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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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| 839 SamplerRegistry::State state; | 839 SamplerRegistry::State state; |
| 840 while ((state = SamplerRegistry::GetState()) != | 840 while ((state = SamplerRegistry::GetState()) != |
| 841 SamplerRegistry::HAS_NO_SAMPLERS) { | 841 SamplerRegistry::HAS_NO_SAMPLERS) { |
| 842 // When CPU profiling is enabled both JavaScript and C++ code is | 842 // When CPU profiling is enabled both JavaScript and C++ code is |
| 843 // profiled. We must not suspend. | 843 // profiled. We must not suspend. |
| 844 if (state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS) { | 844 if (state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS) { |
| 845 if (!signal_handler_installed_) InstallSignalHandler(); | 845 if (!signal_handler_installed_) InstallSignalHandler(); |
| 846 SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this); | 846 SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this); |
| 847 } else { | 847 } else { |
| 848 if (signal_handler_installed_) RestoreSignalHandler(); | 848 if (signal_handler_installed_) RestoreSignalHandler(); |
| 849 if (rate_limiter_.SuspendIfNecessary()) continue; | 849 if (RuntimeProfiler::WaitForSomeIsolateToEnterJS()) continue; |
| 850 } | 850 } |
| 851 Sleep(); // TODO(svenpanne) Figure out if OS:Sleep(interval_) is enough. | 851 Sleep(); // TODO(svenpanne) Figure out if OS:Sleep(interval_) is enough. |
| 852 } | 852 } |
| 853 } | 853 } |
| 854 | 854 |
| 855 static void DoCpuProfile(Sampler* sampler, void* raw_sender) { | 855 static void DoCpuProfile(Sampler* sampler, void* raw_sender) { |
| 856 if (!sampler->IsProfiling()) return; | 856 if (!sampler->IsProfiling()) return; |
| 857 SignalSender* sender = reinterpret_cast<SignalSender*>(raw_sender); | 857 SignalSender* sender = reinterpret_cast<SignalSender*>(raw_sender); |
| 858 sender->SendProfilingSignal(sampler->platform_data()->vm_tid()); | 858 sender->SendProfilingSignal(sampler->platform_data()->vm_tid()); |
| 859 } | 859 } |
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| 875 interval, | 875 interval, |
| 876 errno); | 876 errno); |
| 877 ASSERT(result == 0 || errno == EINTR); | 877 ASSERT(result == 0 || errno == EINTR); |
| 878 } | 878 } |
| 879 #endif | 879 #endif |
| 880 USE(result); | 880 USE(result); |
| 881 } | 881 } |
| 882 | 882 |
| 883 const int vm_tgid_; | 883 const int vm_tgid_; |
| 884 const int interval_; | 884 const int interval_; |
| 885 RuntimeProfilerRateLimiter rate_limiter_; | |
| 886 | 885 |
| 887 // Protects the process wide state below. | 886 // Protects the process wide state below. |
| 888 static Mutex* mutex_; | 887 static Mutex* mutex_; |
| 889 static SignalSender* instance_; | 888 static SignalSender* instance_; |
| 890 static bool signal_handler_installed_; | 889 static bool signal_handler_installed_; |
| 891 static struct sigaction old_signal_handler_; | 890 static struct sigaction old_signal_handler_; |
| 892 | 891 |
| 893 private: | 892 private: |
| 894 DISALLOW_COPY_AND_ASSIGN(SignalSender); | 893 DISALLOW_COPY_AND_ASSIGN(SignalSender); |
| 895 }; | 894 }; |
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| 940 | 939 |
| 941 | 940 |
| 942 void Sampler::Stop() { | 941 void Sampler::Stop() { |
| 943 ASSERT(IsActive()); | 942 ASSERT(IsActive()); |
| 944 SignalSender::RemoveActiveSampler(this); | 943 SignalSender::RemoveActiveSampler(this); |
| 945 SetActive(false); | 944 SetActive(false); |
| 946 } | 945 } |
| 947 | 946 |
| 948 | 947 |
| 949 } } // namespace v8::internal | 948 } } // namespace v8::internal |
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