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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.
//
// ---------------------------------------------------------------------------
// APIThreadStress.cpp (API thread stresser)
// ---------------------------------------------------------------------------
#include "stdafx.h"
#ifdef _DEBUG
#define LOGGING 1
#endif
#include "apithreadstress.h"
#include "clrhost.h"
#include "ex.h"
#include "log.h"
// For now, thread stress is incompatible with hosting. We need a host CreateThread
// to fix this.
#undef SetEvent
#undef ResetEvent
int APIThreadStress::s_threadStressCount = 0;
APIThreadStress::APIThreadStress()
{
m_threadCount = 0;
// Don't "fork" stress threads
if (ClrFlsGetValue(TlsIdx_StressThread) == NULL)
m_threadCount = s_threadStressCount;
if (m_threadCount != 0)
{
m_setupOK = TRUE;
m_hThreadArray = new (nothrow) HANDLE [ m_threadCount ];
if (m_hThreadArray == NULL)
m_setupOK = FALSE;
else
{
HANDLE *p = m_hThreadArray;
HANDLE *pEnd = p + m_threadCount;
while (p < pEnd)
{
DWORD id;
*p = ::CreateThread(NULL, 0, StartThread, this, 0, &id);
if (*p == NULL)
m_setupOK = FALSE;
p++;
}
}
m_syncEvent = ClrCreateManualEvent(FALSE);
if (m_syncEvent == INVALID_HANDLE_VALUE)
m_setupOK = FALSE;
}
}
APIThreadStress::~APIThreadStress()
{
if (m_threadCount > 0)
{
HANDLE *p = m_hThreadArray;
HANDLE *pEnd = p + m_threadCount;
if (p != NULL)
{
while (p < pEnd)
{
if (*p != NULL)
{
if (m_threadCount > 0 && m_setupOK)
WaitForSingleObjectEx(*p, INFINITE, FALSE);
::CloseHandle(*p);
}
p++;
}
delete [] m_hThreadArray;
}
if (m_syncEvent != INVALID_HANDLE_VALUE)
CloseHandle(m_syncEvent);
}
}
void APIThreadStress::SetThreadStressCount(int threadCount)
{
s_threadStressCount = threadCount;
}
DWORD WINAPI APIThreadStress::StartThread(void *arg)
{
APIThreadStress *pThis = (APIThreadStress *) arg;
ClrFlsSetValue(TlsIdx_StressThread, pThis);
EX_TRY
{
// Perform initial synchronization
WaitForSingleObjectEx(pThis->m_syncEvent, INFINITE, FALSE);
InterlockedIncrement(&pThis->m_runCount);
LOG((LF_SYNC, LL_INFO100, "Stressing operation on thread %d\n", GetCurrentThreadId()));
((APIThreadStress *)arg)->Invoke();
LOG((LF_SYNC, LL_INFO100, "End stress operation on thread %d\n", GetCurrentThreadId()));
if (InterlockedDecrement(&pThis->m_runCount) == 0)
::SetEvent(pThis->m_syncEvent);
}
EX_CATCH
{
LOG((LF_SYNC, LL_ERROR, "Exception during stress operation on thread %d\n", GetCurrentThreadId()));
}
EX_END_CATCH(SwallowAllExceptions);
return 0;
}
BOOL APIThreadStress::DoThreadStress()
{
if (m_threadCount > 0 && m_setupOK)
{
HANDLE *p = m_hThreadArray;
HANDLE *pEnd = p + m_threadCount;
while (p < pEnd)
{
::ResumeThread(*p);
p++;
}
// Start the threads at the same time
::SetEvent(m_syncEvent);
return TRUE;
}
else
{
SyncThreadStress();
return FALSE;
}
}
void APIThreadStress::SyncThreadStress()
{
APIThreadStress *pThis = (APIThreadStress *) ClrFlsGetValue(TlsIdx_StressThread);
if (pThis != NULL)
{
LOG((LF_SYNC, LL_INFO1000, "Syncing stress operation on thread %d\n", GetCurrentThreadId()));
::ResetEvent(pThis->m_syncEvent);
if (InterlockedDecrement(&pThis->m_runCount) == 0)
::SetEvent(pThis->m_syncEvent);
else
WaitForSingleObjectEx(pThis->m_syncEvent, INFINITE, FALSE);
InterlockedIncrement(&pThis->m_runCount);
LOG((LF_SYNC, LL_INFO1000, "Resuming stress operation on thread %d\n", GetCurrentThreadId()));
}
}
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