Work around a kernel bug on Android.

runtime/vm/thread_interrupter_macos.cc

 // 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_MACOS)
 
 #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, thread_interrupter);
 DECLARE_FLAG(bool, trace_thread_interrupter);
 
-class ThreadInterrupterMacOS : 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;
-    }
-    // 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);
+
+static void ThreadInterruptSignalHandler(int signal, siginfo_t* info,
+                                         void* context_) {
+  if (signal != SIGPROF) {
+    return;
   }
-};
+  Thread* thread = Thread::Current();
+  if (thread == NULL) {
+    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::Print("ThreadInterrupter interrupting %p\n", thread->id());
   }
   int result = pthread_kill(thread->id(), SIGPROF);
   ASSERT((result == 0) || (result == ESRCH));
 }
 
 
 void ThreadInterrupter::InstallSignalHandler() {
-  SignalHandler::Install(ThreadInterrupterMacOS::ThreadInterruptSignalHandler);
+  SignalHandler::Install(ThreadInterruptSignalHandler);
 }
 
 
 void ThreadInterrupter::RemoveSignalHandler() {
   SignalHandler::Remove();
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)