Windows命名信号量未被锁定

我正在开发C类，调用Windows API C库 .

我使用Semaphores执行任务，假设我有两个进程：

ProcessA有两个信号量：

Global \ processA_receiving_semaphore Global \ processA_waiting_semaphore

ProcessB有两个信号量：

Global \ processB_receiving_semaphore Global \ processB_waiting_semaphore

我在每个进程中都有两个线程：

在processA中发送线程：

等待“Global \ processB_waiting_semaphore”//做一些信号“Global \ processB_receiving_semaphore”

在processB上接收线程：

等待“Global \ processB_receiving_semaphore”//做一些信号“Global \ processB_waiting_semaphore”

我删除了发布"Global\processB_waiting_semaphore"的所有代码，但它仍然可以被获取 . 在该信号量上调用 WaitForSingleObject 总是会立即返回成功的等待 . 我尝试将超时时间设置为0，并且当NOTHING释放时它仍然获取信号量 .

接收信号量有 initial count = 0 和 max count = 1 ，而等待的信号量有 initial count = 1 和 max count = 1 .

在接收信号量上调用 WaitForSingleObject 可以很好地阻塞，直到被其他进程释放为止 . 问题在于等待信号量，我无法弄清楚原因 . 代码非常大，我确保信号量的名称设置正确 .

这是一个常见的问题吗？如果您需要更多解释，请发表评论，我将修改帖子 .

编辑：代码添加：

接收器信号量：

bool intr_process_comm::create_rcvr_semaphores()
{
  std::cout << "\n  Creating semaphore: " << "Global\\" << this_name << "_rcvr_sem";
  rcvr_sem = CreateSemaphore(NULL, 0, 1, ("Global\\" + this_name + "_rcvr_sem").c_str());

  std::cout << "\n  Creating semaphore: " << "Global\\" << this_name << "_wait_sem";
  wait_sem = CreateSemaphore(NULL, 1, 1, ("Global\\" + this_name + "_wait_sem").c_str());

  return (rcvr_sem && wait_sem);
}

发件人信号量：

// this sender connects to the wait semaphore in the target process
sndr_sem = OpenSemaphore(SEMAPHORE_MODIFY_STATE, FALSE, ("Global\\" + target_name + "_wait_sem").c_str());
// this target connects to the receiver semaphore in the target process
trgt_sem = OpenSemaphore(SEMAPHORE_MODIFY_STATE, FALSE, ("Global\\" + target_name + "_rcvr_sem").c_str());

DWORD intr_process_locking::wait(unsigned long period)
{
   return WaitForSingleObject(sndr_sem, period);
}

void intr_process_locking::signal()
{
   ReleaseSemaphore(trgt_sem, 1, 0);
}

接收线程功能：

void intr_process_comm::rcvr_thread_proc()
{
  while (conn_state == intr_process_comm::opened) {
    try {
      // wait on rcvr_semaphore for an infinite time
      WaitForSingleObject(rcvr_sem, INFINITE);
      if (inner_release) // if the semaphore was released within this process
        return;
      // once signaled by another process, get the message
      std::string msg_str((LPCSTR)hmf_mapview);
      // signal one of the waiters that want to put messages 
      // in this process's memory area
      // 
      // this doesn't change ANYTHING in execution, commented or not..
      //ReleaseSemaphore(wait_sem, 1, 0);

      // put this message in this process's queue
      Msg msg = Msg::from_xml(msg_str);
      if (msg.command == "connection")
        process_connection_message(msg);

      in_messages.enQ(msg);
      //std::cout << "\n  Message: \n"<< msg << "\n";
    }
    catch (std::exception e) {
      std::cout << "\n  Ran into trouble getting the message. Details: " << e.what();
    }
  }
}

发送线程功能：

void intr_process_comm::sndr_thread_proc()
{
  while (conn_state == intr_process_comm::opened ||
    (conn_state == intr_process_comm::closing && out_messages.size() > 0)
    ) {
    // pull a message out of the queue
    Msg msg = out_messages.deQ();

    if (connections.find(msg.destination) == connections.end())
      connections[msg.destination].connect(msg.destination);

    if (connections[msg.destination].connect(msg.destination)
      != intr_process_locking::state::opened) {
      blocked_messages[msg.destination].push_back(msg);
      continue;
    }

    // THIS ALWAYS GETS GETS WAIT_OBJECT_0 RESULT
    DWORD wait_result = connections[msg.destination].wait(wait_timeout);
    if (wait_result == WAIT_TIMEOUT) {  // <---- THIS IS NEVER TRUE
      out_messages.enQ(msg);
      continue;
    }
    // do things here
    // release the receiver semaphore in the other process
    connections[msg.destination].signal();
  }
}

澄清一些事情：

发件人中的 trgt_sem 是接收者中的 rcvr_sem .

发送方中的`sndr_sem'是接收方中的'wait_sem' .