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//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
//
//
#ifndef __Synch_h__
#define __Synch_h__
enum WaitMode
{
WaitMode_None =0x0,
WaitMode_Alertable = 0x1, // Can be waken by APC. May pumping message.
WaitMode_IgnoreSyncCtx = 0x2, // Dispatch to synchronization context if existed.
WaitMode_ADUnload = 0x4, // The block is to wait for AD unload start. If it is interrupted by AD Unload, we can start aborting.
WaitMode_InDeadlock = 0x8, // The wait can be terminated by host's deadlock detection
};
struct PendingSync;
class CRWLock;
class CLREventBase
{
public:
CLREventBase()
{
LIMITED_METHOD_CONTRACT;
m_handle = INVALID_HANDLE_VALUE;
m_dwFlags = 0;
}
// Create an Event that is host aware
void CreateAutoEvent(BOOL bInitialState);
void CreateManualEvent(BOOL bInitialState);
void CreateMonitorEvent(SIZE_T Cookie); // robust against initialization races - for exclusive use by AwareLock
#ifdef FEATURE_RWLOCK
void CreateRWLockReaderEvent(BOOL bInitialState, CRWLock* pRWLock);
void CreateRWLockWriterEvent(BOOL bInitialState, CRWLock* pRWLock);
#endif
// Create an Event that is not host aware
void CreateOSAutoEvent (BOOL bInitialState);
void CreateOSManualEvent (BOOL bInitialState);
void CloseEvent();
BOOL IsValid() const
{
LIMITED_METHOD_CONTRACT;
return m_handle != INVALID_HANDLE_VALUE;
}
BOOL IsMonitorEventAllocated()
{
LIMITED_METHOD_CONTRACT;
return m_dwFlags & CLREVENT_FLAGS_MONITOREVENT_ALLOCATED;
}
#ifndef DACCESS_COMPILE
HANDLE GetHandleUNHOSTED() {
LIMITED_METHOD_CONTRACT;
_ASSERTE (IsOSEvent() || !CLRSyncHosted());
return m_handle;
}
#endif // DACCESS_COMPILE
BOOL Set();
void SetMonitorEvent(); // robust against races - for exclusive use by AwareLock
BOOL Reset();
DWORD Wait(DWORD dwMilliseconds, BOOL bAlertable, PendingSync *syncState=NULL);
DWORD WaitEx(DWORD dwMilliseconds, WaitMode mode, PendingSync *syncState=NULL);
protected:
HANDLE m_handle;
private:
enum
{
CLREVENT_FLAGS_AUTO_EVENT = 0x0001,
CLREVENT_FLAGS_OS_EVENT = 0x0002,
CLREVENT_FLAGS_IN_DEADLOCK_DETECTION = 0x0004,
CLREVENT_FLAGS_MONITOREVENT_ALLOCATED = 0x0008,
CLREVENT_FLAGS_MONITOREVENT_SIGNALLED = 0x0010,
CLREVENT_FLAGS_STATIC = 0x0020,
// Several bits unused;
};
Volatile<DWORD> m_dwFlags;
BOOL IsAutoEvent() { LIMITED_METHOD_CONTRACT; return m_dwFlags & CLREVENT_FLAGS_AUTO_EVENT; }
void SetAutoEvent ()
{
LIMITED_METHOD_CONTRACT;
// cannot use `|=' operator on `Volatile<DWORD>'
m_dwFlags = m_dwFlags | CLREVENT_FLAGS_AUTO_EVENT;
}
BOOL IsOSEvent() { LIMITED_METHOD_CONTRACT; return m_dwFlags & CLREVENT_FLAGS_OS_EVENT; }
void SetOSEvent ()
{
LIMITED_METHOD_CONTRACT;
// cannot use `|=' operator on `Volatile<DWORD>'
m_dwFlags = m_dwFlags | CLREVENT_FLAGS_OS_EVENT;
}
BOOL IsInDeadlockDetection() { LIMITED_METHOD_CONTRACT; return m_dwFlags & CLREVENT_FLAGS_IN_DEADLOCK_DETECTION; }
void SetInDeadlockDetection ()
{
LIMITED_METHOD_CONTRACT;
// cannot use `|=' operator on `Volatile<DWORD>'
m_dwFlags = m_dwFlags | CLREVENT_FLAGS_IN_DEADLOCK_DETECTION;
}
};
class CLREvent : public CLREventBase
{
public:
#ifndef DACCESS_COMPILE
~CLREvent()
{
WRAPPER_NO_CONTRACT;
CloseEvent();
}
#endif
};
// CLREventStatic
// Same as CLREvent, but intended to be used for global variables.
// Instances may leak their handle, because of the order in which
// global destructors are run. Note that you can still explicitly
// call CloseHandle, which will indeed not leak the handle.
class CLREventStatic : public CLREventBase
{
};
class CLRSemaphore {
public:
CLRSemaphore()
: m_handle(INVALID_HANDLE_VALUE)
{
LIMITED_METHOD_CONTRACT;
}
~CLRSemaphore()
{
WRAPPER_NO_CONTRACT;
Close ();
}
void Create(DWORD dwInitial, DWORD dwMax);
void Close();
BOOL IsValid() const
{
LIMITED_METHOD_CONTRACT;
return m_handle != INVALID_HANDLE_VALUE;
}
DWORD Wait(DWORD dwMilliseconds, BOOL bAlertable);
BOOL Release(LONG lReleaseCount, LONG* lpPreviouseCount);
private:
HANDLE m_handle;
};
class CLRMutex {
public:
CLRMutex()
: m_handle(INVALID_HANDLE_VALUE)
{
LIMITED_METHOD_CONTRACT;
}
~CLRMutex()
{
WRAPPER_NO_CONTRACT;
Close ();
}
void Create(LPSECURITY_ATTRIBUTES lpMutexAttributes, BOOL bInitialOwner, LPCTSTR lpName);
void Close();
BOOL IsValid() const
{
LIMITED_METHOD_CONTRACT;
return m_handle != INVALID_HANDLE_VALUE;
}
DWORD Wait(DWORD dwMilliseconds, BOOL bAlertable);
BOOL Release();
private:
HANDLE m_handle;
};
BOOL CLREventWaitWithTry(CLREventBase *pEvent, DWORD timeout, BOOL fAlertable, DWORD *pStatus);
#endif
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