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230 lines
4.2 KiB
230 lines
4.2 KiB
/*++
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Copyright (c) 1998 Microsoft Corporation
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Module Name:
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tpsutil.cpp
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Abstract:
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Comtains common utility functions for Win32 thread pool services
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Contents:
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StartThread
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TpsEnter
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QueueNullFunc
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(NullFunc)
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Author:
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Richard L Firth (rfirth) 10-Feb-1998
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Environment:
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Win32 user-mode
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Notes:
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Taken from NT-specific code written by Gurdeep Singh Pall (gurdeep)
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Revision History:
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10-Feb-1998 rfirth
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Created
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--*/
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#include "priv.h"
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#include "threads.h"
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//
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// private prototypes
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//
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PRIVATE
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VOID
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NullFunc(
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IN LPVOID pUnused
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);
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//
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// functions
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//
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DWORD
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StartThread(
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IN LPTHREAD_START_ROUTINE pfnFunction,
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OUT PHANDLE phThread,
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IN BOOL fSynchronize
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)
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/*++
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Routine Description:
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This routine is used start a new thread in the pool. If required, we
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synchronize with the new thread using an auto-reset event that the new
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thread must signal once it has completed its initialization
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Arguments:
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pfnFunction - pointer to thread function to start
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phThread - pointer to returned thread handle
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fSynchronize - used to indicate if we need to synchronize with the new
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thread before returning
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Return Value:
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DWORD
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Success - ERROR_SUCCESS
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Failure - ERROR_NOT_ENOUGH_MEMORY
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Out of memory
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--*/
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{
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HANDLE hSyncEvent = NULL;
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if (fSynchronize) {
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hSyncEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
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if (hSyncEvent == NULL) {
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return GetLastError();
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}
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}
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DWORD dwThreadId;
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HANDLE hThread;
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DWORD error = ERROR_SUCCESS;
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hThread = CreateThread(NULL, // lpSecurityAttributes
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0, // dwStackSize (0 == same as init thread)
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pfnFunction,
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(LPVOID)hSyncEvent,
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0, // dwCreationFlags
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&dwThreadId // throw away
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);
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if (hThread == NULL) {
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error = GetLastError();
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}
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if (hSyncEvent != NULL) {
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if (hThread != NULL) {
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DWORD status = WaitForSingleObject(hSyncEvent, INFINITE);
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if (status == WAIT_FAILED) {
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error = GetLastError();
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} else if (status == WAIT_TIMEOUT) {
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error = WAIT_TIMEOUT;
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} else if (status != WAIT_OBJECT_0) {
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error = ERROR_GEN_FAILURE; // ?
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}
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if (ERROR_SUCCESS != error)
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{
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CloseHandle(hThread);
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hThread = NULL;
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}
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}
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CloseHandle(hSyncEvent);
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}
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*phThread = hThread;
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return error;
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}
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DWORD
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TpsEnter(
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VOID
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)
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/*++
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Routine Description:
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synchronize with thread shutting down via SHTerminateThreadPool(). If
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terminating because DLL is unloaded, return error else wait until
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termination completed
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Arguments:
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None.
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Return Value:
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DWORD
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Success - ERROR_SUCCESS
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Failure - ERROR_SHUTDOWN_IN_PROGRESS
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--*/
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{
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for (; ; ) {
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while (g_bTpsTerminating) {
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if (g_bDllTerminating) {
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return ERROR_SHUTDOWN_IN_PROGRESS; // error code? looks valid -justmann
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}
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SleepEx(0, TRUE);
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}
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InterlockedIncrement((LPLONG)&g_ActiveRequests);
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if (!g_bTpsTerminating) {
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return ERROR_SUCCESS;
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}
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ASSERT( 0 != g_ActiveRequests );
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InterlockedDecrement((LPLONG)&g_ActiveRequests);
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}
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}
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VOID
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QueueNullFunc(
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IN HANDLE hThread
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)
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/*++
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Routine Description:
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Queues NullFunc as an APC to hThread
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Arguments:
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hThread - thread to queue for
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Return Value:
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None.
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--*/
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{
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QueueUserAPC((PAPCFUNC)NullFunc, hThread, NULL);
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}
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PRIVATE
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VOID
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NullFunc(
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IN LPVOID pUnused
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)
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/*++
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Routine Description:
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NULL APC function. Used to allow TerminateThreadPool() to wake up dormant
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APC threads
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Arguments:
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pUnused - unused argument pointer
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Return Value:
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None.
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--*/
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{
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}
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