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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.
#ifndef __SAMPLEPROFILER_H__
#define __SAMPLEPROFILER_H__
#ifdef FEATURE_PERFTRACING
#include "common.h"
#include "eventpipe.h"
enum class SampleProfilerSampleType
{
Error = 0,
External = 1,
Managed = 2
};
class SampleProfiler
{
// Declare friends.
friend class EventPipe;
friend class SampleProfilerEventInstance;
public:
// Enable profiling.
static void Enable();
// Disable profiling.
static void Disable();
// Set the sampling rate.
static void SetSamplingRate(unsigned long nanoseconds);
static unsigned long GetSamplingRate()
{
LIMITED_METHOD_CONTRACT;
return s_samplingRateInNs;
}
private:
// Iterate through all managed threads and walk all stacks.
static void WalkManagedThreads();
// Profiling thread proc. Invoked on a new thread when profiling is enabled.
static DWORD WINAPI ThreadProc(void *args);
// Calls either PAL_nanosleep or ClrSleepEx depending on platform
// Note: Although we specify the time in ns, that is no indication
// of the actually accuracy with which we will return from sleep
// In reality Unix will have a minimum granularity of ~10ms
// and Windows has a default granularity of ~16ms, but can be
// adjusted to as low as ~1ms
// Even this however is not gaurenteed. If the system is under load
// the sampling thread may be delayed up to hundreds of ms due to
// scheduling priority. There is no way to prevent this from user threads
// Additionally we may get lucky and there will be an open CPU to run
// and under light load the timings will achieve great accuracy!
static void PlatformSleep(unsigned long nanoseconds);
static bool LoadDependencies();
static void UnloadDependencies();
#ifndef FEATURE_PAL
static HINSTANCE s_hMultimediaLib;
static PVOID s_timeBeginPeriodFn;
static PVOID s_timeEndPeriodFn;
#endif //FEATURE_PAL
static void SetTimeGranularity();
static void ResetTimeGranularity();
// True when profiling is enabled.
static Volatile<BOOL> s_profilingEnabled;
// The sampling thread.
static Thread *s_pSamplingThread;
// The provider and event emitted by the profiler.
static const WCHAR* s_providerName;
static EventPipeProvider *s_pEventPipeProvider;
static EventPipeEvent *s_pThreadTimeEvent;
// Event payloads.
// External represents a sample in external or native code.
// Managed represents a sample in managed code.
static BYTE *s_pPayloadExternal;
static BYTE *s_pPayloadManaged;
static const unsigned int c_payloadSize = sizeof(unsigned int);
// Thread shutdown event for synchronization between Disable() and the sampling thread.
static CLREventStatic s_threadShutdownEvent;
// The sampling rate.
static unsigned long s_samplingRateInNs;
// Whether or not timeBeginPeriod has been used to set the scheduler period
static bool s_timePeriodIsSet;
};
#endif // FEATURE_PERFTRACING
#endif // __SAMPLEPROFILER_H__
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