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 //////////////////////////////////////////////////////////////////////////////
 //
 // (C) Copyright Ion Gaztanaga 2005-2012. 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.
 //
 //////////////////////////////////////////////////////////////////////////////
 
 #ifndef BOOST_INTERPROCESS_NAMED_SHARABLE_MUTEX_HPP
 #define BOOST_INTERPROCESS_NAMED_SHARABLE_MUTEX_HPP
 
 #ifndef BOOST_CONFIG_HPP
 #  include <boost/config.hpp>
 #endif
 #
 #if defined(BOOST_HAS_PRAGMA_ONCE)
 #  pragma once
 #endif
 
 #include <boost/interprocess/detail/config_begin.hpp>
 #include <boost/interprocess/detail/workaround.hpp>
 #include <boost/interprocess/creation_tags.hpp>
 #include <boost/interprocess/exceptions.hpp>
 #include <boost/interprocess/shared_memory_object.hpp>
 #include <boost/interprocess/detail/managed_open_or_create_impl.hpp>
 #include <boost/interprocess/sync/interprocess_sharable_mutex.hpp>
 #include <boost/interprocess/sync/shm/named_creation_functor.hpp>
 #include <boost/interprocess/permissions.hpp>
 
 //!\file
 //!Describes a named sharable mutex class for inter-process synchronization
 
 namespace boost {
 namespace interprocess {
 
 #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 namespace ipcdetail{ class interprocess_tester; }
 #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
 class named_condition;
 
 //!A sharable mutex with a global name, so it can be found from different
 //!processes. This mutex can't be placed in shared memory, and
 //!each process should have it's own named sharable mutex.
 class named_sharable_mutex
 {
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
    //Non-copyable
    named_sharable_mutex();
    named_sharable_mutex(const named_sharable_mutex &);
    named_sharable_mutex &operator=(const named_sharable_mutex &);
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
    public:
 
    //!Creates a global sharable mutex with a name.
    //!If the sharable mutex can't be created throws interprocess_exception
    named_sharable_mutex(create_only_t, const char *name, const permissions &perm = permissions());
 
    //!Opens or creates a global sharable mutex with a name.
    //!If the sharable mutex is created, this call is equivalent to
    //!named_sharable_mutex(create_only_t, ...)
    //!If the sharable mutex is already created, this call is equivalent to
    //!named_sharable_mutex(open_only_t, ... ).
    named_sharable_mutex(open_or_create_t, const char *name, const permissions &perm = permissions());
 
    //!Opens a global sharable mutex with a name if that sharable mutex
    //!is previously.
    //!created. If it is not previously created this function throws
    //!interprocess_exception.
    named_sharable_mutex(open_only_t, const char *name);
 
    #if defined(BOOST_INTERPROCESS_WCHAR_NAMED_RESOURCES) || defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 
    //!Creates a global sharable mutex with a name.
    //!If the sharable mutex can't be created throws interprocess_exception
    //! 
    //!Note: This function is only available on operating systems with
    //!      native wchar_t APIs (e.g. Windows).
    named_sharable_mutex(create_only_t, const wchar_t *name, const permissions &perm = permissions());
 
    //!Opens or creates a global sharable mutex with a name.
    //!If the sharable mutex is created, this call is equivalent to
    //!named_sharable_mutex(create_only_t, ...)
    //!If the sharable mutex is already created, this call is equivalent to
    //!named_sharable_mutex(open_only_t, ... ).
    //! 
    //!Note: This function is only available on operating systems with
    //!      native wchar_t APIs (e.g. Windows).
    named_sharable_mutex(open_or_create_t, const wchar_t *name, const permissions &perm = permissions());
 
    //!Opens a global sharable mutex with a name if that sharable mutex
    //!is previously.
    //!created. If it is not previously created this function throws
    //!interprocess_exception.
    //! 
    //!Note: This function is only available on operating systems with
    //!      native wchar_t APIs (e.g. Windows).
    named_sharable_mutex(open_only_t, const wchar_t *name);
 
    #endif   //defined(BOOST_INTERPROCESS_WCHAR_NAMED_RESOURCES) || defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 
    //!Destroys *this and indicates that the calling process is finished using
    //!the resource. The destructor function will deallocate
    //!any system resources allocated by the system for use by this process for
    //!this resource. The resource can still be opened again calling
    //!the open constructor overload. To erase the resource from the system
    //!use remove().
    ~named_sharable_mutex();
 
    //Exclusive locking
 
    //!Requires: The calling thread does not own the mutex.
    //!
    //!Effects: The calling thread tries to obtain exclusive ownership of the mutex,
    //!   and if another thread has exclusive or sharable ownership of
    //!   the mutex, it waits until it can obtain the ownership.
    //!Throws: interprocess_exception on error.
    //! 
    //!Note: A program may deadlock if the thread that has ownership calls 
    //!   this function. If the implementation can detect the deadlock,
    //!   an exception could be thrown.
    void lock();
 
