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+//
+// detail/posix_static_mutex.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_STATIC_MUTEX_HPP
+#define ASIO_DETAIL_POSIX_STATIC_MUTEX_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 <pthread.h>
+#include "asio/detail/scoped_lock.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+struct posix_static_mutex
+{
+ typedef asio::detail::scoped_lock<posix_static_mutex> scoped_lock;
+
+ // Initialise the mutex.
+ void init()
+ {
+ // Nothing to do.
+ }
+
+ // Lock the mutex.
+ void lock()
+ {
+ (void)::pthread_mutex_lock(&mutex_); // Ignore EINVAL.
+ }
+
+ // Unlock the mutex.
+ void unlock()
+ {
+ (void)::pthread_mutex_unlock(&mutex_); // Ignore EINVAL.
+ }
+
+ ::pthread_mutex_t mutex_;
+};
+
+#define ASIO_POSIX_STATIC_MUTEX_INIT { PTHREAD_MUTEX_INITIALIZER }
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_HAS_PTHREADS)
+
+#endif // ASIO_DETAIL_POSIX_STATIC_MUTEX_HPP