--- /dev/null
+/*
+ *
+ * Copyright 2015 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.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/surface/channel.h"
+
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+#include "src/core/lib/surface/api_trace.h"
+#include "src/core/lib/surface/completion_queue.h"
+
+typedef struct {
+ grpc_closure closure;
+ void* tag;
+ grpc_completion_queue* cq;
+ grpc_cq_completion completion_storage;
+} ping_result;
+
+static void ping_destroy(void* arg, grpc_cq_completion* storage) {
+ gpr_free(arg);
+}
+
+static void ping_done(void* arg, grpc_error* error) {
+ ping_result* pr = static_cast<ping_result*>(arg);
+ grpc_cq_end_op(pr->cq, pr->tag, GRPC_ERROR_REF(error), ping_destroy, pr,
+ &pr->completion_storage);
+}
+
+void grpc_channel_ping(grpc_channel* channel, grpc_completion_queue* cq,
+ void* tag, void* reserved) {
+ GRPC_API_TRACE("grpc_channel_ping(channel=%p, cq=%p, tag=%p, reserved=%p)", 4,
+ (channel, cq, tag, reserved));
+ grpc_transport_op* op = grpc_make_transport_op(nullptr);
+ ping_result* pr = static_cast<ping_result*>(gpr_malloc(sizeof(*pr)));
+ grpc_channel_element* top_elem =
+ grpc_channel_stack_element(grpc_channel_get_channel_stack(channel), 0);
+ grpc_core::ExecCtx exec_ctx;
+ GPR_ASSERT(reserved == nullptr);
+ pr->tag = tag;
+ pr->cq = cq;
+ GRPC_CLOSURE_INIT(&pr->closure, ping_done, pr, grpc_schedule_on_exec_ctx);
+ op->send_ping.on_ack = &pr->closure;
+ op->bind_pollset = grpc_cq_pollset(cq);
+ GPR_ASSERT(grpc_cq_begin_op(cq, tag));
+ top_elem->filter->start_transport_op(top_elem, op);
+}