Initial checkin of gRPC to third_party/

third_party/grpc/src/cpp/server/dynamic_thread_pool.h

Index: third_party/grpc/src/cpp/server/dynamic_thread_pool.h
diff --git a/third_party/tcmalloc/vendor/src/base/spinlock_internal.h b/third_party/grpc/src/cpp/server/dynamic_thread_pool.h
similarity index 56%
copy from third_party/tcmalloc/vendor/src/base/spinlock_internal.h
copy to third_party/grpc/src/cpp/server/dynamic_thread_pool.h
index 44942609f40a87492a7aeed0068a5e27bf9cd157..5ba7533c05f41872cf10edb14609fd47376e2383 100644
--- a/third_party/tcmalloc/vendor/src/base/spinlock_internal.h
+++ b/third_party/grpc/src/cpp/server/dynamic_thread_pool.h
@@ -1,4 +1,6 @@
-/* Copyright (c) 2010, Google Inc.
+/*
+ *
+ * Copyright 2015, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -27,38 +29,55 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * ---
- * This file is an internal part spinlock.cc and once.cc
- * It may not be used directly by code outside of //base.
  */
 
-#ifndef BASE_SPINLOCK_INTERNAL_H_
-#define BASE_SPINLOCK_INTERNAL_H_
+#ifndef GRPC_INTERNAL_CPP_DYNAMIC_THREAD_POOL_H
+#define GRPC_INTERNAL_CPP_DYNAMIC_THREAD_POOL_H
+
+#include <list>
+#include <memory>
+#include <queue>
+
+#include <grpc++/impl/sync.h>
+#include <grpc++/impl/thd.h>
+#include <grpc++/support/config.h>
+
+#include "src/cpp/server/thread_pool_interface.h"
+
+namespace grpc {
+
+class DynamicThreadPool GRPC_FINAL : public ThreadPoolInterface {
+ public:
+  explicit DynamicThreadPool(int reserve_threads);
+  ~DynamicThreadPool();
+
+  void Add(const std::function<void()>& callback) GRPC_OVERRIDE;
 
-#include <config.h>
-#include "base/basictypes.h"
-#include "base/atomicops.h"
+ private:
+  class DynamicThread {
+   public:
+    DynamicThread(DynamicThreadPool* pool);
+    ~DynamicThread();
 
-namespace base {
-namespace internal {
+   private:
+    DynamicThreadPool* pool_;
+    std::unique_ptr<grpc::thread> thd_;
+    void ThreadFunc();
+  };
+  grpc::mutex mu_;
+  grpc::condition_variable cv_;
+  grpc::condition_variable shutdown_cv_;
+  bool shutdown_;
+  std::queue<std::function<void()>> callbacks_;
+  int reserve_threads_;
+  int nthreads_;
+  int threads_waiting_;
+  std::list<DynamicThread*> dead_threads_;
 
-// SpinLockWait() waits until it can perform one of several transitions from
-// "from" to "to".  It returns when it performs a transition where done==true.
-struct SpinLockWaitTransition {
-  int32 from;
-  int32 to;
-  bool done;
+  void ThreadFunc();
+  static void ReapThreads(std::list<DynamicThread*>* tlist);
 };
 
-// Wait until *w can transition from trans[i].from to trans[i].to for some i
-// satisfying 0<=i<n && trans[i].done, atomically make the transition,
-// then return the old value of *w.   Make any other atomic tranistions
-// where !trans[i].done, but continue waiting.
-int32 SpinLockWait(volatile Atomic32 *w, int n,
-                   const SpinLockWaitTransition trans[]);
-void SpinLockWake(volatile Atomic32 *w, bool all);
-void SpinLockDelay(volatile Atomic32 *w, int32 value, int loop);
+}  // namespace grpc
 
-} // namespace internal
-} // namespace base
-#endif
+#endif  // GRPC_INTERNAL_CPP_DYNAMIC_THREAD_POOL_H