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120 lines
3.1 KiB
120 lines
3.1 KiB
/*
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* Copyright 2002-2019 Intel Corporation.
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*
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* This software is provided to you as Sample Source Code as defined in the accompanying
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* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
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* section 1.L.
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*
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* This software and the related documents are provided as is, with no express or implied
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* warranties, other than those that are expressly stated in the License.
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*/
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/*
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* This tool is designed to run with the "rt-locks-app.cpp" application. See
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* that source file for a description.
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*/
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#include <iostream>
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#include <cstdlib>
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#include "pin.H"
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#include <sched.h>
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static void InstrumentIns(INS, VOID *);
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static void InstrumentRtn(RTN, VOID *);
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static void OnExit(INT32, VOID *);
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static void UseLocksWorker();
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static void UseLocksScheduler();
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static void CannotRunTest();
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static BOOL FoundDoWork = FALSE;
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static BOOL FoundDoGetLock = FALSE;
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static BOOL TestNotRun = FALSE;
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static PIN_LOCK Lock;
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static unsigned long UseLockWorkerCount = 0;
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static unsigned long UseLockSchedulerCount = 0;
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int main(int argc, char * argv[])
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{
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PIN_Init(argc, argv);
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PIN_InitSymbols();
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PIN_InitLock(&Lock);
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INS_AddInstrumentFunction(InstrumentIns, 0);
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RTN_AddInstrumentFunction(InstrumentRtn, 0);
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PIN_AddFiniFunction(OnExit, 0);
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PIN_StartProgram();
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return 0;
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}
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static void InstrumentIns(INS ins, VOID *)
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{
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RTN rtn = INS_Rtn(ins);
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if (RTN_Valid(rtn) && RTN_Name(rtn) == "DoWorkInstrumentedWithPin")
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{
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FoundDoWork = true;
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INS_InsertCall(ins, IPOINT_BEFORE, AFUNPTR(UseLocksWorker), IARG_END);
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}
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}
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static void InstrumentRtn(RTN rtn, VOID *)
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{
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if (RTN_Name(rtn) == "DoGetLockWithPin")
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{
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FoundDoGetLock = true;
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RTN_Open(rtn);
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RTN_InsertCall(rtn, IPOINT_BEFORE, AFUNPTR(UseLocksScheduler), IARG_END);
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RTN_Close(rtn);
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}
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if (RTN_Name(rtn) == "TellPinNotSupported")
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{
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RTN_Open(rtn);
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RTN_InsertCall(rtn, IPOINT_BEFORE, AFUNPTR(CannotRunTest), IARG_END);
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RTN_Close(rtn);
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}
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}
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static void OnExit(INT32, VOID *)
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{
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if (!TestNotRun && (!FoundDoWork || !FoundDoGetLock))
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{
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std::cout << "Couldn't find instrumentation routine(s)" << std::endl;
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exit(1);
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}
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std::cout << "Worker count for UseLocks : " << std::dec << UseLockWorkerCount << std::endl;
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std::cout << "Scheduler count for UseLocks: " << std::dec << UseLockSchedulerCount << std::endl;
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}
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static void UseLocksWorker()
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{
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UseLockWorkerCount++;
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// The worker thread executes this in a loop. We do sched_yield() to
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// encourage the kernel to switch the thread off the CPU while it holds
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// the lock. This would be possible even without the sched_yield(), though.
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//
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PIN_GetLock(&Lock, 1);
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sched_yield();
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PIN_ReleaseLock(&Lock);
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}
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static void UseLocksScheduler()
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{
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UseLockSchedulerCount++;
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// The scheduler thread executes this after it has lowered the priority of
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// the worker thread. The hope is that we will try to acquire the lock while
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// the worker already has it.
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//
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PIN_GetLock(&Lock, 2);
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PIN_ReleaseLock(&Lock);
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}
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static void CannotRunTest()
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{
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TestNotRun = TRUE;
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}
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