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| #include <windows.h>
#include <tchar.h>
#include <stdio.h>
//
// Thread pool wait callback function template
//
VOID
CALLBACK
MyWaitCallback(
PTP_CALLBACK_INSTANCE Instance,
PVOID Parameter,
PTP_WAIT Wait,
TP_WAIT_RESULT WaitResult
)
{
//
// Do something when the wait is over.
//
_tprintf(_T("MyWaitCallback: wait is over.\n"));
}
//
// Thread pool timer callback function template
//
VOID
CALLBACK
MyTimerCallback(
PTP_CALLBACK_INSTANCE Instance,
PVOID Parameter,
PTP_TIMER Timer
)
{
//
// Do something when the timer fires.
//
_tprintf(_T("MyTimerCallback: timer has fired.\n"));
}
//
// This is the thread pool work callback function.
// The callback demonstrates correct behavior when changing the
// state of the thread inside the callback function.
//
// Any changes to the thread state must be restored to original
// before exiting the callback routine.
//
VOID
CALLBACK
MyWorkCallback(
PTP_CALLBACK_INSTANCE Instance,
PVOID Parameter,
PTP_WORK Work
)
{
BOOL bRet = FALSE;
DWORD dwPriorityOriginal = 0;
//
// Record the original thread priority.
//
dwPriorityOriginal = GetThreadPriority(GetCurrentThread());
if (THREAD_PRIORITY_ERROR_RETURN == dwPriorityOriginal) {
_tprintf(_T("GetThreadPriority failed. LastError: %u\n"),
GetLastError());
return;
}
//
// Increase the priority of the thread pool thread.
//
bRet = SetThreadPriority(GetCurrentThread(),
THREAD_PRIORITY_ABOVE_NORMAL);
if (FALSE == bRet) {
_tprintf(_T("SetThreadPriority failed. LastError: %u\n"),
GetLastError());
return;
}
_tprintf(_T("MyWorkCallback: thread priority increased.\n"));
//
// Perform tasks at increased priority.
//
{
_tprintf(_T("MyWorkCallback: task performed at increased priority.\n"));
}
//
// Restore thread state by resetting the original priority.
//
bRet = SetThreadPriority(GetCurrentThread(),
dwPriorityOriginal);
//
// If restore fails, maybe retry or throw an exception. Otherwise,
// the thread will continue to execute other work items at increased
// priority.
//
if (FALSE == bRet) {
_tprintf(_T("Fatal Error! SetThreadPriority failed. LastError: %u\n"),
GetLastError());
return;
}
_tprintf(_T("MyWorkCallback: thread priority restored.\n"));
return;
}
VOID
DemoCleanupPersistentWorkTimer()
{
BOOL bRet = FALSE;
PTP_WORK work = NULL;
PTP_TIMER timer = NULL;
PTP_POOL pool = NULL;
PTP_WORK_CALLBACK workcallback = MyWorkCallback;
PTP_TIMER_CALLBACK timercallback = MyTimerCallback;
TP_CALLBACK_ENVIRON CallBackEnviron;
PTP_CLEANUP_GROUP cleanupgroup = NULL;
FILETIME FileDueTime;
ULARGE_INTEGER ulDueTime;
UINT rollback = 0;
InitializeThreadpoolEnvironment(&CallBackEnviron);
//
// Create a custom, dedicated thread pool.
//
pool = CreateThreadpool(NULL);
if (NULL == pool) {
_tprintf(_T("CreateThreadpool failed. LastError: %u\n"),
GetLastError());
goto main_cleanup;
}
rollback = 1; // pool creation succeeded
//
// The thread pool is made persistent simply by setting
// both the minimum and maximum threads to 1.
//
SetThreadpoolThreadMaximum(pool, 1);
bRet = SetThreadpoolThreadMinimum(pool, 1);
if (FALSE == bRet) {
_tprintf(_T("SetThreadpoolThreadMinimum failed. LastError: %u\n"),
GetLastError());
goto main_cleanup;
}
//
// Create a cleanup group for this thread pool.
//
cleanupgroup = CreateThreadpoolCleanupGroup();
if (NULL == cleanupgroup) {
_tprintf(_T("CreateThreadpoolCleanupGroup failed. LastError: %u\n"),
GetLastError());
goto main_cleanup;
}
rollback = 2; // Cleanup group creation succeeded
//
// Associate the callback environment with our thread pool.
