Robert Schmidt
66bf27bce9
SYS_NICE is a capability that allows a process to set thread affinity and priority, among other things (see capabilities(7) for more info). In this commit, add a function that allows to determine if the process has this capability, and try to change the thread affinity and priority, if requested. If the capability does not exist, the function will simply not attempt to change the corresponding thread attributes. To determine if the process has SYS_NICE, libcap can be used. However, it might not be installed by default. To avoid requiring another dependency, if we detect that libcap is not present, use a workaround by try to set a real-time scheduling policy; if it's present, or can be changed, we assume that the process has SYS_NICE (and clean up, if relevant). Simplify reading of capabilities
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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#ifndef _SYSTEM_H_OAI_
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#define _SYSTEM_H_OAI_
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#include <stdint.h>
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#include <pthread.h>
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/****************************************************
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* send a command to the background process
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* return -1 on error, 0 on success
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****************************************************/
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int background_system(char *command);
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/****************************************************
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* initialize the background process
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* to be called very early
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****************************************************/
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void start_background_system(void);
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void lock_memory_to_ram(void);
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bool has_cap_sys_nice(void);
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void threadCreate(pthread_t *t, void *(*func)(void *), void *param, char *name, int affinity, int priority);
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#define SCHED_OAI SCHED_RR
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#define OAI_PRIORITY_RT_LOW sched_get_priority_min(SCHED_OAI)
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#define OAI_PRIORITY_RT ((sched_get_priority_min(SCHED_OAI)+sched_get_priority_max(SCHED_OAI))/2)
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#define OAI_PRIORITY_RT_MAX sched_get_priority_max(SCHED_OAI)-2
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void thread_top_init(char *thread_name,
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int affinity,
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uint64_t runtime,
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uint64_t deadline,
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uint64_t period);
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/****************************************************
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* Functions to check system at runtime.
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****************************************************/
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int rt_sleep_ns (uint64_t x);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYSTEM_H_OAI_ */
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