1 //
2 //
3 // Copyright 2017 gRPC authors.
4 //
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 //
9 //     http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 //
17 //
18 
19 #ifndef GRPC_SRC_CORE_LIB_IOMGR_TIMER_MANAGER_H
20 #define GRPC_SRC_CORE_LIB_IOMGR_TIMER_MANAGER_H
21 
22 #include <grpc/support/port_platform.h>
23 
24 #include <stdbool.h>
25 
26 // Timer Manager tries to keep only one thread waiting for the next timeout at
27 // all times, and thus effectively preventing the thundering herd problem.
28 
29 void grpc_timer_manager_init(void);
30 void grpc_timer_manager_shutdown(void);
31 
32 // enable/disable threading - must be called after grpc_timer_manager_init and
33 // before grpc_timer_manager_shutdown
34 void grpc_timer_manager_set_threading(bool enabled);
35 // explicitly perform one tick of the timer system - for when threading is
36 // disabled
37 void grpc_timer_manager_tick(void);
38 // get global counter that tracks timer wakeups
39 uint64_t grpc_timer_manager_get_wakeups_testonly(void);
40 
41 #endif  // GRPC_SRC_CORE_LIB_IOMGR_TIMER_MANAGER_H
42