Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/winpr/libwinpr/synch/init.c

@@ -0,0 +1,99 @@
+/**
+ * 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.
+ */
+
+#include <winpr/config.h>
+
+#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(WINPR_ATTR_UNUSED LPINIT_ONCE lpInitOnce,
+                                   WINPR_ATTR_UNUSED DWORD dwFlags,
+                                   WINPR_ATTR_UNUSED PBOOL fPending,
+                                   WINPR_ATTR_UNUSED LPVOID* lpContext)
+{
+	WLog_ERR(TAG, "not implemented");
+	return FALSE;
+}
+
+BOOL winpr_InitOnceComplete(WINPR_ATTR_UNUSED LPINIT_ONCE lpInitOnce,
+                            WINPR_ATTR_UNUSED DWORD dwFlags, WINPR_ATTR_UNUSED LPVOID lpContext)
+{
+	WLog_ERR(TAG, "not implemented");
+	return FALSE;
+}
+
+VOID winpr_InitOnceInitialize(WINPR_ATTR_UNUSED 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