Send SIGPROF signals on the profiler event processor thread

src/circular-queue.h

 // Copyright 2010 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 29 matching lines @@
 // simultaneous reads and writes to adjanced memory locations.
 //
 // IMPORTANT: as a producer never checks for chunks cleanness, it is
 // possible that it can catch up and overwrite a chunk that a consumer
 // is currently reading, resulting in a corrupt record being read.
 class SamplingCircularQueue {
  public:
   // Executed on the application thread.
   SamplingCircularQueue(int record_size_in_bytes,
                         int desired_chunk_size_in_bytes,
-                        int buffer_size_in_chunks);
+                        int buffer_size_in_chunks,
+                        bool keep_producer_consumer_distance = true);
   ~SamplingCircularQueue();
 
   // Enqueue returns a pointer to a memory location for storing the next
   // record.
   INLINE(void* Enqueue());
 
   // Executed on the consumer (analyzer) thread.
   // StartDequeue returns a pointer to a memory location for retrieving
   // the next record. After the record had been read by a consumer,
   // FinishDequeue must be called. Until that moment, subsequent calls
@@ skipping 20 matching lines @@
     Cell* dequeue_pos;
     Cell* dequeue_end_pos;
   };
 
   INLINE(void WrapPositionIfNeeded(Cell** pos));
 
   const int record_size_;
   const int chunk_size_in_bytes_;
   const int chunk_size_;
   const int buffer_size_;
-  const int producer_consumer_distance_;
   Cell* buffer_;
   byte* positions_;
   ProducerPosition* producer_pos_;
   ConsumerPosition* consumer_pos_;
 
   DISALLOW_COPY_AND_ASSIGN(SamplingCircularQueue);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_CIRCULAR_QUEUE_H_