182 lines
6.6 KiB
Plaintext
182 lines
6.6 KiB
Plaintext
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTERPROCESS_SHM_NAMED_MUTEX_HPP
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#define BOOST_INTERPROCESS_SHM_NAMED_MUTEX_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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#include <boost/interprocess/creation_tags.hpp>
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#include <boost/interprocess/exceptions.hpp>
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#include <boost/interprocess/detail/interprocess_tester.hpp>
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#include <boost/interprocess/permissions.hpp>
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#include <boost/interprocess/detail/posix_time_types_wrk.hpp>
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#include <boost/interprocess/shared_memory_object.hpp>
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#include <boost/interprocess/sync/interprocess_mutex.hpp>
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#include <boost/interprocess/detail/managed_open_or_create_impl.hpp>
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#include <boost/interprocess/sync/shm/named_creation_functor.hpp>
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//!\file
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//!Describes a named mutex class for inter-process synchronization
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namespace boost {
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namespace interprocess {
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namespace ipcdetail {
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class named_condition;
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//!A mutex with a global name, so it can be found from different
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//!processes. This mutex can't be placed in shared memory, and
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//!each process should have it's own named mutex.
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class shm_named_mutex
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{
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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//Non-copyable
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shm_named_mutex();
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shm_named_mutex(const shm_named_mutex &);
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shm_named_mutex &operator=(const shm_named_mutex &);
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friend class named_condition;
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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public:
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//!Creates a global interprocess_mutex with a name.
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//!Throws interprocess_exception on error.
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shm_named_mutex(create_only_t create_only, const char *name, const permissions &perm = permissions());
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//!Opens or creates a global mutex with a name.
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//!If the mutex is created, this call is equivalent to
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//!shm_named_mutex(create_only_t, ... )
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//!If the mutex is already created, this call is equivalent
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//!shm_named_mutex(open_only_t, ... )
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//!Does not throw
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shm_named_mutex(open_or_create_t open_or_create, const char *name, const permissions &perm = permissions());
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//!Opens a global mutex with a name if that mutex is previously
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//!created. If it is not previously created this function throws
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//!interprocess_exception.
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shm_named_mutex(open_only_t open_only, const char *name);
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//!Destroys *this and indicates that the calling process is finished using
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//!the resource. The destructor function will deallocate
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//!any system resources allocated by the system for use by this process for
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//!this resource. The resource can still be opened again calling
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//!the open constructor overload. To erase the resource from the system
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//!use remove().
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~shm_named_mutex();
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//!Unlocks a previously locked
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//!interprocess_mutex.
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void unlock();
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//!Locks interprocess_mutex, sleeps when interprocess_mutex is already locked.
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//!Throws interprocess_exception if a severe error is found
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void lock();
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//!Tries to lock the interprocess_mutex, returns false when interprocess_mutex
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//!is already locked, returns true when success.
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//!Throws interprocess_exception if a severe error is found
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bool try_lock();
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//!Tries to lock the interprocess_mutex until time abs_time,
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//!Returns false when timeout expires, returns true when locks.
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//!Throws interprocess_exception if a severe error is found
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bool timed_lock(const boost::posix_time::ptime &abs_time);
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//!Erases a named mutex from the system.
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//!Returns false on error. Never throws.
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static bool remove(const char *name);
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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typedef interprocess_mutex internal_mutex_type;
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interprocess_mutex &internal_mutex()
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{ return *static_cast<interprocess_mutex*>(m_shmem.get_user_address()); }
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private:
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friend class ipcdetail::interprocess_tester;
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void dont_close_on_destruction();
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typedef ipcdetail::managed_open_or_create_impl<shared_memory_object, 0, true, false> open_create_impl_t;
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open_create_impl_t m_shmem;
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typedef ipcdetail::named_creation_functor<interprocess_mutex> construct_func_t;
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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};
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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inline void shm_named_mutex::dont_close_on_destruction()
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{ ipcdetail::interprocess_tester::dont_close_on_destruction(m_shmem); }
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inline shm_named_mutex::~shm_named_mutex()
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{}
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inline shm_named_mutex::shm_named_mutex(create_only_t, const char *name, const permissions &perm)
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: m_shmem (create_only
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,name
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,sizeof(interprocess_mutex) +
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open_create_impl_t::ManagedOpenOrCreateUserOffset
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,read_write
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,0
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,construct_func_t(ipcdetail::DoCreate)
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,perm)
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{}
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inline shm_named_mutex::shm_named_mutex(open_or_create_t, const char *name, const permissions &perm)
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: m_shmem (open_or_create
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,name
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,sizeof(interprocess_mutex) +
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open_create_impl_t::ManagedOpenOrCreateUserOffset
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,read_write
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,0
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,construct_func_t(ipcdetail::DoOpenOrCreate)
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,perm)
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{}
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inline shm_named_mutex::shm_named_mutex(open_only_t, const char *name)
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: m_shmem (open_only
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,name
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,read_write
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,0
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,construct_func_t(ipcdetail::DoOpen))
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{}
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inline void shm_named_mutex::lock()
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{ this->internal_mutex().lock(); }
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inline void shm_named_mutex::unlock()
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{ this->internal_mutex().unlock(); }
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inline bool shm_named_mutex::try_lock()
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{ return this->internal_mutex().try_lock(); }
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inline bool shm_named_mutex::timed_lock(const boost::posix_time::ptime &abs_time)
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{ return this->internal_mutex().timed_lock(abs_time); }
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inline bool shm_named_mutex::remove(const char *name)
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{ return shared_memory_object::remove(name); }
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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} //namespace ipcdetail {
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} //namespace interprocess {
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} //namespace boost {
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#include <boost/interprocess/detail/config_end.hpp>
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#endif //BOOST_INTERPROCESS_SHM_NAMED_MUTEX_HPP
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