, &new_mask, &old_mask);
#else
  DWORD error;
#endif
  lwt_unix_mutex_lock(&notification_mutex);
  /* Receive the signal. */
  ret = notification_recv();
#if defined(LWT_ON_WINDOWS)
  if (ret == SOCKET_ERROR) {
    error = WSAGetLastError();
    lwt_unix_mutex_unlock(&notification_mutex);
    win32_maperr(error);
    uerror("recv_notifications", Nothing);
  }
#else
  if (ret < 0) {
    error = errno;
    lwt_unix_mutex_unlock(&notification_mutex);
    pthread_sigmask(SIG_SETMASK, &old_mask, NULL);
    unix_error(error, "recv_notifications", Nothing);
  }
#endif
  /* Read all pending notifications. */
  result = caml_alloc_tuple(notification_index);
  for (i = 0; i < notification_index; i++)
    Field(result, i) = Val_long(notifications[i]);
  /* Reset the index. */
  notification_index = 0;
  lwt_unix_mutex_unlock(&notification_mutex);
#if !defined(LWT_ON_WINDOWS)
  pthread_sigmask(SIG_SETMASK, &old_mask, NULL);
#endif
  return result;
}