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86 lines
1.8 KiB
86 lines
1.8 KiB
//
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// detail/posix_signal_blocker.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
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#define ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if defined(ASIO_HAS_PTHREADS)
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#include <csignal>
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#include <pthread.h>
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#include <signal.h>
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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class posix_signal_blocker
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: private noncopyable
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{
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public:
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// Constructor blocks all signals for the calling thread.
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posix_signal_blocker()
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: blocked_(false)
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{
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sigset_t new_mask;
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sigfillset(&new_mask);
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blocked_ = (pthread_sigmask(SIG_BLOCK, &new_mask, &old_mask_) == 0);
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}
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// Destructor restores the previous signal mask.
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~posix_signal_blocker()
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{
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if (blocked_)
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pthread_sigmask(SIG_SETMASK, &old_mask_, 0);
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}
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// Block all signals for the calling thread.
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void block()
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{
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if (!blocked_)
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{
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sigset_t new_mask;
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sigfillset(&new_mask);
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blocked_ = (pthread_sigmask(SIG_BLOCK, &new_mask, &old_mask_) == 0);
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}
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}
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// Restore the previous signal mask.
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void unblock()
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{
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if (blocked_)
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blocked_ = (pthread_sigmask(SIG_SETMASK, &old_mask_, 0) != 0);
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}
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private:
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// Have signals been blocked.
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bool blocked_;
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// The previous signal mask.
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sigset_t old_mask_;
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // defined(ASIO_HAS_PTHREADS)
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#endif // ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
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