    //!Requires: The calling thread does not own the mutex.
    //!
    //!Effects: The calling thread tries to acquire exclusive ownership of the mutex
    //!   without waiting. If no other thread has exclusive or sharable
    //!   ownership of the mutex this succeeds.
    //!Returns: If it can acquire exclusive ownership immediately returns true.
    //!   If it has to wait, returns false.
    //!Throws: interprocess_exception on error.
    //! 
    //!Note: A program may deadlock if the thread that has ownership calls 
    //!   this function. If the implementation can detect the deadlock,
    //!   an exception could be thrown.
    bool try_lock();
 
    //!Requires: The calling thread does not own the mutex.
    //!
    //!Effects: The calling thread tries to acquire exclusive ownership of the mutex
    //!   waiting if necessary until no other thread has exclusive, or sharable
    //!   ownership of the mutex or abs_time is reached.
    //!Returns: If acquires exclusive ownership, returns true. Otherwise returns false.
    //!Throws: interprocess_exception on error.
    //! 
    //!Note: A program may deadlock if the thread that has ownership calls 
    //!   this function. If the implementation can detect the deadlock,
    //!   an exception could be thrown.
    template<class TimePoint>
    bool timed_lock(const TimePoint &abs_time);
 
    //!Same as `timed_lock`, but this function is modeled after the
    //!standard library interface.
    template<class TimePoint> bool try_lock_until(const TimePoint &abs_time)
    {  return this->timed_lock(abs_time);  }
 
    //!Same as `timed_lock`, but this function is modeled after the
    //!standard library interface.
    template<class Duration>  bool try_lock_for(const Duration &dur)
    {  return this->timed_lock(ipcdetail::duration_to_ustime(dur)); }
 
    //!Precondition: The thread must have exclusive ownership of the mutex.
    //!Effects: The calling thread releases the exclusive ownership of the mutex.
    //!Throws: An exception derived from interprocess_exception on error.
    void unlock();
 
    //Sharable locking
 
    //!Requires: The calling thread does not own the mutex.
    //!
    //!Effects: The calling thread tries to obtain sharable ownership of the mutex,
    //!   and if another thread has exclusive ownership of the mutex,
    //!   waits until it can obtain the ownership.
    //!Throws: interprocess_exception on error.
    //!
    //!Note: A program may deadlock if the thread that has ownership calls 
    //!   this function. If the implementation can detect the deadlock,
    //!   an exception could be thrown
    void lock_sharable();
 
    //!Same as `lock_sharable` but with a std-compatible interface
    //! 
    void lock_shared()
    {  this->lock_sharable();  }
 
    //!Requires: The calling thread does not own the mutex.
    //!
    //!Effects: The calling thread tries to acquire sharable ownership of the mutex
    //!   without waiting. If no other thread has exclusive ownership
    //!   of the mutex this succeeds.
    //!Returns: If it can acquire sharable ownership immediately returns true. If it
    //!   has to wait, returns false.
    //!Throws: interprocess_exception on error.
    //!
    //!Note: A program may deadlock if the thread that has ownership calls 
    //!   this function. If the implementation can detect the deadlock,
    //!   an exception could be thrown
    bool try_lock_sharable();
 
    //!Same as `try_lock_sharable` but with a std-compatible interface
    //! 
    bool try_lock_shared()
    {  return this->try_lock_sharable();  }
 
    //!Requires: The calling thread does not own the mutex.
    //!
    //!Effects: The calling thread tries to acquire sharable ownership of the mutex
    //!   waiting if necessary until no other thread has exclusive
    //!   ownership of the mutex or abs_time is reached.
    //!Returns: If acquires sharable ownership, returns true. Otherwise returns false.
    //!Throws: interprocess_exception on error.
    //!
    //!Note: A program may deadlock if the thread that has ownership calls 
    //!   this function. If the implementation can detect the deadlock,
    //!   an exception could be thrown
    template<class TimePoint>
    bool timed_lock_sharable(const TimePoint &abs_time);
 
    //!Same as `timed_lock_sharable`, but this function is modeled after the
    //!standard library interface.
    template<class TimePoint> bool try_lock_shared_until(const TimePoint &abs_time)
    {  return this->timed_lock_sharable(abs_time);  }
 
    //!Same as `timed_lock_sharable`, but this function is modeled after the
    //!standard library interface.
    template<class Duration>  bool try_lock_shared_for(const Duration &dur)
    {  return this->timed_lock_sharable(ipcdetail::duration_to_ustime(dur)); }
 
    //!Precondition: The thread must have sharable ownership of the mutex.
    //!Effects: The calling thread releases the sharable ownership of the mutex.
    //!Throws: An exception derived from interprocess_exception on error.
    void unlock_sharable();
 
    //!Same as `unlock_sharable` but with a std-compatible interface
    //! 
    void unlock_shared()
    {  this->unlock_sharable();  }
 
    //!Erases a named sharable mutex from the system.
    //!Returns false on error. Never throws.
    static bool remove(const char *name);
 
