/*----------------------------------------------------------------------------  ChucK Concurrent, On-the-fly Audio Programming Language    Compiler and Virtual Machine   Copyright (c) 2004 Ge Wang and Perry R. Cook.  All rights reserved.    http://chuck.stanford.edu/    http://chuck.cs.princeton.edu/   This program is free software; you can redistribute it and/or modify  it under the terms of the GNU General Public License as published by  the Free Software Foundation; either version 2 of the License, or  (at your option) any later version.   This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the  GNU General Public License for more details.   You should have received a copy of the GNU General Public License  along with this program; if not, write to the Free Software  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  U.S.A.-----------------------------------------------------------------------------*/ //-----------------------------------------------------------------------------// name: util_thread.h// desc: thread utilities//// authors: Ge Wang (ge@ccrma.stanford.edu | gewang@cs.princeton.edu)// based on STK's Thread//          Perry R. Cook + Gary Scavone// date: autumn 2004//-----------------------------------------------------------------------------#ifndef __UTIL_THREAD_H__#define __UTIL_THREAD_H__ #include "chuck_def.h"#include <stdio.h>  // forward declaration to break circular dependenciesclass FastCircularBuffer;template<typename T> class CircularBuffer;  #if ( defined(__PLATFORM_MACOSX__) || defined(__PLATFORM_LINUX__) || defined(__PLATFORM_OPENBSD__) || defined(__WINDOWS_PTHREAD__) )  #include <pthread.h>  #define THREAD_TYPE  typedef pthread_t THREAD_HANDLE;  typedef void * THREAD_RETURN;  typedef void * (*THREAD_FUNCTION)(void *);  typedef pthread_mutex_t MUTEX;  #define CHUCK_THREAD pthread_t#elif defined(__PLATFORM_WIN32__)  #include <windows.h>  #include <process.h>  #define THREAD_TYPE __stdcall  typedef unsigned long THREAD_HANDLE;  typedef unsigned THREAD_RETURN;  typedef unsigned (__stdcall *THREAD_FUNCTION)(void *);  typedef CRITICAL_SECTION MUTEX;  #define CHUCK_THREAD HANDLE#endif    //-----------------------------------------------------------------------------// name: struct XThread// desc: ...//-----------------------------------------------------------------------------struct XThread{public:    XThread();    ~XThread(); public:    // begin execution of the thread routine    // the thread routine can be passed an argument via ptr    bool start( THREAD_FUNCTION routine, void * ptr = NULL );     // wait the specified number of milliseconds for the thread to terminate    bool wait( long milliseconds = -1, bool cancel = true ); public:    // test for a thread cancellation request.    static void test();     // get thread ID from a handle    static t_CKUINT getID( THREAD_HANDLE t ); public:    // get internal thread reference    THREAD_HANDLE getThread() { return thread; }    // get thread ID    t_CKUINT getID() { return getID( thread ); }     // clear    void clear() { thread = 0; } protected:    THREAD_HANDLE thread;};    //-----------------------------------------------------------------------------// name: struct XThreadUtil// desc: general thread utility//-----------------------------------------------------------------------------struct XThreadUtil{public:    // set priority on thread    static t_CKBOOL set_priority( CHUCK_THREAD tid, t_CKINT priority );    // set priority on current thread    static t_CKBOOL set_priority( t_CKINT priority );    // get max allowable system priority    static t_CKINT get_max_priority();    // get min allowable system priority    static t_CKINT get_min_priority(); public:    // not sure what this exactly    static t_CKINT our_priority;};    //-----------------------------------------------------------------------------// name: struct XMutex// desc: ...//-----------------------------------------------------------------------------struct XMutex{public:    XMutex();    ~XMutex(); public:    void acquire( );    void release(void); protected:    MUTEX mutex;};    //-----------------------------------------------------------------------------// name: XWriteThread()// desc: utility class for scheduling writes to be executed on a separate//       thread.//-----------------------------------------------------------------------------class XWriteThread{public:    // get the shared instance    static XWriteThread * shared();    // static buffer size    const static size_t PRODUCER_BUFFER_SIZE; public:    // constructor    XWriteThread( size_t data_buffer_size = 4096, size_t msg_buffer_size = 32 ); public:    size_t fwrite( const void * ptr, size_t size, size_t nitems, FILE * stream );    int fseek( FILE * stream, long offset, int whence );    int fflush( FILE * stream );    int fclose( FILE * stream );     // DO NOT DELETE INSTANCES OF XWriteThread    // instead call shutdown and they will be cleaned up in the background    void shutdown(); private:    // DO NOT DELETE INSTANCES OF XWriteThread    // instead call shutdown and they will be cleaned up in the background    ~XWriteThread();     // flush    void flush_data_buffer();     // callback#if ( defined(__PLATFORM_MACOSX__) || defined(__PLATFORM_LINUX__) || defined(__WINDOWS_PTHREAD__) || defined(__PLATFORM_OPENBSD__) )    static void * write_cb( void * _thiss );#elif defined(__PLATFORM_WIN32__)    static unsigned THREAD_TYPE write_cb( void * _thiss );#endif     // shared instance    static XWriteThread * o_defaultWriteThread; private:    t_CKBOOL m_thread_exit;    XThread m_thread;    FastCircularBuffer * m_data_buffer;    size_t m_bytes_in_buffer;    t_CKBYTE * m_thread_buffer;    FILE * m_stream;     // internal message format    struct Message    {        // operation type        enum        {            NONE,            WRITE,            SEEK,            FLUSH,            CLOSE,            SHUTDOWN        } operation;         // file pointer        FILE * file;         // size / offset        union        {            struct            {                size_t data_size;            } write;             struct            {                long offset;                int whence;            } seek;        };         // 1.4.1.0 (ge) added        Message() : file(NULL) { seek.offset = 0; operation = NONE; }    };     // circular buffer    CircularBuffer<Message> * m_msg_buffer;};    #endif