Run Crankshaft on a separate thread.

src/optimizing-compiler-thread.cc

+// 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "optimizing-compiler-thread.h"
+
+#include "isolate.h"
+#include "v8threads.h"
+
+namespace v8 {
+namespace internal {
+
+
+void OptimizingCompilerThread::Run() {
+  while (true) {
+    queue_semaphore_->Wait();
+    if (Acquire_Load(&stop_thread_)) {
+      return;
+    }
+    Handle<JSFunction> function;
+    {
+      ScopedLock mutex_lock(queue_mutex_);
+      queue_.Dequeue(&function);
+    }
+
+    Locker lock(reinterpret_cast<v8::Isolate*>(isolate_));
+    if (Acquire_Load(&stop_thread_)) {
+      return;
+    }
+
+    if (isolate_->context() == NULL || !isolate_->context()->IsContext()) {
+      continue;
+    }
+
+    isolate_->Enter();
+    {
+      HandleScope scope(isolate_);
+      if (!function->IsOptimized()) {
+        isolate_->factory()->CompileJSFunction(function);
+        isolate_->counters()->functions_compiled_parallely()->Increment();
+      }
+
+      isolate_->global_handles()->Destroy(
+          reinterpret_cast<Object **>(function.location()));
+    }
+    isolate_->Exit();
+  }
+}
+
+
+void OptimizingCompilerThread::StopThread() {
+  Release_Store(&stop_thread_, static_cast<AtomicWord>(true));
+  queue_semaphore_->Signal();
+  {
+    // We don't need to use the Unlocker class here because we don't
+    // need to present a consistent view of the isolate to the
+    // optimizing compiler thread at this point.  Either the compiler
+    // is waiting for the ThreadManager lock and will return
+    // immediately after the getting it or is currently optimizing a
+    // function and hence already has the lock.
+
+    bool to_unlock = isolate_->thread_manager()->IsLockedByCurrentThread();
+    if (to_unlock)
+      isolate_->thread_manager()->Unlock();
+
+    Join();
+
+    if (to_unlock)
+      isolate_->thread_manager()->Lock();
+  }
+
+  Handle<JSFunction> not_used;
+  while (!queue_.IsEmpty()) {
+    queue_.Dequeue(&not_used);
+  }
+}
+
+
+void OptimizingCompilerThread::QueueForOptimization(
+    Handle<JSFunction> function) {
+  {
+    ScopedLock lock(queue_mutex_);
+    queue_.Enqueue(function);
+  }
+  queue_semaphore_->Signal();
+  Unlocker unlock(reinterpret_cast<v8::Isolate*>(isolate_));
+  Thread::YieldCPU();
+}
+
+
+} }  // namespace v8::internal
+