Add multithreading test for SamplingCircularQueue, fix implementation.

test/cctest/test-cpu-profiler.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 //
 // Tests of profiles generator and utilities.
 
 #include "v8.h"
 #include "cpu-profiler-inl.h"
 #include "cctest.h"
 
 namespace i = v8::internal;
 
@@ skipping 46 matching lines @@
   }
 }
 
 TEST(CodeEvents) {
   InitializeVM();
   CpuProfilesCollection profiles;
   profiles.AddProfile(0);
   ProfileGenerator generator(&profiles);
   ProfilerEventsProcessor processor(&generator);
   processor.Start();
-  processor.SetUpSamplesProducer();
   while (!processor.running()) {
     i::Thread::YieldCPU();
   }
 
   // Enqueue code creation events.
   i::HandleScope scope;
   const char* aaa_str = "aaa";
   i::Handle<i::String> aaa_name = i::Factory::NewStringFromAscii(
       i::Vector<const char>(aaa_str, strlen(aaa_str)));
   processor.CodeCreateEvent(i::Logger::FUNCTION_TAG,
@@ skipping 32 matching lines @@
   CHECK_NE(NULL, entry3);
   CHECK_EQ("args_count: 5", entry3->name());
   CHECK_EQ(NULL, generator.code_map()->FindEntry(ToAddress(0x1400)));
   CodeEntry* entry4 = generator.code_map()->FindEntry(ToAddress(0x1500));
   CHECK_NE(NULL, entry4);
   CHECK_EQ("ddd", entry4->name());
   CHECK_EQ(NULL, generator.code_map()->FindEntry(ToAddress(0x1600)));
   CodeEntry* entry5 = generator.code_map()->FindEntry(ToAddress(0x1700));
   CHECK_NE(NULL, entry5);
   CHECK_EQ(aaa_str, entry5->name());
-
-  processor.TearDownSamplesProducer();
 }
 
 
 template<typename T>
 static int CompareProfileNodes(const T* p1, const T* p2) {
   return strcmp((*p1)->entry()->name(), (*p2)->entry()->name());
 }
 
 TEST(TickEvents) {
   CpuProfilesCollection profiles;
   profiles.AddProfile(0);
   ProfileGenerator generator(&profiles);
   ProfilerEventsProcessor processor(&generator);
   processor.Start();
-  processor.SetUpSamplesProducer();
   while (!processor.running()) {
     i::Thread::YieldCPU();
   }
 
   processor.CodeCreateEvent(i::Logger::BUILTIN_TAG,
                             "bbb",
                             ToAddress(0x1200),
                             0x80);
   processor.CodeCreateEvent(i::Logger::STUB_TAG, 5, ToAddress(0x1300), 0x10);
   processor.CodeCreateEvent(i::Logger::BUILTIN_TAG,
@@ skipping 43 matching lines @@
   bottom_up_root_children[1]->GetChildren(&bottom_up_bbb_children);
   CHECK_EQ(0, bottom_up_bbb_children.length());
   i::List<ProfileNode*> bottom_up_ddd_children;
   bottom_up_root_children[2]->GetChildren(&bottom_up_ddd_children);
   CHECK_EQ(1, bottom_up_ddd_children.length());
   CHECK_EQ("args_count: 5", bottom_up_ddd_children.last()->entry()->name());
   i::List<ProfileNode*> bottom_up_ddd_stub_children;
   bottom_up_ddd_children.last()->GetChildren(&bottom_up_ddd_stub_children);
   CHECK_EQ(1, bottom_up_ddd_stub_children.length());
   CHECK_EQ("bbb", bottom_up_ddd_stub_children.last()->entry()->name());
-
-  processor.TearDownSamplesProducer();
 }