blob: 237d7836321dd989f9ec45a8366a1542fc585a8b [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(TARGET_OS_ANDROID)
#include <sys/syscall.h> // NOLINT
#include "vm/flags.h"
#include "vm/os.h"
#include "vm/signal_handler.h"
#include "vm/thread_interrupter.h"
namespace dart {
DECLARE_FLAG(bool, thread_interrupter);
DECLARE_FLAG(bool, trace_thread_interrupter);
class ThreadInterrupterAndroid : public AllStatic {
public:
static void ThreadInterruptSignalHandler(int signal, siginfo_t* info,
void* context_) {
if (signal != SIGPROF) {
return;
}
InterruptableThreadState* state = ThreadInterrupter::CurrentThreadState();
if ((state == NULL) || (state->callback == NULL)) {
// No interrupter state or callback.
return;
}
ASSERT(OSThread::Compare(state->id, OSThread::GetCurrentThreadId()));
// Extract thread state.
ucontext_t* context = reinterpret_cast<ucontext_t*>(context_);
mcontext_t mcontext = context->uc_mcontext;
InterruptedThreadState its;
its.tid = state->id;
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);
state->callback(its, state->data);
}
};
void ThreadInterrupter::InterruptThread(InterruptableThreadState* state) {
if (FLAG_trace_thread_interrupter) {
OS::Print("ThreadInterrupter interrupting %p\n",
reinterpret_cast<void*>(state->id));
}
syscall(__NR_tgkill, getpid(), state->id, SIGPROF);
}
void ThreadInterrupter::InstallSignalHandler() {
SignalHandler::Install(
ThreadInterrupterAndroid::ThreadInterruptSignalHandler);
}
} // namespace dart
#endif // defined(TARGET_OS_ANDROID)