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| 1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
| 4 // met: | 4 // met: |
| 5 // | 5 // |
| 6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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| 726 } | 726 } |
| 727 | 727 |
| 728 static void RestoreSignalHandler() { | 728 static void RestoreSignalHandler() { |
| 729 if (signal_handler_installed_) { | 729 if (signal_handler_installed_) { |
| 730 sigaction(SIGPROF, &old_signal_handler_, 0); | 730 sigaction(SIGPROF, &old_signal_handler_, 0); |
| 731 signal_handler_installed_ = false; | 731 signal_handler_installed_ = false; |
| 732 } | 732 } |
| 733 } | 733 } |
| 734 | 734 |
| 735 static void AddActiveSampler(Sampler* sampler) { | 735 static void AddActiveSampler(Sampler* sampler) { |
| 736 ScopedLock lock(mutex_); | 736 ScopedLock lock(mutex_.Pointer()); |
| 737 SamplerRegistry::AddActiveSampler(sampler); | 737 SamplerRegistry::AddActiveSampler(sampler); |
| 738 if (instance_ == NULL) { | 738 if (instance_ == NULL) { |
| 739 // Start a thread that will send SIGPROF signal to VM threads, | 739 // Start a thread that will send SIGPROF signal to VM threads, |
| 740 // when CPU profiling will be enabled. | 740 // when CPU profiling will be enabled. |
| 741 instance_ = new SignalSender(sampler->interval()); | 741 instance_ = new SignalSender(sampler->interval()); |
| 742 instance_->Start(); | 742 instance_->Start(); |
| 743 } else { | 743 } else { |
| 744 ASSERT(instance_->interval_ == sampler->interval()); | 744 ASSERT(instance_->interval_ == sampler->interval()); |
| 745 } | 745 } |
| 746 } | 746 } |
| 747 | 747 |
| 748 static void RemoveActiveSampler(Sampler* sampler) { | 748 static void RemoveActiveSampler(Sampler* sampler) { |
| 749 ScopedLock lock(mutex_); | 749 ScopedLock lock(mutex_.Pointer()); |
| 750 SamplerRegistry::RemoveActiveSampler(sampler); | 750 SamplerRegistry::RemoveActiveSampler(sampler); |
| 751 if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) { | 751 if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) { |
| 752 RuntimeProfiler::StopRuntimeProfilerThreadBeforeShutdown(instance_); | 752 RuntimeProfiler::StopRuntimeProfilerThreadBeforeShutdown(instance_); |
| 753 delete instance_; | 753 delete instance_; |
| 754 instance_ = NULL; | 754 instance_ = NULL; |
| 755 RestoreSignalHandler(); | 755 RestoreSignalHandler(); |
| 756 } | 756 } |
| 757 } | 757 } |
| 758 | 758 |
| 759 // Implement Thread::Run(). | 759 // Implement Thread::Run(). |
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| 833 ASSERT(result == 0 || errno == EINTR); | 833 ASSERT(result == 0 || errno == EINTR); |
| 834 } | 834 } |
| 835 #endif | 835 #endif |
| 836 USE(result); | 836 USE(result); |
| 837 } | 837 } |
| 838 | 838 |
| 839 const int interval_; | 839 const int interval_; |
| 840 RuntimeProfilerRateLimiter rate_limiter_; | 840 RuntimeProfilerRateLimiter rate_limiter_; |
| 841 | 841 |
| 842 // Protects the process wide state below. | 842 // Protects the process wide state below. |
| 843 static Mutex* mutex_; | 843 static LazyMutex mutex_; |
| 844 static SignalSender* instance_; | 844 static SignalSender* instance_; |
| 845 static bool signal_handler_installed_; | 845 static bool signal_handler_installed_; |
| 846 static struct sigaction old_signal_handler_; | 846 static struct sigaction old_signal_handler_; |
| 847 | 847 |
| 848 private: | 848 private: |
| 849 DISALLOW_COPY_AND_ASSIGN(SignalSender); | 849 DISALLOW_COPY_AND_ASSIGN(SignalSender); |
| 850 }; | 850 }; |
| 851 | 851 |
| 852 Mutex* SignalSender::mutex_ = OS::CreateMutex(); | 852 LazyMutex SignalSender::mutex_ = LAZY_MUTEX_INITIALIZER; |
| 853 SignalSender* SignalSender::instance_ = NULL; | 853 SignalSender* SignalSender::instance_ = NULL; |
| 854 struct sigaction SignalSender::old_signal_handler_; | 854 struct sigaction SignalSender::old_signal_handler_; |
| 855 bool SignalSender::signal_handler_installed_ = false; | 855 bool SignalSender::signal_handler_installed_ = false; |
| 856 | 856 |
| 857 | 857 |
| 858 Sampler::Sampler(Isolate* isolate, int interval) | 858 Sampler::Sampler(Isolate* isolate, int interval) |
| 859 : isolate_(isolate), | 859 : isolate_(isolate), |
| 860 interval_(interval), | 860 interval_(interval), |
| 861 profiling_(false), | 861 profiling_(false), |
| 862 active_(false), | 862 active_(false), |
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| 878 } | 878 } |
| 879 | 879 |
| 880 | 880 |
| 881 void Sampler::Stop() { | 881 void Sampler::Stop() { |
| 882 ASSERT(IsActive()); | 882 ASSERT(IsActive()); |
| 883 SignalSender::RemoveActiveSampler(this); | 883 SignalSender::RemoveActiveSampler(this); |
| 884 SetActive(false); | 884 SetActive(false); |
| 885 } | 885 } |
| 886 | 886 |
| 887 } } // namespace v8::internal | 887 } } // namespace v8::internal |
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