86 lines
1.8 KiB
C++
86 lines
1.8 KiB
C++
|
//
|
||
|
|
// detail/posix_signal_blocker.hpp
|
||
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
//
|
||
|
|
// Copyright (c) 2003-2021 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 ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
|
||
|
|
#define ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
|
||
|
|
|
||
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
|
||
|
|
# pragma once
|
||
|
|
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
|
||
|
|
|
||
|
|
#include "asio/detail/config.hpp"
|
||
|
|
|
||
|
|
#if defined(ASIO_HAS_PTHREADS)
|
||
|
|
|
||
|
|
#include <csignal>
|
||
|
|
#include <pthread.h>
|
||
|
|
#include <signal.h>
|
||
|
|
#include "asio/detail/noncopyable.hpp"
|
||
|
|
|
||
|
|
#include "asio/detail/push_options.hpp"
|
||
|
|
|
||
|
|
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
|
||
|
|
|
||
|
|
#include "asio/detail/pop_options.hpp"
|
||
|
|
|
||
|
|
#endif // defined(ASIO_HAS_PTHREADS)
|
||
|
|
|
||
|
|
#endif // ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
|