windows/SysThread.cpp

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/******************************************************************************/
/* REXX Kernel                                              SysThread.cpp     */
/*                                                                            */
/* Windows implementation of the SysThread class.                             */
/*                                                                            */
/******************************************************************************/
 
#include "windows.h"
#include "SysThread.hpp"
 
DWORD WINAPI call_thread_function(void * arguments)
{
    ((SysThread *)arguments)->dispatch();
   return 0;
}
 
// create a new thread and attach to an activity
void SysThread::createThread()
{
    _threadHandle = CreateThread(NULL, THREAD_STACK_SIZE, call_thread_function, this, 0, &_threadID);
    // we created this one
    attached = false;
}
 
void SysThread::dispatch()
{
    // default dispatch returns immediately
}
 
// attach an activity to an existing thread
void SysThread::attachThread()
{
    // initialize the thread basics
    _threadID = GetCurrentThreadId();
    _threadHandle = GetCurrentThread();
    attached = true;           // we don't own this one (and don't terminate it)
}
 
void SysThread::setPriority(ThreadPriority priority)
{
    int pri = THREAD_PRIORITY_NORMAL;
                                         /* critical priority?                */
    switch (priority)
    {
        case HIGH_PRIORITY:       // critical priority
            pri= THREAD_PRIORITY_ABOVE_NORMAL+1; /* the class is regular, but move    */
                                                 /* to the head of the class          */
                                                 /* medium priority                   */
            break;
 
        case GUARDED_PRIORITY:
            pri = THREAD_PRIORITY_NORMAL+1;    /* guard priority is just above normal*/
            break;
 
        case MEDIUM_PRIORITY:
            pri = THREAD_PRIORITY_NORMAL;      /* normal class,                     */
                                               /* dead in the middle of it all      */
            break;
 
        case LOW_PRIORITY:
            pri = THREAD_PRIORITY_IDLE +1;     /* give us idle only, but make it    */
            break;
                                               /* important idle time only          */
    }
    SetThreadPriority(_threadHandle, pri);
}
 
 
char *SysThread::getStackBase()
/******************************************************************************/
/* Function:  Return a pointer to the current stack base                      */
/******************************************************************************/
{
   int32_t temp;
   return ((char *)(&temp)) - THREAD_STACK_SIZE;
}
 
 
void SysThread::terminate()
/******************************************************************************/
/* Function:  Do any platform specific thread termination                     */
/******************************************************************************/
{
    if (!attached && _threadHandle != INVALID_HANDLE_VALUE)
    {
        CloseHandle(_threadHandle);     // close the thread handle
        _threadHandle = INVALID_HANDLE_VALUE;
    }
}
 
 
void SysThread::startup()
/******************************************************************************/
/* Function:  Do any platform specific thread initialization                  */
/******************************************************************************/
{
    // this is a nop on Windows;
}
 
 
void SysThread::shutdown()
/******************************************************************************/
/* Function:  Do any platform specific thread shutdown activities.  This      */
/* replaces the WindowEnv stuff in prior releases.                            */
/******************************************************************************/
{
    // this is a nop on Windows;
}
 
 
void SysThread::yield()
/******************************************************************************/
/* Function:  Yield control to other threads.                                 */
/******************************************************************************/
{
    // this is a nop on Windows;
}
 
 
bool SysThread::equals(SysThread &other)
/******************************************************************************/
/* Function:  Yield dispatching control to other threads.                     */
/******************************************************************************/
{
    return _threadID == other._threadID;
}