/**
 * WinPR: Windows Portable Runtime
 * Thread Pool API (Clean-up Group)
 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#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_CLEANUP_GROUP (WINAPI * pCreateThreadpoolCleanupGroup)();
static VOID (WINAPI * pCloseThreadpoolCleanupGroupMembers)(PTP_CLEANUP_GROUP ptpcg, BOOL fCancelPendingCallbacks, PVOID pvCleanupContext);
static VOID (WINAPI * pCloseThreadpoolCleanupGroup)(PTP_CLEANUP_GROUP ptpcg);

static BOOL CALLBACK init_module(PINIT_ONCE once, PVOID param, PVOID *context)
{
	HMODULE kernel32 = LoadLibraryA("kernel32.dll");
	if (kernel32)
	{
		pCreateThreadpoolCleanupGroup = (void*)GetProcAddress(kernel32, "CreateThreadpoolCleanupGroup");
		pCloseThreadpoolCleanupGroupMembers = (void*)GetProcAddress(kernel32, "CloseThreadpoolCleanupGroupMembers");
		pCloseThreadpoolCleanupGroup = (void*)GetProcAddress(kernel32, "CloseThreadpoolCleanupGroup");
	}
	return TRUE;
}
#endif

PTP_CLEANUP_GROUP winpr_CreateThreadpoolCleanupGroup()
{
	PTP_CLEANUP_GROUP cleanupGroup = NULL;
#ifdef _WIN32
	InitOnceExecuteOnce(&init_once_module, init_module, NULL, NULL);
	if (pCreateThreadpoolCleanupGroup)
		return pCreateThreadpoolCleanupGroup();
#endif
	cleanupGroup = (PTP_CLEANUP_GROUP) malloc(sizeof(TP_CLEANUP_GROUP));
	return cleanupGroup;
}

VOID winpr_CloseThreadpoolCleanupGroupMembers(PTP_CLEANUP_GROUP ptpcg, BOOL fCancelPendingCallbacks, PVOID pvCleanupContext)
{
#ifdef _WIN32
	InitOnceExecuteOnce(&init_once_module, init_module, NULL, NULL);
	if (pCloseThreadpoolCleanupGroupMembers)
	{
		pCloseThreadpoolCleanupGroupMembers(ptpcg, fCancelPendingCallbacks, pvCleanupContext);
		return;
	}
#endif
	/* No default implementation */
}

VOID winpr_CloseThreadpoolCleanupGroup(PTP_CLEANUP_GROUP ptpcg)
{
#ifdef _WIN32
	InitOnceExecuteOnce(&init_once_module, init_module, NULL, NULL);
	if (pCloseThreadpoolCleanupGroup)
	{
		pCloseThreadpoolCleanupGroup(ptpcg);
		return;
	}
#endif
	free(ptpcg);
}

#endif /* WINPR_THREAD_POOL defined */