Chris@16: //
Chris@16: // detail/posix_signal_blocker.hpp
Chris@16: // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Chris@16: //
Chris@101: // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
Chris@16: #define BOOST_ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: # pragma once
Chris@16: #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: 
Chris@16: #include <boost/asio/detail/config.hpp>
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_HAS_PTHREADS)
Chris@16: 
Chris@16: #include <csignal>
Chris@16: #include <pthread.h>
Chris@16: #include <signal.h>
Chris@16: #include <boost/asio/detail/noncopyable.hpp>
Chris@16: 
Chris@16: #include <boost/asio/detail/push_options.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace asio {
Chris@16: namespace detail {
Chris@16: 
Chris@16: class posix_signal_blocker
Chris@16:   : private noncopyable
Chris@16: {
Chris@16: public:
Chris@16:   // Constructor blocks all signals for the calling thread.
Chris@16:   posix_signal_blocker()
Chris@16:     : blocked_(false)
Chris@16:   {
Chris@16:     sigset_t new_mask;
Chris@16:     sigfillset(&new_mask);
Chris@16:     blocked_ = (pthread_sigmask(SIG_BLOCK, &new_mask, &old_mask_) == 0);
Chris@16:   }
Chris@16: 
Chris@16:   // Destructor restores the previous signal mask.
Chris@16:   ~posix_signal_blocker()
Chris@16:   {
Chris@16:     if (blocked_)
Chris@16:       pthread_sigmask(SIG_SETMASK, &old_mask_, 0);
Chris@16:   }
Chris@16: 
Chris@16:   // Block all signals for the calling thread.
Chris@16:   void block()
Chris@16:   {
Chris@16:     if (!blocked_)
Chris@16:     {
Chris@16:       sigset_t new_mask;
Chris@16:       sigfillset(&new_mask);
Chris@16:       blocked_ = (pthread_sigmask(SIG_BLOCK, &new_mask, &old_mask_) == 0);
Chris@16:     }
Chris@16:   }
Chris@16: 
Chris@16:   // Restore the previous signal mask.
Chris@16:   void unblock()
Chris@16:   {
Chris@16:     if (blocked_)
Chris@16:       blocked_ = (pthread_sigmask(SIG_SETMASK, &old_mask_, 0) != 0);
Chris@16:   }
Chris@16: 
Chris@16: private:
Chris@16:   // Have signals been blocked.
Chris@16:   bool blocked_;
Chris@16: 
Chris@16:   // The previous signal mask.
Chris@16:   sigset_t old_mask_;
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: } // namespace asio
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/asio/detail/pop_options.hpp>
Chris@16: 
Chris@16: #endif // defined(BOOST_ASIO_HAS_PTHREADS)
Chris@16: 
Chris@16: #endif // BOOST_ASIO_DETAIL_POSIX_SIGNAL_BLOCKER_HPP