Initial checkin of gRPC to third_party/

third_party/grpc/include/grpc++/impl/codegen/sync_no_cxx11.h

Index: third_party/grpc/include/grpc++/impl/codegen/sync_no_cxx11.h
diff --git a/third_party/grpc/include/grpc++/impl/codegen/sync_no_cxx11.h b/third_party/grpc/include/grpc++/impl/codegen/sync_no_cxx11.h
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index 0000000000000000000000000000000000000000..8dea84736719beddfc13486da27abfcfc5edfe2b
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+++ b/third_party/grpc/include/grpc++/impl/codegen/sync_no_cxx11.h
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+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * 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.
+ *
+ */
+
+#ifndef GRPCXX_IMPL_CODEGEN_SYNC_NO_CXX11_H
+#define GRPCXX_IMPL_CODEGEN_SYNC_NO_CXX11_H
+
+#include <grpc/impl/codegen/sync.h>
+
+namespace grpc {
+
+template <class mutex>
+class lock_guard;
+class condition_variable;
+
+class mutex {
+ public:
+  mutex() { gpr_mu_init(&mu_); }
+  ~mutex() { gpr_mu_destroy(&mu_); }
+
+ private:
+  ::gpr_mu mu_;
+  template <class mutex>
+  friend class lock_guard;
+  friend class condition_variable;
+};
+
+template <class mutex>
+class lock_guard {
+ public:
+  lock_guard(mutex &mu) : mu_(mu), locked(true) { gpr_mu_lock(&mu.mu_); }
+  ~lock_guard() { unlock_internal(); }
+
+ protected:
+  void lock_internal() {
+    if (!locked) gpr_mu_lock(&mu_.mu_);
+    locked = true;
+  }
+  void unlock_internal() {
+    if (locked) gpr_mu_unlock(&mu_.mu_);
+    locked = false;
+  }
+
+ private:
+  mutex &mu_;
+  bool locked;
+  friend class condition_variable;
+};
+
+template <class mutex>
+class unique_lock : public lock_guard<mutex> {
+ public:
+  unique_lock(mutex &mu) : lock_guard<mutex>(mu) {}
+  void lock() { this->lock_internal(); }
+  void unlock() { this->unlock_internal(); }
+};
+
+class condition_variable {
+ public:
+  condition_variable() { gpr_cv_init(&cv_); }
+  ~condition_variable() { gpr_cv_destroy(&cv_); }
+  void wait(lock_guard<mutex> &mu) {
+    mu.locked = false;
+    gpr_cv_wait(&cv_, &mu.mu_.mu_, gpr_inf_future(GPR_CLOCK_REALTIME));
+    mu.locked = true;
+  }
+  void notify_one() { gpr_cv_signal(&cv_); }
+  void notify_all() { gpr_cv_broadcast(&cv_); }
+
+ private:
+  gpr_cv cv_;
+};
+
+}  // namespace grpc
+
+#endif  // GRPCXX_IMPL_CODEGEN_SYNC_NO_CXX11_H