    #if defined(BOOST_INTERPROCESS_WCHAR_NAMED_RESOURCES) || defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 
    //!Erases a named sharable mutex from the system.
    //!Returns false on error. Never throws.
    static bool remove(const wchar_t *name);
 
    #endif
 
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
    private:
    friend class ipcdetail::interprocess_tester;
    void dont_close_on_destruction();
 
    interprocess_sharable_mutex *mutex() const
    {  return static_cast<interprocess_sharable_mutex*>(m_shmem.get_user_address()); }
 
    typedef ipcdetail::managed_open_or_create_impl<shared_memory_object, 0, true, false> open_create_impl_t;
    open_create_impl_t m_shmem;
    typedef ipcdetail::named_creation_functor<interprocess_sharable_mutex> construct_func_t;
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 };
 
 #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 
 inline named_sharable_mutex::~named_sharable_mutex()
 {}
 
 inline named_sharable_mutex::named_sharable_mutex
    (create_only_t, const char *name, const permissions &perm)
    :  m_shmem  (create_only
                ,name
                ,sizeof(interprocess_sharable_mutex) +
                   open_create_impl_t::ManagedOpenOrCreateUserOffset
                ,read_write
                ,0
                ,construct_func_t(ipcdetail::DoCreate)
                ,perm)
 {}
 
 inline named_sharable_mutex::named_sharable_mutex
    (open_or_create_t, const char *name, const permissions &perm)
    :  m_shmem  (open_or_create
                ,name
                ,sizeof(interprocess_sharable_mutex) +
                   open_create_impl_t::ManagedOpenOrCreateUserOffset
                ,read_write
                ,0
                ,construct_func_t(ipcdetail::DoOpenOrCreate)
                ,perm)
 {}
 
 inline named_sharable_mutex::named_sharable_mutex
    (open_only_t, const char *name)
    :  m_shmem  (open_only
                ,name
                ,read_write
                ,0
                ,construct_func_t(ipcdetail::DoOpen))
 {}
 
 #if defined(BOOST_INTERPROCESS_WCHAR_NAMED_RESOURCES) || defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 
 inline named_sharable_mutex::named_sharable_mutex
    (create_only_t, const wchar_t *name, const permissions &perm)
    :  m_shmem  (create_only
                ,name
                ,sizeof(interprocess_sharable_mutex) +
                   open_create_impl_t::ManagedOpenOrCreateUserOffset
                ,read_write
                ,0
                ,construct_func_t(ipcdetail::DoCreate)
                ,perm)
 {}
 
 inline named_sharable_mutex::named_sharable_mutex
    (open_or_create_t, const wchar_t *name, const permissions &perm)
    :  m_shmem  (open_or_create
                ,name
                ,sizeof(interprocess_sharable_mutex) +
                   open_create_impl_t::ManagedOpenOrCreateUserOffset
                ,read_write
                ,0
                ,construct_func_t(ipcdetail::DoOpenOrCreate)
                ,perm)
 {}
 
 inline named_sharable_mutex::named_sharable_mutex
    (open_only_t, const wchar_t *name)
    :  m_shmem  (open_only
                ,name
                ,read_write
                ,0
                ,construct_func_t(ipcdetail::DoOpen))
 {}
 
 #endif
 
 inline void named_sharable_mutex::dont_close_on_destruction()
 {  ipcdetail::interprocess_tester::dont_close_on_destruction(m_shmem);  }
 
 inline void named_sharable_mutex::lock()
 {  this->mutex()->lock();  }
 
 inline void named_sharable_mutex::unlock()
 {  this->mutex()->unlock();  }
 
 inline bool named_sharable_mutex::try_lock()
 {  return this->mutex()->try_lock();  }
 
 template<class TimePoint>
 inline bool named_sharable_mutex::timed_lock
    (const TimePoint &abs_time)
 {  return this->mutex()->timed_lock(abs_time);  }
 
 inline void named_sharable_mutex::lock_sharable()
 {  this->mutex()->lock_sharable();  }
 
 inline void named_sharable_mutex::unlock_sharable()
 {  this->mutex()->unlock_sharable();  }
 
 inline bool named_sharable_mutex::try_lock_sharable()
 {  return this->mutex()->try_lock_sharable();  }
 
 template<class TimePoint>
 inline bool named_sharable_mutex::timed_lock_sharable
    (const TimePoint &abs_time)
 {  return this->mutex()->timed_lock_sharable(abs_time);  }
 
 inline bool named_sharable_mutex::remove(const char *name)
 {  return shared_memory_object::remove(name); }
 
 #if defined(BOOST_INTERPROCESS_WCHAR_NAMED_RESOURCES) || defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 
 inline bool named_sharable_mutex::remove(const wchar_t *name)
 {  return shared_memory_object::remove(name); }
 
 #endif //defined(BOOST_INTERPROCESS_WCHAR_NAMED_RESOURCES) || defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 
 #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
 }  //namespace interprocess {
 }  //namespace boost {
 
 #include <boost/interprocess/detail/config_end.hpp>
 
 #endif   //BOOST_INTERPROCESS_NAMED_SHARABLE_MUTEX_HPP

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