[英]sched_setscheduler is for all threads or main thread?
I have the following source which like to have SCHED_RR priority 90 : 我有以下来源喜欢SCHED_RR优先级90:
int main(int argc, char** argv)
{
const char *sched_policy[] = {
"SCHED_OTHER",
"SCHED_FIFO",
"SCHED_RR",
"SCHED_BATCH"
};
struct sched_param sp = {
.sched_priority = 90
};
pid_t pid = getpid();
printf("pid=(%d)\n",pid);
sched_setscheduler(pid, SCHED_RR, &sp);
printf("Scheduler Policy is %s.\n", sched_policy[sched_getscheduler(pid)]);
pthread_t tid ;
pthread_create(&tid , NULL, Thread1 , (void*)(long)3);
pthread_create(&tid , NULL, Thread2 , (void*)(long)3);
pthread_create(&tid , NULL, Thread3 , (void*)(long)3);
while(1)
sleep(100);
}
while shell "top" , I can see that process has PR with -91 , look like it works, As I know , in Linux , thread1 and thread2 and thread3 are different tasks from the main thread , they just share the same virtual memory , I like to know in this test , should I need to add 虽然shell“top”,我可以看到进程有-91的PR,看起来很有效,据我所知,在Linux中,thread1和thread2以及thread3是来自主线程的不同任务,它们只是共享相同的虚拟内存,我想知道在这个测试中,我是否需要添加
pthread_setschedparam(pthread_self(), SCHED_RR, &sp);
for all thread1,thread2 and thread3 so that all these 3 can be scheduled with SCHED_RR ?! 对于所有thread1,thread2和thread3,以便所有这3个可以使用SCHED_RR进行调度? or I don't need to do that ?!
或者我不需要这样做?! and how can I observe that thread1,thread2 and thread3 thread are SCHED_RR or SCHED_OTHER ?!
如何观察thread1,thread2和thread3线程是SCHED_RR还是SCHED_OTHER?
Edit : 编辑:
sudo chrt -v -r 90 ./xxx.exe
will see : 等着瞧 :
pid 7187's new scheduling policy: SCHED_RR
pid 7187's new scheduling priority: 90
how can I be sure this is only for main thread ?! 我怎么能确定这只是主线程? or all threads in pid 7187 are SCHED_RR policy ?!
或pid 7187中的所有线程都是SCHED_RR策略?! and again , how to observe it ?!
再次,如何观察它?!
You shall check (and set, if required) the scheduler inheritance attributes before creating any new thread. 在创建任何新线程之前,您应检查(并设置,如果需要)调度程序继承属性。
int pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inheritsched);
int pthread_attr_setinheritsched(pthread_attr_t *attr, int inheritsched);
The pthread_attr_getinheritsched()
will store in the variable pointed by inheritsched
one of two possible values: pthread_attr_getinheritsched()
将存储在inheritsched
指向的变量中,其中包含两个可能的值之一:
PTHREAD_INHERIT_SCHED - Threads that are created using attr
PTHREAD_INHERIT_SCHED - 使用attr创建的线程
inherit scheduling attributes from the creating thread;从创建线程继承调度属性; the scheduling attributes in attr are ignored.
attr中的调度属性被忽略。
PTHREAD_EXPLICIT_SCHED - Threads that are created using attr take their scheduling attributes from the values specified by the attributes object.
PTHREAD_EXPLICIT_SCHED - 使用attr创建的线程从属性对象指定的值中获取其调度属性。
If you want that every newly created thread inherits the scheduler attributes of the calling task, you should set PTHREAD_INHERIT_SCHED (if not already set). 如果您希望每个新创建的线程都继承调用任务的调度程序属性,则应设置PTHREAD_INHERIT_SCHED(如果尚未设置)。
Also note: 另请注意:
The default setting of the inherit-scheduler attribute in a newly initialized thread attributes object is PTHREAD_INHERIT_SCHED
新初始化的线程属性对象中的inherit-scheduler属性的默认设置是PTHREAD_INHERIT_SCHED
References 参考
$ man pthread_setschedparam
$ man pthread_attr_setinheritsched
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