// | |
// detail/posix_signal_blocker.hpp | |
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
// | |
// Copyright (c) 2003-2011 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
// | |
// Distributed under the Boost Software License, Version 1.0. (See accompanying | |
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
// | |
#ifndef BOOST_ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP | |
#define BOOST_ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP | |
#if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
# pragma once | |
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
#include <boost/asio/detail/config.hpp> | |
#if defined(BOOST_HAS_PTHREADS) && !defined(BOOST_ASIO_DISABLE_THREADS) | |
#include <csignal> | |
#include <pthread.h> | |
#include <signal.h> | |
#include <boost/asio/detail/noncopyable.hpp> | |
#include <boost/asio/detail/push_options.hpp> | |
namespace boost { | |
namespace asio { | |
namespace detail { | |
class posix_signal_blocker | |
: private noncopyable | |
{ | |
public: | |
// Constructor blocks all signals for the calling thread. | |
posix_signal_blocker() | |
: blocked_(false) | |
{ | |
sigset_t new_mask; | |
sigfillset(&new_mask); | |
blocked_ = (pthread_sigmask(SIG_BLOCK, &new_mask, &old_mask_) == 0); | |
} | |
// Destructor restores the previous signal mask. | |
~posix_signal_blocker() | |
{ | |
if (blocked_) | |
pthread_sigmask(SIG_SETMASK, &old_mask_, 0); | |
} | |
// Block all signals for the calling thread. | |
void block() | |
{ | |
if (!blocked_) | |
{ | |
sigset_t new_mask; | |
sigfillset(&new_mask); | |
blocked_ = (pthread_sigmask(SIG_BLOCK, &new_mask, &old_mask_) == 0); | |
} | |
} | |
// Restore the previous signal mask. | |
void unblock() | |
{ | |
if (blocked_) | |
blocked_ = (pthread_sigmask(SIG_SETMASK, &old_mask_, 0) != 0); | |
} | |
private: | |
// Have signals been blocked. | |
bool blocked_; | |
// The previous signal mask. | |
sigset_t old_mask_; | |
}; | |
} // namespace detail | |
} // namespace asio | |
} // namespace boost | |
#include <boost/asio/detail/pop_options.hpp> | |
#endif // defined(BOOST_HAS_PTHREADS) && !defined(BOOST_ASIO_DISABLE_THREADS) | |
#endif // BOOST_ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP |