/*

     File: CAPThread.h 

 Abstract:  Part of CoreAudio Utility Classes  

  Version: 1.01 

 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple 

 Inc. ("Apple") in consideration of your agreement to the following 

 terms, and your use, installation, modification or redistribution of 

 this Apple software constitutes acceptance of these terms.  If you do 

 not agree with these terms, please do not use, install, modify or 

 redistribute this Apple software. 

 In consideration of your agreement to abide by the following terms, and 

 subject to these terms, Apple grants you a personal, non-exclusive 

 license, under Apple's copyrights in this original Apple software (the 

 "Apple Software"), to use, reproduce, modify and redistribute the Apple 

 Software, with or without modifications, in source and/or binary forms; 

 provided that if you redistribute the Apple Software in its entirety and 

 without modifications, you must retain this notice and the following 

 text and disclaimers in all such redistributions of the Apple Software. 

 Neither the name, trademarks, service marks or logos of Apple Inc. may 

 be used to endorse or promote products derived from the Apple Software 

 without specific prior written permission from Apple.  Except as 

 expressly stated in this notice, no other rights or licenses, express or 

 implied, are granted by Apple herein, including but not limited to any 

 patent rights that may be infringed by your derivative works or by other 

 works in which the Apple Software may be incorporated. 

 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE 

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 

 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS 

 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND 

 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. 

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL 

 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 

 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 

 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, 

 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED 

 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), 

 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE 

 POSSIBILITY OF SUCH DAMAGE. 

 Copyright (C) 2012 Apple Inc. All Rights Reserved. 

*/

#if !defined(__CAPThread_h__)

#define __CAPThread_h__

//==================================================================================================

//  Includes

//==================================================================================================

//  System Includes

#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)

    #include <CoreFoundation/CFBase.h>

#else

    #include <CFBase.h>

#endif

#if TARGET_OS_MAC

    #include <pthread.h>

    #include <unistd.h>

#elif TARGET_OS_WIN32

    #include <windows.h>

#else

    #error  Unsupported operating system

#endif

//==================================================================================================

//  CAPThread

//

//  This class wraps a pthread and a Win32 thread.

//  caution: long-running fixed priority threads can make the system unresponsive

//==================================================================================================

class   CAPThread

{

//  Types

public:

    typedef void*           (*ThreadRoutine)(void* inParameter);

//  Constants

public:

    enum

    {

#if TARGET_OS_MAC

                            kMinThreadPriority = 1,

                            kMaxThreadPriority = 63,

                            kDefaultThreadPriority = 31,

                            kMaxThreadNameLength = 64

#elif TARGET_OS_WIN32

                            kMinThreadPriority = 1,

                            kMaxThreadPriority = 31,

                            kDefaultThreadPriority = THREAD_PRIORITY_NORMAL,

                            kMaxThreadNameLength = 256

#endif

    };

//  Construction/Destruction

public:

                            CAPThread(ThreadRoutine inThreadRoutine, void* inParameter, UInt32 inPriority = kDefaultThreadPriority, bool inFixedPriority=false, bool inAutoDelete=false, const char* inThreadName = NULL);

                            CAPThread(ThreadRoutine inThreadRoutine, void* inParameter, UInt32 inPeriod, UInt32 inComputation, UInt32 inConstraint, bool inIsPreemptible, bool inAutoDelete=false, const char* inThreadName = NULL);

    virtual                 ~CAPThread();

//  Properties

public:

#if TARGET_OS_MAC

    typedef pthread_t       NativeThread;

    NativeThread            GetNativeThread() { return mPThread; }

    static NativeThread     GetCurrentThread() { return pthread_self(); }

    static bool             IsNativeThreadsEqual(NativeThread a, NativeThread b) { return (a==b); }

    bool                    operator==(NativeThread b) { return pthread_equal(mPThread,b); }

    pthread_t               GetPThread() const { return mPThread; }

    bool                    IsCurrentThread() const { return (0 != mPThread) && (pthread_self() == mPThread); }

    bool                    IsRunning() const { return 0 != mPThread; }

#elif TARGET_OS_WIN32

    typedef unsigned long   NativeThread;

    NativeThread            GetNativeThread() { return mThreadID; }

    static NativeThread     GetCurrentThread() { return GetCurrentThreadId(); }

    static bool             IsNativeThreadsEqual(NativeThread a, NativeThread b) { return (a==b); }

    bool                    operator ==(NativeThread b) { return (mThreadID==b); }

    HANDLE                  GetThreadHandle() const { return mThreadHandle; }

    UInt32                  GetThreadID() const { return mThreadID; }

    bool                    IsCurrentThread() const { return (0 != mThreadID) && (GetCurrentThreadId() == mThreadID); }

    bool                    IsRunning() const { return 0 != mThreadID; }

#endif

    bool                    IsTimeShareThread() const { return !mTimeConstraintSet; }

    bool                    IsTimeConstraintThread() const { return mTimeConstraintSet; }

    UInt32                  GetPriority() const { return mPriority; }

    UInt32                  GetScheduledPriority();

    static UInt32           GetScheduledPriority(NativeThread thread);

    void                    SetPriority(UInt32 inPriority, bool inFixedPriority=false);

    void                    GetTimeConstraints(UInt32& outPeriod, UInt32& outComputation, UInt32& outConstraint, bool& outIsPreemptible) const { outPeriod = mPeriod; outComputation = mComputation; outConstraint = mConstraint; outIsPreemptible = mIsPreemptible; }

    void                    SetTimeConstraints(UInt32 inPeriod, UInt32 inComputation, UInt32 inConstraint, bool inIsPreemptible);

    void                    ClearTimeConstraints() { SetPriority(mPriority); }

    bool                    WillAutoDelete() const { return mAutoDelete; }

    void                    SetAutoDelete(bool b) { mAutoDelete = b; }

    void                    SetName(const char* inThreadName);

#if CoreAudio_Debug 

    void                    DebugPriority(const char *label);

#endif

//  Actions

public:

    virtual void            Start();

//  Implementation

protected:

#if TARGET_OS_MAC

    static void*            Entry(CAPThread* inCAPThread);

    static UInt32           getScheduledPriority(pthread_t inThread, int inPriorityKind);

#elif TARGET_OS_WIN32

    static UInt32 WINAPI    Entry(CAPThread* inCAPThread);

#endif

#if TARGET_OS_MAC

    pthread_t               mPThread;

    UInt32                  mSpawningThreadPriority;

#elif TARGET_OS_WIN32

    HANDLE                  mThreadHandle;

    unsigned long           mThreadID;

#endif

    ThreadRoutine           mThreadRoutine;

    void*                   mThreadParameter;

    char                    mThreadName[kMaxThreadNameLength];

    SInt32                  mPriority;

    UInt32                  mPeriod;

    UInt32                  mComputation;

    UInt32                  mConstraint;

    bool                    mIsPreemptible;

    bool                    mTimeConstraintSet;

    bool                    mFixedPriority;

    bool                    mAutoDelete;        // delete self when thread terminates

};

#endif