//
SetThreadpoolCallbackPool(&CallBackEnviron, pool);
//
// Associate the cleanup group with our thread pool.
// Objects created with the same callback environment
// as the cleanup group become members of the cleanup group.
//
SetThreadpoolCallbackCleanupGroup(&CallBackEnviron,
cleanupgroup,
NULL);
//
// Create work with the callback environment.
//
work = CreateThreadpoolWork(workcallback,
NULL,
&CallBackEnviron);
if (NULL == work) {
_tprintf(_T("CreateThreadpoolWork failed. LastError: %u\n"),
GetLastError());
goto main_cleanup;
}
rollback = 3; // Creation of work succeeded
//
// Submit the work to the pool. Because this was a pre-allocated
// work item (using CreateThreadpoolWork), it is guaranteed to execute.
//
SubmitThreadpoolWork(work);
//
// Create a timer with the same callback environment.
//
timer = CreateThreadpoolTimer(timercallback,
NULL,
&CallBackEnviron);
if (NULL == timer) {
_tprintf(_T("CreateThreadpoolTimer failed. LastError: %u\n"),
GetLastError());
goto main_cleanup;
}
rollback = 4; // Timer creation succeeded
//
// Set the timer to fire in one second.
//
ulDueTime.QuadPart = (LONGLONG) -(1 * 10 * 1000 * 1000);
FileDueTime.dwHighDateTime = ulDueTime.HighPart;
FileDueTime.dwLowDateTime = ulDueTime.LowPart;
SetThreadpoolTimer(timer,
&FileDueTime,
0,
0);
//
// Delay for the timer to be fired
//
Sleep(1500);
//
// Wait for all callbacks to finish.
// CloseThreadpoolCleanupGroupMembers also releases objects
// that are members of the cleanup group, so it is not necessary
// to call close functions on individual objects
// after calling CloseThreadpoolCleanupGroupMembers.
//
CloseThreadpoolCleanupGroupMembers(cleanupgroup,
FALSE,
NULL);
//
// Already cleaned up the work item with the
// CloseThreadpoolCleanupGroupMembers, so set rollback to 2.
//
rollback = 2;
goto main_cleanup;
main_cleanup:
//
// Clean up any individual pieces manually
// Notice the fall-through structure of the switch.
// Clean up in reverse order.
//
switch (rollback) {
case 4:
case 3:
// Clean up the cleanup group members.
CloseThreadpoolCleanupGroupMembers(cleanupgroup,
FALSE, NULL);
case 2:
// Clean up the cleanup group.
CloseThreadpoolCleanupGroup(cleanupgroup);
case 1:
// Clean up the pool.
CloseThreadpool(pool);
default:
break;
}
return;
}
VOID
DemoNewRegisterWait()
{
PTP_WAIT Wait = NULL;
PTP_WAIT_CALLBACK waitcallback = MyWaitCallback;
HANDLE hEvent = NULL;
UINT i = 0;
UINT rollback = 0;
//
// Create an auto-reset event.
//
hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (NULL == hEvent) {
// Error Handling
return;
}
rollback = 1; // CreateEvent succeeded
Wait = CreateThreadpoolWait(waitcallback,
NULL,
NULL);
if(NULL == Wait) {
_tprintf(_T("CreateThreadpoolWait failed. LastError: %u\n"),
GetLastError());
goto new_wait_cleanup;
}
rollback = 2; // CreateThreadpoolWait succeeded
//
// Need to re-register the event with the wait object
// each time before signaling the event to trigger the wait callback.
//
for (i = 0; i < 5; i ++) {
SetThreadpoolWait(Wait,
hEvent,
NULL);
SetEvent(hEvent);
//
// Delay for the waiter thread to act if necessary.
//
Sleep(500);
//
// Block here until the callback function is done executing.
//
WaitForThreadpoolWaitCallbacks(Wait, FALSE);
}
new_wait_cleanup:
switch (rollback) {
case 2:
// Unregister the wait by setting the event to NULL.
SetThreadpoolWait(Wait, NULL, NULL);
// Close the wait.
CloseThreadpoolWait(Wait);
case 1:
// Close the event.
CloseHandle(hEvent);
default:
break;
}
return;
}
int _tmain(int argc, _TCHAR* argv[])
{
DemoNewRegisterWait();
DemoCleanupPersistentWorkTimer();
return 0;
}
|
