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Diffstat (limited to '3rdParty/Boost/src/boost/asio/detail/eventfd_select_interrupter.hpp')
-rw-r--r--3rdParty/Boost/src/boost/asio/detail/eventfd_select_interrupter.hpp157
1 files changed, 157 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/asio/detail/eventfd_select_interrupter.hpp b/3rdParty/Boost/src/boost/asio/detail/eventfd_select_interrupter.hpp
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+++ b/3rdParty/Boost/src/boost/asio/detail/eventfd_select_interrupter.hpp
@@ -0,0 +1,157 @@
+//
+// eventfd_select_interrupter.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2008 Roelof Naude (roelof.naude at gmail 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_EVENTFD_SELECT_INTERRUPTER_HPP
+#define BOOST_ASIO_DETAIL_EVENTFD_SELECT_INTERRUPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/system/system_error.hpp>
+#include <boost/asio/detail/pop_options.hpp>
+
+#if defined(linux)
+# if !defined(BOOST_ASIO_DISABLE_EVENTFD)
+# include <linux/version.h>
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
+# define BOOST_ASIO_HAS_EVENTFD
+# endif // LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
+# endif // !defined(BOOST_ASIO_DISABLE_EVENTFD)
+#endif // defined(linux)
+
+#if defined(BOOST_ASIO_HAS_EVENTFD)
+
+#include <boost/asio/detail/push_options.hpp>
+#include <fcntl.h>
+#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+# include <asm/unistd.h>
+#else // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+# include <sys/eventfd.h>
+#endif // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/error.hpp>
+#include <boost/asio/detail/socket_types.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class eventfd_select_interrupter
+{
+public:
+ // Constructor.
+ eventfd_select_interrupter()
+ {
+#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+ write_descriptor_ = read_descriptor_ = syscall(__NR_eventfd, 0);
+#else // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+ write_descriptor_ = read_descriptor_ = ::eventfd(0, 0);
+#endif // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
+ if (read_descriptor_ != -1)
+ {
+ ::fcntl(read_descriptor_, F_SETFL, O_NONBLOCK);
+ }
+ else
+ {
+ int pipe_fds[2];
+ if (pipe(pipe_fds) == 0)
+ {
+ read_descriptor_ = pipe_fds[0];
+ ::fcntl(read_descriptor_, F_SETFL, O_NONBLOCK);
+ write_descriptor_ = pipe_fds[1];
+ ::fcntl(write_descriptor_, F_SETFL, O_NONBLOCK);
+ }
+ else
+ {
+ boost::system::error_code ec(errno,
+ boost::asio::error::get_system_category());
+ boost::system::system_error e(ec, "eventfd_select_interrupter");
+ boost::throw_exception(e);
+ }
+ }
+ }
+
+ // Destructor.
+ ~eventfd_select_interrupter()
+ {
+ if (write_descriptor_ != -1 && write_descriptor_ != read_descriptor_)
+ ::close(write_descriptor_);
+ if (read_descriptor_ != -1)
+ ::close(read_descriptor_);
+ }
+
+ // Interrupt the select call.
+ void interrupt()
+ {
+ uint64_t counter(1UL);
+ int result = ::write(write_descriptor_, &counter, sizeof(uint64_t));
+ (void)result;
+ }
+
+ // Reset the select interrupt. Returns true if the call was interrupted.
+ bool reset()
+ {
+ if (write_descriptor_ == read_descriptor_)
+ {
+ // Only perform one read. The kernel maintains an atomic counter.
+ uint64_t counter(0);
+ int bytes_read = ::read(read_descriptor_, &counter, sizeof(uint64_t));
+ bool was_interrupted = (bytes_read > 0);
+ return was_interrupted;
+ }
+ else
+ {
+ // Clear all data from the pipe.
+ char data[1024];
+ int bytes_read = ::read(read_descriptor_, data, sizeof(data));
+ bool was_interrupted = (bytes_read > 0);
+ while (bytes_read == sizeof(data))
+ bytes_read = ::read(read_descriptor_, data, sizeof(data));
+ return was_interrupted;
+ }
+ }
+
+ // Get the read descriptor to be passed to select.
+ int read_descriptor() const
+ {
+ return read_descriptor_;
+ }
+
+private:
+ // The read end of a connection used to interrupt the select call. This file
+ // descriptor is passed to select such that when it is time to stop, a single
+ // 64bit value will be written on the other end of the connection and this
+ // descriptor will become readable.
+ int read_descriptor_;
+
+ // The write end of a connection used to interrupt the select call. A single
+ // 64bit non-zero value may be written to this to wake up the select which is
+ // waiting for the other end to become readable. This descriptor will only
+ // differ from the read descriptor when a pipe is used.
+ int write_descriptor_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#endif // defined(BOOST_ASIO_HAS_EVENTFD)
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_EVENTFD_SELECT_INTERRUPTER_HPP