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62 lines
1.9 KiB
62 lines
1.9 KiB
4 months ago
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//===-- esan_sideline.h -----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of EfficiencySanitizer, a family of performance tuners.
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//
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// Esan sideline thread support.
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//===----------------------------------------------------------------------===//
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#ifndef ESAN_SIDELINE_H
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#define ESAN_SIDELINE_H
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#include "sanitizer_common/sanitizer_atomic.h"
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#include "sanitizer_common/sanitizer_internal_defs.h"
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namespace __esan {
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typedef void (*SidelineFunc)(void *Arg);
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// Currently only one sideline thread is supported.
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// It calls the SidelineFunc passed to launchThread once on each sample at the
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// given frequency in real time (i.e., wall clock time).
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class SidelineThread {
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public:
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// We cannot initialize any fields in the constructor as it will be called
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// *after* launchThread for a static instance, as esan.module_ctor is called
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// before static initializers.
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SidelineThread() {}
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~SidelineThread() {}
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// To simplify declaration in sanitizer code where we want to avoid
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// heap allocations, the constructor and destructor do nothing and
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// launchThread and joinThread do the real work.
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// They should each be called just once.
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bool launchThread(SidelineFunc takeSample, void *Arg, u32 FreqMilliSec);
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bool joinThread();
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// Must be called from the sideline thread itself.
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bool adjustTimer(u32 FreqMilliSec);
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private:
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static int runSideline(void *Arg);
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static void registerSignal(int SigNum);
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static void handleSidelineSignal(int SigNum, void *SigInfo, void *Ctx);
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char *Stack;
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SidelineFunc sampleFunc;
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void *FuncArg;
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u32 Freq;
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uptr SidelineId;
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atomic_uintptr_t SidelineExit;
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};
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} // namespace __esan
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#endif // ESAN_SIDELINE_H
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