Send SIGPROF signals on the profiler event processor thread

src/circular-queue.h

Index: src/circular-queue.h
diff --git a/src/circular-queue.h b/src/circular-queue.h
index 73afc6831671c10c4f3c1bdccd8983c6e2ee8600..a8eb524150ad376f43972367ff851d46976dc071 100644
--- a/src/circular-queue.h
+++ b/src/circular-queue.h
@@ -47,7 +47,8 @@ class SamplingCircularQueue {
   // 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
@@ -88,7 +89,6 @@ class SamplingCircularQueue {
   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_;