Reland^2 r22105 "Remove static initializer from isolate"

src/sampler.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/sampler.h"
 
 #if V8_OS_POSIX && !V8_OS_CYGWIN
 
 #define USE_SIGNALS
 
@@ skipping 313 matching lines @@
 
 void SignalHandler::HandleProfilerSignal(int signal, siginfo_t* info,
                                          void* context) {
 #if V8_OS_NACL
   // As Native Client does not support signal handling, profiling
   // is disabled.
   return;
 #else
   USE(info);
   if (signal != SIGPROF) return;
-  Isolate* isolate = Isolate::UncheckedCurrent();
+  Isolate* isolate = Isolate::UncheckedReentrantCurrent();
   if (isolate == NULL || !isolate->IsInitialized() || !isolate->IsInUse()) {
     // We require a fully initialized and entered isolate.
     return;
   }
   if (v8::Locker::IsActive() &&
       !isolate->thread_manager()->IsLockedByCurrentThread()) {
     return;
   }
 
   Sampler* sampler = isolate->logger()->sampler();
@@ skipping 383 matching lines @@
 #endif  // USE_SIMULATOR
     SampleStack(state);
   }
   ResumeThread(profiled_thread);
 }
 
 #endif  // USE_SIGNALS
 
 
 } }  // namespace v8::internal