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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
// -----------------------------------------------------------------------------------------------------------
//
// Minimal Crst implementation based on CRITICAL_SECTION. Doesn't support much except for the basic locking
// functionality (in particular there is no rank violation checking).
//
enum CrstType
{
CrstHandleTable,
CrstDispatchCache,
CrstAllocHeap,
CrstGenericInstHashtab,
CrstMemAccessMgr,
CrstInterfaceDispatchGlobalLists,
CrstStressLog,
CrstRestrictedCallouts,
CrstGcStressControl,
CrstSuspendEE,
CrstCastCache,
};
enum CrstFlags
{
CRST_DEFAULT = 0x0,
CRST_REENTRANCY = 0x0,
CRST_UNSAFE_SAMELEVEL = 0x0,
CRST_UNSAFE_ANYMODE = 0x0,
CRST_DEBUGGER_THREAD = 0x0,
};
// Static version of Crst with no default constructor (user must call Init() before use).
class CrstStatic
{
public:
void Init(CrstType eType, CrstFlags eFlags = CRST_DEFAULT);
bool InitNoThrow(CrstType eType, CrstFlags eFlags = CRST_DEFAULT) { Init(eType, eFlags); return true; }
void Destroy();
void Enter() { CrstStatic::Enter(this); }
void Leave() { CrstStatic::Leave(this); }
static void Enter(CrstStatic *pCrst);
static void Leave(CrstStatic *pCrst);
#if defined(_DEBUG)
bool OwnedByCurrentThread();
EEThreadId GetHolderThreadId();
#endif // _DEBUG
private:
CRITICAL_SECTION m_sCritSec;
#if defined(_DEBUG)
EEThreadId m_uiOwnerId;
#endif // _DEBUG
};
// Non-static version that will initialize itself during construction.
class Crst : public CrstStatic
{
public:
Crst(CrstType eType, CrstFlags eFlags = CRST_DEFAULT)
: CrstStatic()
{ Init(eType, eFlags); }
};
// Holder for a Crst instance.
class CrstHolder
{
CrstStatic * m_pLock;
public:
CrstHolder(CrstStatic * pLock)
: m_pLock(pLock)
{
m_pLock->Enter();
}
~CrstHolder()
{
m_pLock->Leave();
}
};
class CrstHolderWithState
{
CrstStatic * m_pLock;
bool m_fAcquired;
public:
CrstHolderWithState(CrstStatic * pLock, bool fAcquire = true)
: m_pLock(pLock), m_fAcquired(fAcquire)
{
if (fAcquire)
m_pLock->Enter();
}
~CrstHolderWithState()
{
if (m_fAcquired)
m_pLock->Leave();
}
void Acquire()
{
if (!m_fAcquired)
{
m_pLock->Enter();
m_fAcquired = true;
}
}
void Release()
{
if (m_fAcquired)
{
m_pLock->Leave();
m_fAcquired = false;
}
}
CrstStatic * GetValue()
{
return m_pLock;
}
};
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