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 #include <stdbool.h> 24 25 // Timer Manager tries to keep only one thread waiting for the next timeout at 26 // all times, and thus effectively preventing the thundering herd problem. 27 28 void grpc_timer_manager_init(void); 29 void grpc_timer_manager_shutdown(void); 30 31 // enable/disable threading - must be called after grpc_timer_manager_init and 32 // before grpc_timer_manager_shutdown 33 void grpc_timer_manager_set_threading(bool enabled); 34 // enable/disable threading - must be called before first grpc init 35 void grpc_timer_manager_set_start_threaded(bool enabled); 36 // explicitly perform one tick of the timer system - for when threading is 37 // disabled 38 void grpc_timer_manager_tick(void); 39 // get global counter that tracks timer wakeups 40 uint64_t grpc_timer_manager_get_wakeups_testonly(void); 41 42 #endif // GRPC_SRC_CORE_LIB_IOMGR_TIMER_MANAGER_H 43