123 lines
2.6 KiB
C++
123 lines
2.6 KiB
C++
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// Copyright (C) 1996-1997 Microsoft Corporation. All rights reserved.
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#include "header.h"
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static DWORD thrdID;
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static HANDLE hThrd;
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static HANDLE hsemThread;
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static int ThreadPriority;
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static THRD_COMMAND ThreadCommand;
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static void* pThreadParam;
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static DWORD WINAPI WorkerThread(LPVOID pParam);
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BOOL ActivateThread(THRD_COMMAND cmd, void* pParam, int priority)
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{
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if (!hThrd) {
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if (cmd == THRD_TERMINATE) // don't start the thread just to kill it
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return FALSE;
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if (!hsemThread)
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hsemThread = CreateSemaphore(NULL, 0, 1, NULL);
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hThrd = CreateThread(NULL, 0, &WorkerThread, NULL,
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0, &thrdID);
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if (!hThrd) {
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OOM();
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return FALSE;
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}
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SetThreadPriority(hThrd, ThreadPriority = priority);
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}
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if (g_fThreadRunning)
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return FALSE;
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if (g_fDualCPU == -1) { // haven't initialized it yet
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HKEY hkey;
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if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,
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"HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\1", 0,
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KEY_READ, &hkey) == ERROR_SUCCESS) {
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g_fDualCPU = TRUE;
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RegCloseKey(hkey);
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}
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else
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g_fDualCPU = FALSE;
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}
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// For multiple CPU's, we can use a normal priority for threads
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if (g_fDualCPU && (priority == THREAD_PRIORITY_IDLE ||
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priority == THREAD_PRIORITY_LOWEST ||
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priority == THREAD_PRIORITY_BELOW_NORMAL))
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priority = THREAD_PRIORITY_NORMAL;
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if (ThreadPriority != priority)
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SetThreadPriority(hThrd, ThreadPriority = priority);
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ThreadCommand = cmd;
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pThreadParam = pParam;
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g_fThreadRunning = TRUE;
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ReleaseSemaphore(hsemThread, 1, NULL);
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return TRUE;
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}
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/***************************************************************************
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FUNCTION: WaitForThread
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PURPOSE: Find out if the worker thread is running. If it is, and
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the command is anything other then THRD_ANY, then kick
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up the thread priority and wait for it to finish.
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PARAMETERS:
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cmd
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RETURNS:
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COMMENTS:
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MODIFICATION DATES:
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04-Jun-1997 [ralphw]
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***************************************************************************/
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BOOL WaitForThread(THRD_COMMAND cmd)
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{
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if (!g_fThreadRunning)
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return TRUE;
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else if (cmd != THRD_ANY && cmd != ThreadCommand)
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return FALSE;
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// Kick the thread to a high priority, and wait for it to complete
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SetThreadPriority(hThrd, THREAD_PRIORITY_HIGHEST);
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{
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CHourGlass waitcur;
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while (g_fThreadRunning)
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Sleep(200);
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}
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SetThreadPriority(hThrd, ThreadPriority);
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return TRUE;
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}
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static DWORD WINAPI WorkerThread(LPVOID pParam)
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{
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for (;;) {
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if (WaitForSingleObject(hsemThread, INFINITE) != WAIT_OBJECT_0)
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return (UINT) -1;
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switch (ThreadCommand) {
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case THRD_TERMINATE:
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g_fThreadRunning = FALSE;
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thrdID = 0;
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hThrd = NULL;
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ExitThread(0);
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break;
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}
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g_fThreadRunning = FALSE;
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}
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}
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