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240 lines
6.6 KiB
240 lines
6.6 KiB
/*
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Copyright 2005-2013 Intel Corporation. All Rights Reserved.
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This file is part of Threading Building Blocks.
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Threading Building Blocks is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation.
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Threading Building Blocks is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Threading Building Blocks; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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As a special exception, you may use this file as part of a free software
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library without restriction. Specifically, if other files instantiate
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templates or use macros or inline functions from this file, or you compile
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this file and link it with other files to produce an executable, this
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file does not by itself cause the resulting executable to be covered by
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the GNU General Public License. This exception does not however
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invalidate any other reasons why the executable file might be covered by
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the GNU General Public License.
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*/
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#ifndef __TBB_mutex_H
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#define __TBB_mutex_H
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#if _WIN32||_WIN64
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#include "machine/windows_api.h"
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#else
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#include <pthread.h>
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#endif /* _WIN32||_WIN64 */
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#include <new>
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#include "aligned_space.h"
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#include "tbb_stddef.h"
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#include "tbb_profiling.h"
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namespace tbb {
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//! Wrapper around the platform's native reader-writer lock.
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/** For testing purposes only.
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@ingroup synchronization */
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class mutex {
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public:
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//! Construct unacquired mutex.
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mutex() {
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#if TBB_USE_ASSERT || TBB_USE_THREADING_TOOLS
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internal_construct();
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#else
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#if _WIN32||_WIN64
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InitializeCriticalSectionEx(&impl, 4000, 0);
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#else
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int error_code = pthread_mutex_init(&impl,NULL);
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if( error_code )
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tbb::internal::handle_perror(error_code,"mutex: pthread_mutex_init failed");
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#endif /* _WIN32||_WIN64*/
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#endif /* TBB_USE_ASSERT */
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};
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~mutex() {
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#if TBB_USE_ASSERT
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internal_destroy();
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#else
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#if _WIN32||_WIN64
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DeleteCriticalSection(&impl);
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#else
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pthread_mutex_destroy(&impl);
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#endif /* _WIN32||_WIN64 */
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#endif /* TBB_USE_ASSERT */
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};
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class scoped_lock;
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friend class scoped_lock;
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//! The scoped locking pattern
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/** It helps to avoid the common problem of forgetting to release lock.
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It also nicely provides the "node" for queuing locks. */
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class scoped_lock : internal::no_copy {
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public:
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//! Construct lock that has not acquired a mutex.
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scoped_lock() : my_mutex(NULL) {};
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//! Acquire lock on given mutex.
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scoped_lock( mutex& mutex ) {
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acquire( mutex );
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}
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//! Release lock (if lock is held).
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~scoped_lock() {
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if( my_mutex )
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release();
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}
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//! Acquire lock on given mutex.
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void acquire( mutex& mutex ) {
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#if TBB_USE_ASSERT
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internal_acquire(mutex);
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#else
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mutex.lock();
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my_mutex = &mutex;
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#endif /* TBB_USE_ASSERT */
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}
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//! Try acquire lock on given mutex.
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bool try_acquire( mutex& mutex ) {
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#if TBB_USE_ASSERT
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return internal_try_acquire (mutex);
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#else
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bool result = mutex.try_lock();
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if( result )
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my_mutex = &mutex;
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return result;
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#endif /* TBB_USE_ASSERT */
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}
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//! Release lock
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void release() {
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#if TBB_USE_ASSERT
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internal_release ();
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#else
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my_mutex->unlock();
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my_mutex = NULL;
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#endif /* TBB_USE_ASSERT */
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}
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private:
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//! The pointer to the current mutex to work
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mutex* my_mutex;
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//! All checks from acquire using mutex.state were moved here
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void __TBB_EXPORTED_METHOD internal_acquire( mutex& m );
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//! All checks from try_acquire using mutex.state were moved here
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bool __TBB_EXPORTED_METHOD internal_try_acquire( mutex& m );
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//! All checks from release using mutex.state were moved here
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void __TBB_EXPORTED_METHOD internal_release();
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friend class mutex;
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};
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// Mutex traits
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static const bool is_rw_mutex = false;
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static const bool is_recursive_mutex = false;
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static const bool is_fair_mutex = false;
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// ISO C++0x compatibility methods
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//! Acquire lock
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void lock() {
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#if TBB_USE_ASSERT
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aligned_space<scoped_lock,1> tmp;
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new(tmp.begin()) scoped_lock(*this);
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#else
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#if _WIN32||_WIN64
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EnterCriticalSection(&impl);
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#else
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pthread_mutex_lock(&impl);
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#endif /* _WIN32||_WIN64 */
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#endif /* TBB_USE_ASSERT */
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}
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//! Try acquiring lock (non-blocking)
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/** Return true if lock acquired; false otherwise. */
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bool try_lock() {
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#if TBB_USE_ASSERT
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aligned_space<scoped_lock,1> tmp;
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scoped_lock& s = *tmp.begin();
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s.my_mutex = NULL;
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return s.internal_try_acquire(*this);
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#else
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#if _WIN32||_WIN64
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return TryEnterCriticalSection(&impl)!=0;
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#else
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return pthread_mutex_trylock(&impl)==0;
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#endif /* _WIN32||_WIN64 */
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#endif /* TBB_USE_ASSERT */
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}
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//! Release lock
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void unlock() {
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#if TBB_USE_ASSERT
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aligned_space<scoped_lock,1> tmp;
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scoped_lock& s = *tmp.begin();
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s.my_mutex = this;
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s.internal_release();
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#else
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#if _WIN32||_WIN64
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LeaveCriticalSection(&impl);
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#else
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pthread_mutex_unlock(&impl);
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#endif /* _WIN32||_WIN64 */
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#endif /* TBB_USE_ASSERT */
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}
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//! Return native_handle
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#if _WIN32||_WIN64
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typedef LPCRITICAL_SECTION native_handle_type;
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#else
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typedef pthread_mutex_t* native_handle_type;
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#endif
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native_handle_type native_handle() { return (native_handle_type) &impl; }
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enum state_t {
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INITIALIZED=0x1234,
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DESTROYED=0x789A,
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HELD=0x56CD
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};
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private:
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#if _WIN32||_WIN64
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CRITICAL_SECTION impl;
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enum state_t state;
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#else
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pthread_mutex_t impl;
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#endif /* _WIN32||_WIN64 */
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//! All checks from mutex constructor using mutex.state were moved here
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void __TBB_EXPORTED_METHOD internal_construct();
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//! All checks from mutex destructor using mutex.state were moved here
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void __TBB_EXPORTED_METHOD internal_destroy();
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#if _WIN32||_WIN64
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public:
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//! Set the internal state
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void set_state( state_t to ) { state = to; }
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#endif
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};
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__TBB_DEFINE_PROFILING_SET_NAME(mutex)
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} // namespace tbb
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#endif /* __TBB_mutex_H */
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