// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

// bthread - An M:N threading library to make applications more concurrent.

// Date: Tue Jul 10 17:40:58 CST 2012

#include <signal.h>

#include "bthread/interrupt_pthread.h"

namespace bthread {

// TODO: Make sure SIGURG is not used by user.

// This empty handler is simply for triggering EINTR in blocking syscalls.

void do_nothing_handler(int) {}

static pthread_once_t register_sigurg_once = PTHREAD_ONCE_INIT;

static void register_sigurg() {

    signal(SIGURG, do_nothing_handler);

}

int interrupt_pthread(pthread_t th) {

    pthread_once(&register_sigurg_once, register_sigurg);

    return pthread_kill(th, SIGURG);

}

}  // namespace bthread