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/**
* WinPR: Windows Portable Runtime
* Synchronization Functions
*
* Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
* Copyright 2014 Thincast Technologies GmbH
* Copyright 2014 Norbert Federa <norbert.federa@thincast.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/synch.h>
#include <winpr/interlocked.h>
#include "../log.h"
#define TAG WINPR_TAG("sync")
#if (!defined(_WIN32)) || (defined(_WIN32) && (_WIN32_WINNT < 0x0600))
BOOL winpr_InitOnceBeginInitialize(LPINIT_ONCE lpInitOnce, DWORD dwFlags, PBOOL fPending, LPVOID* lpContext)
{
WLog_ERR(TAG, "not implemented");
return FALSE;
}
BOOL winpr_InitOnceComplete(LPINIT_ONCE lpInitOnce, DWORD dwFlags, LPVOID lpContext)
{
WLog_ERR(TAG, "not implemented");
return FALSE;
}
VOID winpr_InitOnceInitialize(PINIT_ONCE InitOnce)
{
WLog_ERR(TAG, "not implemented");
}
BOOL winpr_InitOnceExecuteOnce(PINIT_ONCE InitOnce, PINIT_ONCE_FN InitFn, PVOID Parameter, LPVOID* Context)
{
for (;;)
{
switch ((ULONG_PTR)InitOnce->Ptr & 3)
{
case 2:
/* already completed successfully */
return TRUE;
case 0:
/* first time */
if (InterlockedCompareExchangePointer(&InitOnce->Ptr, (PVOID)1, (PVOID)0) != (PVOID)0)
{
/* some other thread was faster */
break;
}
/* it's our job to call the init function */
if (InitFn(InitOnce, Parameter, Context))
{
/* success */
InitOnce->Ptr = (PVOID)2;
return TRUE;
}
/* the init function returned an error, reset the status */
InitOnce->Ptr = (PVOID)0;
return FALSE;
case 1:
/* in progress */
break;
default:
WLog_ERR(TAG, "internal error");
return FALSE;
}
Sleep(5);
}
}
#endif
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