Resolve race between starting the profiler thread and the logging timer

src/log.cc

 // Copyright 2011 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/log.h"
 
 #include <cstdarg>
 #include <sstream>
 
 #include "src/v8.h"
@@ skipping 1848 matching lines @@
     ll_logger_ = new LowLevelLogger(log_file_name.str().c_str());
     addCodeEventListener(ll_logger_);
   }
 
   ticker_ = new Ticker(isolate, kSamplingIntervalMs);
 
   if (Log::InitLogAtStart()) {
     is_logging_ = true;
   }
 
+  if (FLAG_log_internal_timer_events || FLAG_prof) timer_.Start();
+
   if (FLAG_prof) {
     profiler_ = new Profiler(isolate);
     is_logging_ = true;
     profiler_->Engage();
   }
 
-  if (FLAG_log_internal_timer_events || FLAG_prof) timer_.Start();
-
   return true;
 }
 
 
 void Logger::SetCodeEventHandler(uint32_t options,
                                  JitCodeEventHandler event_handler) {
   if (jit_logger_) {
       removeCodeEventListener(jit_logger_);
       delete jit_logger_;
       jit_logger_ = NULL;
@@ skipping 51 matching lines @@
   if (jit_logger_) {
     removeCodeEventListener(jit_logger_);
     delete jit_logger_;
     jit_logger_ = NULL;
   }
 
   return log_->Close();
 }
 
 } }  // namespace v8::internal