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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.h (API thread stresser)
// ---------------------------------------------------------------------------
// ---------------------------------------------------------------------------
// This class provides a simple base to wrap "thread stress" logic around an API,
// which will (in thread stress mode) cause an API to "fork" onto many threads
// executing the same operation simulatenously. This can help to expose race
// conditions.
//
// Usage:
//
// First, subtype APIThreadStress and override Invoke to implement the operation.
// You will likely need to add data members for the arguments.
//
// Next, inside the API, write code like this:
//
// void MyRoutine(int a1, void *a2)
// {
// class stress : APIThreadStress
// {
// int a1;
// void *a2;
// stress(int a1, void *a2) : a1(a1), a2(a2)
// { DoThreadStress(); }
// void Invoke() { MyRoutine(a1, a2); }
// } ts (a1, a2);
//
// // implementation
//
// // perhaps we have a common sub-point in the routine where we want the threads to
// // queue up and race again
//
// ts.SyncThreadStress();
//
// // more implementation
// }
// ---------------------------------------------------------------------------
#ifndef _APITHREADSTRESS_H_
#define _APITHREADSTRESS_H_
#include "utilcode.h"
#ifdef STRESS_THREAD
class APIThreadStress
{
public:
APIThreadStress();
~APIThreadStress();
BOOL DoThreadStress();
static void SyncThreadStress();
static void SetThreadStressCount(int count);
protected:
virtual void Invoke() {LIMITED_METHOD_CONTRACT;};
private:
static DWORD WINAPI StartThread(void *arg);
static int s_threadStressCount;
int m_threadCount;
HANDLE *m_hThreadArray;
BOOL m_setupOK;
LONG m_runCount;
HANDLE m_syncEvent;
};
#else // STRESS_THREAD
class APIThreadStress
{
public:
BOOL DoThreadStress() { return FALSE; }
static void SyncThreadStress() { }
static void SetThreadStressCount(int count) { }
};
#endif // STRESS_THREAD
#endif // _APITHREADSTRESS_H_
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