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_CORE_LIB_IOMGR_TIMER_MANAGER_H 20 #define GRPC_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_CORE_LIB_IOMGR_TIMER_MANAGER_H */ 42