Support profiler stack sampling in any situation.

src/platform-win32.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1732 matching lines @@
     // Loop until the sampler is disengaged.
     while (sampler_->IsActive()) {
       TickSample sample;
 
       // If profiling, we record the pc and sp of the profiled thread.
       if (sampler_->IsProfiling()) {
         // Pause the profiled thread and get its context.
         SuspendThread(profiled_thread_);
         context.ContextFlags = CONTEXT_FULL;
         GetThreadContext(profiled_thread_, &context);
-        ResumeThread(profiled_thread_);
         // Invoke tick handler with program counter and stack pointer.
         sample.pc = context.Eip;
         sample.sp = context.Esp;
         sample.fp = context.Ebp;
       }
 
       // We always sample the VM state.
       sample.state = Logger::state();
       sampler_->Tick(&sample);
 
+      if (sampler_->IsProfiling()) {
+        ResumeThread(profiled_thread_);
+      }
+
       // Wait until next sampling.
       Sleep(sampler_->interval_);
     }
   }
 };
 
 
 // Entry point for sampler thread.
 static unsigned int __stdcall SamplerEntry(void* arg) {
   Sampler::PlatformData* data =
@@ skipping 52 matching lines @@
 
   // Release the thread handles
   CloseHandle(data_->sampler_thread_);
   CloseHandle(data_->profiled_thread_);
 }
 
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal