1 files changed, 148 insertions, 0 deletions

diff --git a/private/unimodem/new/mic/sync.h b/private/unimodem/new/mic/sync.h
new file mode 100644
index 000000000..95f9bbe48
--- /dev/null
+++ b/private/unimodem/new/mic/sync.h
@@ -0,0 +1,148 @@
+//
+//		Copyright (c) 1996 Microsoft Corporation
+//
+//
+//		SYNC.H		-- Header for Classes:
+//							CSync
+//
+//		History:
+//			05/21/96	JosephJ		Created
+//
+//
+#ifndef _SYNC_H_
+#define _SYNC_H_
+
+
+///////////////////////////////////////////////////////////////////////////
+//		CLASS CSync
+///////////////////////////////////////////////////////////////////////////
+
+//	Controls access to its parent object. Includes a critical section, and
+//	(TODO) mechanism for waiting until all threads have finished using
+//	the parent object.
+
+// Sample session (pObj is a ptr to a hypothetical parent, which implements
+// methods Load, Unload, OpenSession, CloseSession using the member CSymc
+// object):
+// pObj->Load("mdmusr.inf");
+// hSession = pObj->OpenSession();
+// ... do stuff ...
+// pObj->CloseSession(hSession);
+// hSync = pObj->Unload();
+// if (hSync) WaitForSingleObject(hSync, INFINITE);
+// CloseHandle(hSync);
+
+class CSync
+{
+
+public:
+
+	CSync(void) {InitializeCriticalSection(&m_crit);}
+
+	~CSync()
+	{
+		EnterCriticalSection(&m_crit);
+		DeleteCriticalSection(&m_crit);
+	}
+
+	//--------------	EnterCrit		------------------
+	// Claim our critical section
+	void EnterCrit(void) const
+	{
+		EnterCriticalSection((CRITICAL_SECTION *)&m_crit);
+	}
+
+	//--------------	LeaveCrit		------------------
+	// Release our critical section
+	void LeaveCrit(void) const
+	{
+		LeaveCriticalSection((CRITICAL_SECTION *)&m_crit);
+	}
+
+#if (TODO)
+
+	BOOL 	BeginLoad(void)
+			{
+			}
+
+	void 	EndLoad(void)
+			{
+				EnterCrit();
+				ASSERT (m_eState == CSYNC_LOADING);
+				m_eState = CSYNC_LOADED;
+				LeaveCrit();
+			}
+
+	HANDLE	BeginUnload(void)
+			{
+				HANDLE h=NULL;
+				EnterCrit();
+				if (m_eState == CSYNC_LOADED)
+				{
+					m_eState = CSYNC_UNLOADING;
+				}
+				else
+				{
+					fRet = FALSE;
+				}
+				LeaveCrit();
+
+				return fRet;
+			}
+
+	void	EndUnload(void);	
+
+	HSESSION	BeginSession(void)
+				{
+					HSESSION hRet = 1;
+					EnterCrit();
+					if (m_eState==SYNC_LOADED)
+					{
+						m_uRefCount++;
+					}
+					else
+					{
+						hRet = 0;
+					}
+					LeaveCrit();
+
+					return hRet;
+				}
+	
+	void	EndSession(HSESSION hSession)
+				{
+					SLINST *pEventList=NULL;
+					EnterCrit();
+					ASSERT(hSession==1 && m_uRefCount);
+					m_uRefCount--;
+					if (m_eState==SYNC_UNLOADING && m_pEventList)
+					{
+						pEventList = m_pEventList;
+						m_pEventList=NULL;
+					}
+					LeaveCrit();
+
+					mfn_SignalAndFree(m_pEventList);
+				}
+
+	BOOL	AddContext(HSESSION hS)
+				{
+					return FALSE;
+				}
+#endif // TODO
+
+private:
+
+	CRITICAL_SECTION		m_crit;
+
+#if (TODO)
+	UINT					m_uRefCount;
+	enum {CSYNC_UNLOADED, CSYNC_LOADING, CSYNC_UNLOADING, CSYNC_UNLOADED}
+							m_eState;
+	SLIST* pUnloadEventList;
+#endif // TODO
+
+};
+
+
+#endif // _SYNC_H_