blob: 5d7661df6b0e86a207941f45358266f33951259a [file] [log] [blame]
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "platform/globals.h"
#if defined(DART_HOST_OS_LINUX)
#include <errno.h> // NOLINT
#include "vm/flags.h"
#include "vm/os.h"
#include "vm/profiler.h"
#include "vm/signal_handler.h"
#include "vm/thread_interrupter.h"
namespace dart {
#ifndef PRODUCT
DECLARE_FLAG(bool, trace_thread_interrupter);
class ThreadInterrupterLinux : public AllStatic {
public:
static void ThreadInterruptSignalHandler(int signal,
siginfo_t* info,
void* context_) {
if (signal != SIGPROF) {
return;
}
Thread* thread = Thread::Current();
if (thread == NULL) {
return;
}
ThreadInterrupter::SampleBufferWriterScope scope;
if (!scope.CanSample()) {
return;
}
// Extract thread state.
ucontext_t* context = reinterpret_cast<ucontext_t*>(context_);
mcontext_t mcontext = context->uc_mcontext;
InterruptedThreadState its;
its.pc = SignalHandler::GetProgramCounter(mcontext);
its.fp = SignalHandler::GetFramePointer(mcontext);
its.csp = SignalHandler::GetCStackPointer(mcontext);
its.dsp = SignalHandler::GetDartStackPointer(mcontext);
its.lr = SignalHandler::GetLinkRegister(mcontext);
Profiler::SampleThread(thread, its);
}
};
void ThreadInterrupter::InterruptThread(OSThread* thread) {
if (FLAG_trace_thread_interrupter) {
OS::PrintErr("ThreadInterrupter interrupting %p\n",
reinterpret_cast<void*>(thread->id()));
}
int result = pthread_kill(thread->id(), SIGPROF);
ASSERT((result == 0) || (result == ESRCH));
}
void ThreadInterrupter::InstallSignalHandler() {
SignalHandler::Install(&ThreadInterrupterLinux::ThreadInterruptSignalHandler);
}
void ThreadInterrupter::RemoveSignalHandler() {
SignalHandler::Remove();
}
#endif // !PRODUCT
} // namespace dart
#endif // defined(DART_HOST_OS_LINUX)