Imported Upstream version 1.49.0upstream/1.49.0

1 files changed, 170 insertions, 0 deletions

diff --git a/boost/interprocess/sync/interprocess_mutex.hpp b/boost/interprocess/sync/interprocess_mutex.hpp
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+++ b/boost/interprocess/sync/interprocess_mutex.hpp
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+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2005-2011. 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)
+//
+// See http://www.boost.org/libs/interprocess for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Parts of the pthread code come from Boost Threads code.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_INTERPROCESS_MUTEX_HPP
+#define BOOST_INTERPROCESS_MUTEX_HPP
+
+/// @cond
+
+#if (defined _MSC_VER) && (_MSC_VER >= 1200)
+#  pragma once
+#endif
+
+#include <boost/interprocess/detail/config_begin.hpp>
+#include <boost/interprocess/exceptions.hpp>
+#include <boost/interprocess/detail/workaround.hpp>
+#include <boost/interprocess/detail/posix_time_types_wrk.hpp>
+#include <boost/assert.hpp>
+
+#if !defined(BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION) && defined (BOOST_INTERPROCESS_POSIX_PROCESS_SHARED)
+   #include <boost/interprocess/sync/posix/mutex.hpp>
+   #define BOOST_INTERPROCESS_USE_POSIX
+//Experimental...
+//#elif !defined(BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION) && defined (BOOST_INTERPROCESS_WINDOWS)
+//   #include <boost/interprocess/sync/windows/mutex.hpp>
+//   #define BOOST_INTERPROCESS_USE_WINDOWS
+#elif !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
+   #include <boost/interprocess/sync/spin/mutex.hpp>
+   #define BOOST_INTERPROCESS_USE_GENERIC_EMULATION
+
+namespace boost {
+namespace interprocess {
+namespace ipcdetail{
+namespace robust_emulation_helpers {
+
+template<class T>
+class mutex_traits;
+
+}}}}
+
+#endif
+
+/// @endcond
+
+//!\file
+//!Describes a mutex class that can be placed in memory shared by
+//!several processes.
+
+namespace boost {
+namespace interprocess {
+
+class interprocess_condition;
+
+//!Wraps a interprocess_mutex that can be placed in shared memory and can be 
+//!shared between processes. Allows timed lock tries
+class interprocess_mutex
+{
+   /// @cond
+   //Non-copyable
+   interprocess_mutex(const interprocess_mutex &);
+   interprocess_mutex &operator=(const interprocess_mutex &);
+   friend class interprocess_condition;
+   /// @endcond
+   public:
+
+   //!Constructor.
+   //!Throws interprocess_exception on error.
+   interprocess_mutex();
+
+   //!Destructor. If any process uses the mutex after the destructor is called
+   //!the result is undefined. Does not throw.
+   ~interprocess_mutex();
+
+   //!Effects: The calling thread tries to obtain ownership of the mutex, and
+   //!   if another thread has ownership of the mutex, it waits until it can
+   //!   obtain the ownership. If a thread takes ownership of the mutex the
+   //!   mutex must be unlocked by the same mutex.
+   //!Throws: interprocess_exception on error.
+   void lock();
+
+   //!Effects: The calling thread tries to obtain ownership of the mutex, and
+   //!   if another thread has ownership of the mutex returns immediately.
+   //!Returns: If the thread acquires ownership of the mutex, returns true, if
+   //!   the another thread has ownership of the mutex, returns false.
+   //!Throws: interprocess_exception on error.
+   bool try_lock();
+
+   //!Effects: The calling thread will try to obtain exclusive ownership of the
+   //!   mutex if it can do so in until the specified time is reached. If the
+   //!   mutex supports recursive locking, the mutex must be unlocked the same
+   //!   number of times it is locked. 
+   //!Returns: If the thread acquires ownership of the mutex, returns true, if
+   //!   the timeout expires returns false. 
+   //!Throws: interprocess_exception on error.
+   bool timed_lock(const boost::posix_time::ptime &abs_time);
+
+   //!Effects: The calling thread releases the exclusive ownership of the mutex.
+   //!Throws: interprocess_exception on error.
+   void unlock();
+   /// @cond
+   private:
+
+   #if defined(BOOST_INTERPROCESS_USE_GENERIC_EMULATION)
+      #undef BOOST_INTERPROCESS_USE_GENERIC_EMULATION
+      friend class ipcdetail::robust_emulation_helpers::mutex_traits<interprocess_mutex>;
+      void take_ownership(){ mutex.take_ownership(); }
+      ipcdetail::spin_mutex mutex;
+   #elif defined(BOOST_INTERPROCESS_USE_POSIX)
+      #undef BOOST_INTERPROCESS_USE_POSIX
+      ipcdetail::posix_mutex mutex;
+   #elif defined(BOOST_INTERPROCESS_USE_WINDOWS)
+      #undef BOOST_INTERPROCESS_USE_WINDOWS
+      ipcdetail::windows_mutex mutex;
+   #else
+      #error "Unknown platform for interprocess_mutex"
+   #endif
+   /// @endcond
+};
+
+}  //namespace interprocess {
+}  //namespace boost {
+
+
+namespace boost {
+namespace interprocess {
+
+inline interprocess_mutex::interprocess_mutex(){}
+
+inline interprocess_mutex::~interprocess_mutex(){}
+
+inline void interprocess_mutex::lock()
+{
+   #ifdef BOOST_INTERPROCESS_ENABLE_TIMEOUT_WHEN_LOCKING
+      boost::posix_time::ptime wait_time
+         = boost::posix_time::microsec_clock::universal_time()
+         + boost::posix_time::milliseconds(BOOST_INTERPROCESS_TIMEOUT_WHEN_LOCKING_DURATION_MS);
+      if (!mutex.timed_lock(wait_time))
+      {
+         throw interprocess_exception(timeout_when_locking_error, "Interprocess mutex timeout when locking. Possible deadlock: owner died without unlocking?");
+      }
+   #else
+      mutex.lock();
+   #endif
+}
+
+inline bool interprocess_mutex::try_lock()
+{ return mutex.try_lock(); }
+
+inline bool interprocess_mutex::timed_lock(const boost::posix_time::ptime &abs_time)
+{ return mutex.timed_lock(abs_time); }
+
+inline void interprocess_mutex::unlock()
+{ mutex.unlock(); }
+
+}  //namespace interprocess {
+}  //namespace boost {
+
+#include <boost/interprocess/detail/config_end.hpp>
+
+#endif   //BOOST_INTERPROCESS_MUTEX_HPP