| // 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; |
| } |
| Thread* thread = Thread::Current(); |
| if (thread == NULL) { |
| return; |
| } |
| ThreadInterruptCallback callback = NULL; |
| void* callback_data = NULL; |
| if (!thread->IsThreadInterrupterEnabled(&callback, &callback_data)) { |
| return; |
| } |
| // Extract thread state. |
| ucontext_t* context = reinterpret_cast<ucontext_t*>(context_); |
| mcontext_t mcontext = context->uc_mcontext; |
| InterruptedThreadState its; |
| its.tid = thread->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); |
| callback(its, callback_data); |
| } |
| }; |
| |
| |
| void ThreadInterrupter::InterruptThread(Thread* thread) { |
| if (FLAG_trace_thread_interrupter) { |
| OS::Print("ThreadInterrupter interrupting %p\n", |
| reinterpret_cast<void*>(thread->id())); |
| } |
| int result = syscall(__NR_tgkill, getpid(), thread->id(), SIGPROF); |
| ASSERT(result == 0); |
| } |
| |
| |
| void ThreadInterrupter::InstallSignalHandler() { |
| SignalHandler::Install( |
| ThreadInterrupterAndroid::ThreadInterruptSignalHandler); |
| } |
| |
| |
| void ThreadInterrupter::RemoveSignalHandler() { |
| SignalHandler::Remove(); |
| } |
| |
| } // namespace dart |
| |
| #endif // defined(TARGET_OS_ANDROID) |