/** * WinPR: Windows Portable Runtime * Synchronization Functions * * Copyright 2012 Marc-Andre Moreau * Copyright 2014 Thincast Technologies GmbH * Copyright 2014 Norbert Federa * * 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 #include #include "../log.h" #define TAG WINPR_TAG("sync") #if (!defined(_WIN32)) || (defined(_WIN32) && (_WIN32_WINNT < 0x0600)) BOOL InitOnceBeginInitialize(LPINIT_ONCE lpInitOnce, DWORD dwFlags, PBOOL fPending, LPVOID* lpContext) { WLog_ERR(TAG, "not implemented"); return FALSE; } BOOL InitOnceComplete(LPINIT_ONCE lpInitOnce, DWORD dwFlags, LPVOID lpContext) { WLog_ERR(TAG, "not implemented"); return FALSE; } VOID InitOnceInitialize(PINIT_ONCE InitOnce) { WLog_ERR(TAG, "not implemented"); } BOOL 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