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utils/vmpi/threadhelpers.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include <windows.h>
+#include "threadhelpers.h"
+#include "tier0/dbg.h"
+
+
+// -------------------------------------------------------------------------------- //
+// CCriticalSection implementation.
+// -------------------------------------------------------------------------------- //
+
+CCriticalSection::CCriticalSection()
+{
+	Assert( sizeof( CRITICAL_SECTION ) == SIZEOF_CS );
+
+#if defined( _DEBUG )
+	InitializeCriticalSection( (CRITICAL_SECTION*)&m_DeadlockProtect );
+#endif
+
+	InitializeCriticalSection( (CRITICAL_SECTION*)&m_CS );
+}
+
+
+CCriticalSection::~CCriticalSection()
+{
+	DeleteCriticalSection( (CRITICAL_SECTION*)&m_CS );
+
+#if defined( _DEBUG )
+	DeleteCriticalSection( (CRITICAL_SECTION*)&m_DeadlockProtect );
+#endif
+}
+
+
+
+void CCriticalSection::Lock()
+{
+#if defined( _DEBUG )
+	// Check if this one is already locked.
+	DWORD id = GetCurrentThreadId();
+	EnterCriticalSection( (CRITICAL_SECTION*)&m_DeadlockProtect );
+		Assert( m_Locks.Find( id ) == m_Locks.InvalidIndex() );
+		m_Locks.AddToTail( id );
+	LeaveCriticalSection( (CRITICAL_SECTION*)&m_DeadlockProtect );
+#endif
+
+	EnterCriticalSection( (CRITICAL_SECTION*)&m_CS );
+}
+
+
+void CCriticalSection::Unlock()
+{
+#if defined( _DEBUG )
+	// Check if this one is already locked.
+	DWORD id = GetCurrentThreadId();
+	EnterCriticalSection( (CRITICAL_SECTION*)&m_DeadlockProtect );
+		int index = m_Locks.Find( id );
+		Assert( index != m_Locks.InvalidIndex() );
+		m_Locks.Remove( index );
+	LeaveCriticalSection( (CRITICAL_SECTION*)&m_DeadlockProtect );
+#endif
+	
+	LeaveCriticalSection( (CRITICAL_SECTION*)&m_CS );
+}
+
+
+
+// -------------------------------------------------------------------------------- //
+// CCriticalSectionLock implementation.
+// -------------------------------------------------------------------------------- //
+
+CCriticalSectionLock::CCriticalSectionLock( CCriticalSection *pCS )
+{
+	m_pCS = pCS;
+	m_bLocked = false;
+}
+
+
+CCriticalSectionLock::~CCriticalSectionLock()
+{
+	if ( m_bLocked )
+		m_pCS->Unlock();
+}
+
+
+void CCriticalSectionLock::Lock()
+{
+	Assert( !m_bLocked );
+	m_bLocked = true;
+	m_pCS->Lock();
+}
+
+
+void CCriticalSectionLock::Unlock()
+{
+	Assert( m_bLocked );
+	m_bLocked = false;
+	m_pCS->Unlock();
+}
+
+
+// -------------------------------------------------------------------------------- //
+// CEvent implementation.
+// -------------------------------------------------------------------------------- //
+
+CEvent::CEvent()
+{
+	m_hEvent = NULL;
+}
+
+CEvent::~CEvent()
+{
+	Term();
+}
+
+bool CEvent::Init( bool bManualReset, bool bInitialState )
+{
+	Term();
+
+	m_hEvent = (void*)CreateEvent( NULL, bManualReset, bInitialState, NULL );
+	return (m_hEvent != NULL);
+}
+
+void CEvent::Term()
+{
+	if ( m_hEvent )
+	{
+		CloseHandle( (HANDLE)m_hEvent );
+		m_hEvent = NULL;
+	}
+}
+
+void* CEvent::GetEventHandle() const
+{
+	Assert( m_hEvent );
+	return m_hEvent;
+}
+
+bool CEvent::SetEvent()
+{
+	Assert( m_hEvent );
+	return ::SetEvent( (HANDLE)m_hEvent ) != 0;
+}
+
+bool CEvent::ResetEvent()
+{
+	Assert( m_hEvent );
+	return ::ResetEvent( (HANDLE)m_hEvent ) != 0;
+}
+
+