Initial checkin of gRPC to third_party/

third_party/grpc/src/cpp/common/completion_queue.cc

+/*
+ * 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.
+ *
+ */
+
+#include <grpc++/completion_queue.h>
+
+#include <memory>
+
+#include <grpc++/impl/codegen/completion_queue_tag.h>
+#include <grpc++/impl/grpc_library.h>
+#include <grpc++/support/time.h>
+#include <grpc/grpc.h>
+#include <grpc/support/log.h>
+
+namespace grpc {
+
+static internal::GrpcLibraryInitializer g_gli_initializer;
+CompletionQueue::CompletionQueue() {
+  g_gli_initializer.summon();
+  cq_ = grpc_completion_queue_create(nullptr);
+}
+
+CompletionQueue::CompletionQueue(grpc_completion_queue* take) : cq_(take) {}
+
+CompletionQueue::~CompletionQueue() { grpc_completion_queue_destroy(cq_); }
+
+void CompletionQueue::Shutdown() { grpc_completion_queue_shutdown(cq_); }
+
+CompletionQueue::NextStatus CompletionQueue::AsyncNextInternal(
+    void** tag, bool* ok, gpr_timespec deadline) {
+  for (;;) {
+    auto ev = grpc_completion_queue_next(cq_, deadline, nullptr);
+    switch (ev.type) {
+      case GRPC_QUEUE_TIMEOUT:
+        return TIMEOUT;
+      case GRPC_QUEUE_SHUTDOWN:
+        return SHUTDOWN;
+      case GRPC_OP_COMPLETE:
+        auto cq_tag = static_cast<CompletionQueueTag*>(ev.tag);
+        *ok = ev.success != 0;
+        *tag = cq_tag;
+        if (cq_tag->FinalizeResult(tag, ok)) {
+          return GOT_EVENT;
+        }
+        break;
+    }
+  }
+}
+
+bool CompletionQueue::Pluck(CompletionQueueTag* tag) {
+  auto deadline = gpr_inf_future(GPR_CLOCK_REALTIME);
+  auto ev = grpc_completion_queue_pluck(cq_, tag, deadline, nullptr);
+  bool ok = ev.success != 0;
+  void* ignored = tag;
+  GPR_ASSERT(tag->FinalizeResult(&ignored, &ok));
+  GPR_ASSERT(ignored == tag);
+  // Ignore mutations by FinalizeResult: Pluck returns the C API status
+  return ev.success != 0;
+}
+
+void CompletionQueue::TryPluck(CompletionQueueTag* tag) {
+  auto deadline = gpr_time_0(GPR_CLOCK_REALTIME);
+  auto ev = grpc_completion_queue_pluck(cq_, tag, deadline, nullptr);
+  if (ev.type == GRPC_QUEUE_TIMEOUT) return;
+  bool ok = ev.success != 0;
+  void* ignored = tag;
+  // the tag must be swallowed if using TryPluck
+  GPR_ASSERT(!tag->FinalizeResult(&ignored, &ok));
+}
+
+}  // namespace grpc