mutex.h

/*
    Copyright 2005-2009 Intel Corporation.  All Rights Reserved.

    The source code contained or described herein and all documents related
    to the source code ("Material") are owned by Intel Corporation or its
    suppliers or licensors.  Title to the Material remains with Intel
    Corporation or its suppliers and licensors.  The Material is protected
    by worldwide copyright laws and treaty provisions.  No part of the
    Material may be used, copied, reproduced, modified, published, uploaded,
    posted, transmitted, distributed, or disclosed in any way without
    Intel's prior express written permission.

    No license under any patent, copyright, trade secret or other
    intellectual property right is granted to or conferred upon you by
    disclosure or delivery of the Materials, either expressly, by
    implication, inducement, estoppel or otherwise.  Any license under such
    intellectual property rights must be express and approved by Intel in
    writing.
*/

#ifndef __TBB_mutex_H
#define __TBB_mutex_H

#if _WIN32||_WIN64
#include <windows.h>
#if !defined(_WIN32_WINNT)
// The following Windows API function is declared explicitly;
// otherwise any user would have to specify /D_WIN32_WINNT=0x0400
extern "C" BOOL WINAPI TryEnterCriticalSection( LPCRITICAL_SECTION );
#endif

#else /* if not _WIN32||_WIN64 */
#include <pthread.h>
namespace tbb { namespace internal {
// Use this internal TBB function to throw an exception
extern void handle_perror( int error_code, const char* what );
} } //namespaces
#endif /* _WIN32||_WIN64 */

#include "tbb_stddef.h"
#include "tbb_profiling.h"

namespace tbb {


class mutex {
public:
    mutex() {
#if TBB_USE_ASSERT || TBB_USE_THREADING_TOOLS
    internal_construct();
#else
  #if _WIN32||_WIN64
        InitializeCriticalSection(&impl);
  #else
        int error_code = pthread_mutex_init(&impl,NULL);
        if( error_code )
            tbb::internal::handle_perror(error_code,"mutex: pthread_mutex_init failed");
  #endif /* _WIN32||_WIN64*/
#endif /* TBB_USE_ASSERT */
    };

    ~mutex() {
#if TBB_USE_ASSERT
        internal_destroy();
#else
  #if _WIN32||_WIN64
        DeleteCriticalSection(&impl);
  #else
        pthread_mutex_destroy(&impl); 

  #endif /* _WIN32||_WIN64 */
#endif /* TBB_USE_ASSERT */
    };

    class scoped_lock;
    friend class scoped_lock;


    class scoped_lock : internal::no_copy {
    public:
        scoped_lock() : my_mutex(NULL) {};


        scoped_lock( mutex& mutex ) {
            acquire( mutex );
        }

        ~scoped_lock() {
            if( my_mutex ) 
                release();
        }

        void acquire( mutex& mutex ) {
#if TBB_USE_ASSERT
            internal_acquire(mutex);
#else
            my_mutex = &mutex;
  #if _WIN32||_WIN64
            EnterCriticalSection(&mutex.impl);
  #else
            pthread_mutex_lock(&mutex.impl);
  #endif /* _WIN32||_WIN64 */
#endif /* TBB_USE_ASSERT */
        }

        bool try_acquire( mutex& mutex ) {
#if TBB_USE_ASSERT
            return internal_try_acquire (mutex);
#else
            bool result;
  #if _WIN32||_WIN64
            result = TryEnterCriticalSection(&mutex.impl)!=0;
  #else
            result = pthread_mutex_trylock(&mutex.impl)==0;
  #endif /* _WIN32||_WIN64 */
            if( result )
                my_mutex = &mutex;
            return result;
#endif /* TBB_USE_ASSERT */
        }

        void release() {
#if TBB_USE_ASSERT
            internal_release ();
#else
  #if _WIN32||_WIN64
            LeaveCriticalSection(&my_mutex->impl);
  #else
            pthread_mutex_unlock(&my_mutex->impl);
  #endif /* _WIN32||_WIN64 */
            my_mutex = NULL;
#endif /* TBB_USE_ASSERT */
        }

    private:
        mutex* my_mutex;

        void __TBB_EXPORTED_METHOD internal_acquire( mutex& m );

        bool __TBB_EXPORTED_METHOD internal_try_acquire( mutex& m );

        void __TBB_EXPORTED_METHOD internal_release();
    };

    // Mutex traits
    static const bool is_rw_mutex = false;
    static const bool is_recursive_mutex = false;
    static const bool is_fair_mutex = false;

private:
#if _WIN32||_WIN64
    CRITICAL_SECTION impl;    
    enum state_t {
        INITIALIZED=0x1234,
        DESTROYED=0x789A,
        HELD=0x56CD
    } state;
#else
    pthread_mutex_t impl;
#endif /* _WIN32||_WIN64 */

    void __TBB_EXPORTED_METHOD internal_construct();

    void __TBB_EXPORTED_METHOD internal_destroy();
};

__TBB_DEFINE_PROFILING_SET_NAME(mutex)

} // namespace tbb 

#endif /* __TBB_mutex_H */

---

Copyright © 2005-2009 Intel Corporation. All Rights Reserved.

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