Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc / deps / grpc / src / core / lib / transport / bdp_estimator.h

diff --git a/legacy-libs/grpc/deps/grpc/src/core/lib/transport/bdp_estimator.h b/legacy-libs/grpc/deps/grpc/src/core/lib/transport/bdp_estimator.h
new file mode 100644 (file)
index 0000000..6dc4d6b
--- /dev/null
+++ b/legacy-libs/grpc/deps/grpc/src/core/lib/transport/bdp_estimator.h
@@ -0,0 +1,94 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_CORE_LIB_TRANSPORT_BDP_ESTIMATOR_H
+#define GRPC_CORE_LIB_TRANSPORT_BDP_ESTIMATOR_H
+
+#include <grpc/support/port_platform.h>
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <grpc/support/log.h>
+#include <grpc/support/time.h>
+
+#include "src/core/lib/debug/trace.h"
+#include "src/core/lib/iomgr/exec_ctx.h"
+
+extern grpc_core::TraceFlag grpc_bdp_estimator_trace;
+
+namespace grpc_core {
+
+class BdpEstimator {
+ public:
+  explicit BdpEstimator(const char* name);
+  ~BdpEstimator() {}
+
+  int64_t EstimateBdp() const { return estimate_; }
+  double EstimateBandwidth() const { return bw_est_; }
+
+  void AddIncomingBytes(int64_t num_bytes) { accumulator_ += num_bytes; }
+
+  // Schedule a ping: call in response to receiving a true from
+  // grpc_bdp_estimator_add_incoming_bytes once a ping has been scheduled by a
+  // transport (but not necessarily started)
+  void SchedulePing() {
+    if (GRPC_TRACE_FLAG_ENABLED(grpc_bdp_estimator_trace)) {
+      gpr_log(GPR_INFO, "bdp[%s]:sched acc=%" PRId64 " est=%" PRId64, name_,
+              accumulator_, estimate_);
+    }
+    GPR_ASSERT(ping_state_ == PingState::UNSCHEDULED);
+    ping_state_ = PingState::SCHEDULED;
+    accumulator_ = 0;
+  }
+
+  // Start a ping: call after calling grpc_bdp_estimator_schedule_ping and
+  // once
+  // the ping is on the wire
+  void StartPing() {
+    if (GRPC_TRACE_FLAG_ENABLED(grpc_bdp_estimator_trace)) {
+      gpr_log(GPR_INFO, "bdp[%s]:start acc=%" PRId64 " est=%" PRId64, name_,
+              accumulator_, estimate_);
+    }
+    GPR_ASSERT(ping_state_ == PingState::SCHEDULED);
+    ping_state_ = PingState::STARTED;
+    accumulator_ = 0;
+    ping_start_time_ = gpr_now(GPR_CLOCK_MONOTONIC);
+  }
+
+  // Completes a previously started ping, returns when to schedule the next one
+  grpc_millis CompletePing();
+
+ private:
+  enum class PingState { UNSCHEDULED, SCHEDULED, STARTED };
+
+  PingState ping_state_;
+  int64_t accumulator_;
+  int64_t estimate_;
+  // when was the current ping started?
+  gpr_timespec ping_start_time_;
+  int inter_ping_delay_;
+  int stable_estimate_count_;
+  double bw_est_;
+  const char* name_;
+};
+
+}  // namespace grpc_core
+
+#endif /* GRPC_CORE_LIB_TRANSPORT_BDP_ESTIMATOR_H */