| /* |
| * |
| * 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. |
| * |
| */ |
| |
| #ifndef GRPC_CORE_LIB_TRANSPORT_CONNECTIVITY_STATE_H |
| #define GRPC_CORE_LIB_TRANSPORT_CONNECTIVITY_STATE_H |
| |
| #include <grpc/grpc.h> |
| #include "src/core/lib/debug/trace.h" |
| #include "src/core/lib/iomgr/exec_ctx.h" |
| |
| typedef struct grpc_connectivity_state_watcher { |
| /** we keep watchers in a linked list */ |
| struct grpc_connectivity_state_watcher *next; |
| /** closure to notify on change */ |
| grpc_closure *notify; |
| /** the current state as believed by the watcher */ |
| grpc_connectivity_state *current; |
| } grpc_connectivity_state_watcher; |
| |
| typedef struct { |
| /** current grpc_connectivity_state */ |
| gpr_atm current_state_atm; |
| /** error associated with state */ |
| grpc_error *current_error; |
| /** all our watchers */ |
| grpc_connectivity_state_watcher *watchers; |
| /** a name to help debugging */ |
| char *name; |
| } grpc_connectivity_state_tracker; |
| |
| extern grpc_tracer_flag grpc_connectivity_state_trace; |
| |
| /** enum --> string conversion */ |
| const char *grpc_connectivity_state_name(grpc_connectivity_state state); |
| |
| void grpc_connectivity_state_init(grpc_connectivity_state_tracker *tracker, |
| grpc_connectivity_state init_state, |
| const char *name); |
| void grpc_connectivity_state_destroy(grpc_exec_ctx *exec_ctx, |
| grpc_connectivity_state_tracker *tracker); |
| |
| /** Set connectivity state; not thread safe; access must be serialized with an |
| * external lock */ |
| void grpc_connectivity_state_set(grpc_exec_ctx *exec_ctx, |
| grpc_connectivity_state_tracker *tracker, |
| grpc_connectivity_state state, |
| grpc_error *associated_error, |
| const char *reason); |
| |
| /** Return true if this connectivity state has watchers. |
| Access must be serialized with an external lock. */ |
| bool grpc_connectivity_state_has_watchers( |
| grpc_connectivity_state_tracker *tracker); |
| |
| /** Return the last seen connectivity state. No need to synchronize access. */ |
| grpc_connectivity_state grpc_connectivity_state_check( |
| grpc_connectivity_state_tracker *tracker); |
| |
| /** Return the last seen connectivity state, and the associated error. |
| Access must be serialized with an external lock. */ |
| grpc_connectivity_state grpc_connectivity_state_get( |
| grpc_connectivity_state_tracker *tracker, grpc_error **error); |
| |
| /** Return 1 if the channel should start connecting, 0 otherwise. |
| If current==NULL cancel notify if it is already queued (success==0 in that |
| case). |
| Access must be serialized with an external lock. */ |
| bool grpc_connectivity_state_notify_on_state_change( |
| grpc_exec_ctx *exec_ctx, grpc_connectivity_state_tracker *tracker, |
| grpc_connectivity_state *current, grpc_closure *notify); |
| |
| #endif /* GRPC_CORE_LIB_TRANSPORT_CONNECTIVITY_STATE_H */ |