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/**
* WinPR: Windows Portable Runtime
* Thread Pool API (Pool)
*
* Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <winpr/config.h>
#include <winpr/crt.h>
#include <winpr/pool.h>
#include <winpr/library.h>
#include "pool.h"
#ifdef WINPR_THREAD_POOL
#ifdef _WIN32
static INIT_ONCE init_once_module = INIT_ONCE_STATIC_INIT;
static PTP_POOL(WINAPI* pCreateThreadpool)(PVOID reserved);
static VOID(WINAPI* pCloseThreadpool)(PTP_POOL ptpp);
static BOOL(WINAPI* pSetThreadpoolThreadMinimum)(PTP_POOL ptpp, DWORD cthrdMic);
static VOID(WINAPI* pSetThreadpoolThreadMaximum)(PTP_POOL ptpp, DWORD cthrdMost);
static BOOL CALLBACK init_module(PINIT_ONCE once, PVOID param, PVOID* context)
{
HMODULE kernel32 = LoadLibraryA("kernel32.dll");
if (kernel32)
{
pCreateThreadpool = (void*)GetProcAddress(kernel32, "CreateThreadpool");
pCloseThreadpool = (void*)GetProcAddress(kernel32, "CloseThreadpool");
pSetThreadpoolThreadMinimum = (void*)GetProcAddress(kernel32, "SetThreadpoolThreadMinimum");
pSetThreadpoolThreadMaximum = (void*)GetProcAddress(kernel32, "SetThreadpoolThreadMaximum");
}
return TRUE;
}
#endif
static TP_POOL DEFAULT_POOL = {
0, /* DWORD Minimum */
500, /* DWORD Maximum */
NULL, /* wArrayList* Threads */
NULL, /* wQueue* PendingQueue */
NULL, /* HANDLE TerminateEvent */
NULL, /* wCountdownEvent* WorkComplete */
};
static DWORD WINAPI thread_pool_work_func(LPVOID arg)
{
DWORD status = 0;
PTP_POOL pool = NULL;
PTP_WORK work = NULL;
HANDLE events[2];
PTP_CALLBACK_INSTANCE callbackInstance = NULL;
pool = (PTP_POOL)arg;
events[0] = pool->TerminateEvent;
events[1] = Queue_Event(pool->PendingQueue);
while (1)
{
status = WaitForMultipleObjects(2, events, FALSE, INFINITE);
if (status == WAIT_OBJECT_0)
break;
if (status != (WAIT_OBJECT_0 + 1))
break;
callbackInstance = (PTP_CALLBACK_INSTANCE)Queue_Dequeue(pool->PendingQueue);
if (callbackInstance)
{
work = callbackInstance->Work;
work->WorkCallback(callbackInstance, work->CallbackParameter, work);
CountdownEvent_Signal(pool->WorkComplete, 1);
free(callbackInstance);
}
}
ExitThread(0);
return 0;
}
static void threads_close(void* thread)
{
WaitForSingleObject(thread, INFINITE);
CloseHandle(thread);
}
static BOOL InitializeThreadpool(PTP_POOL pool)
{
BOOL rc = FALSE;
wObject* obj = NULL;
HANDLE thread = NULL;
if (pool->Threads)
return TRUE;
pool->Minimum = 0;
pool->Maximum = 500;
if (!(pool->PendingQueue = Queue_New(TRUE, -1, -1)))
goto fail;
if (!(pool->WorkComplete = CountdownEvent_New(0)))
goto fail;
if (!(pool->TerminateEvent = CreateEvent(NULL, TRUE, FALSE, NULL)))
goto fail;
if (!(pool->Threads = ArrayList_New(TRUE)))
goto fail;
obj = ArrayList_Object(pool->Threads);
obj->fnObjectFree = threads_close;
for (int index = 0; index < 4; index++)
{
if (!(thread = CreateThread(NULL, 0, thread_pool_work_func, (void*)pool, 0, NULL)))
{
goto fail;
}
if (!ArrayList_Append(pool->Threads, thread))
{
CloseHandle(thread);
goto fail;
}
}
rc = TRUE;
fail:
return rc;
}
PTP_POOL GetDefaultThreadpool(void)
{
PTP_POOL pool = NULL;
pool = &DEFAULT_POOL;
if (!InitializeThreadpool(pool))
return NULL;
return pool;
}
PTP_POOL winpr_CreateThreadpool(PVOID reserved)
{
PTP_POOL pool = NULL;
#ifdef _WIN32
InitOnceExecuteOnce(&init_once_module, init_module, NULL, NULL);
if (pCreateThreadpool)
return pCreateThreadpool(reserved);
#else
WINPR_UNUSED(reserved);
#endif
if (!(pool = (PTP_POOL)calloc(1, sizeof(TP_POOL))))
return NULL;
if (!InitializeThreadpool(pool))
{
winpr_CloseThreadpool(pool);
return NULL;
}
return pool;
}
VOID winpr_CloseThreadpool(PTP_POOL ptpp)
{
#ifdef _WIN32
InitOnceExecuteOnce(&init_once_module, init_module, NULL, NULL);
if (pCloseThreadpool)
{
pCloseThreadpool(ptpp);
return;
}
#endif
SetEvent(ptpp->TerminateEvent);
ArrayList_Free(ptpp->Threads);
Queue_Free(ptpp->PendingQueue);
CountdownEvent_Free(ptpp->WorkComplete);
CloseHandle(ptpp->TerminateEvent);
{
TP_POOL empty = { 0 };
*ptpp = empty;
}
if (ptpp != &DEFAULT_POOL)
free(ptpp);
}
BOOL winpr_SetThreadpoolThreadMinimum(PTP_POOL ptpp, DWORD cthrdMic)
{
HANDLE thread = NULL;
#ifdef _WIN32
InitOnceExecuteOnce(&init_once_module, init_module, NULL, NULL);
if (pSetThreadpoolThreadMinimum)
return pSetThreadpoolThreadMinimum(ptpp, cthrdMic);
#endif
ptpp->Minimum = cthrdMic;
while (ArrayList_Count(ptpp->Threads) < ptpp->Minimum)
{
if (!(thread = CreateThread(NULL, 0, thread_pool_work_func, (void*)ptpp, 0, NULL)))
{
return FALSE;
}
if (!ArrayList_Append(ptpp->Threads, thread))
{
CloseHandle(thread);
return FALSE;
}
}
return TRUE;
}
VOID winpr_SetThreadpoolThreadMaximum(PTP_POOL ptpp, DWORD cthrdMost)
{
#ifdef _WIN32
InitOnceExecuteOnce(&init_once_module, init_module, NULL, NULL);
if (pSetThreadpoolThreadMaximum)
{
pSetThreadpoolThreadMaximum(ptpp, cthrdMost);
return;
}
#endif
ptpp->Maximum = cthrdMost;
}
#endif /* WINPR_THREAD_POOL defined */
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