pthread_setschedparam(3)   Library Functions Manual   pthread_setschedparam(3)

<?><?><?>
       pthread_setschedparam, pthread_getschedparam -
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       <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?>

LIBRARY
       POSIX threads library (libpthread, -lpthread)

<?><?><?><?><?><?><?><?><?>
       #include <pthread.h>

       int pthread_setschedparam(pthread_t thread, int policy,
                                 const struct sched_param *param);
       int pthread_getschedparam(pthread_t thread, int *restrict policy,
                                 struct sched_param *restrict param);

<?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> pthread_setschedparam()
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?> <?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?> thread.

       <?> policy <?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?> thread.
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
       policy <?> <?><?> <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?> <?>
       sched(7).

       <?><?><?><?><?><?><?><?><?>, <?><?> <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?> param <?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?> <?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?> thread.
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       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?>:

           struct sched_param {
               int sched_priority;     /* <?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?> */
           };

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       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?> sched(7).

       <?><?><?><?><?><?><?> pthread_getschedparam()
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?> <?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?> thread <?> <?><?><?><?><?>, <?><?><?><?><?><?><?><?><?>
       policy <?> param, <?><?><?><?><?><?><?><?><?><?><?><?><?><?>.
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       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?>
       pthread_setschedparam(), pthread_setschedprio(3) <?><?><?>
       pthread_create(3), <?><?><?><?><?><?><?><?><?><?><?><?> <?> thread.
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       <?><?><?> <?><?><?><?><?><?><?> (<?><?><?><?><?><?><?><?>,
       <?><?><?><?><?><?><?><?> pthread_mutexattr_setprioceiling(3) <?>
       pthread_mutexattr_setprotocol(3)).

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       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?> <?><?><?><?><?><?>.
       <?><?><?><?> pthread_setschedparam() <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?>, <?><?> <?><?><?><?><?><?><?><?><?> <?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?> thread
       <?><?> <?><?><?><?><?><?><?><?><?><?>.

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       <?><?><?><?><?><?><?><?><?><?><?> <?><?> <?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?>:

       ESRCH  <?><?><?><?> <?> <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
              thread <?><?> <?><?><?><?><?><?><?>.

       <?><?><?><?><?><?><?> pthread_setschedparam() <?><?><?><?><?>
       <?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?> <?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>:

       EINVAL <?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
              policy <?><?><?> <?><?><?><?><?><?><?><?> param <?><?>
              <?><?><?><?><?> <?><?><?><?><?><?> <?><?><?> policy.

       EPERM  <?><?><?><?><?><?><?><?><?><?> <?><?> <?><?><?><?><?>
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              <?><?><?><?><?><?><?><?><?><?><?><?> <?>
              <?><?><?><?><?><?><?><?><?><?>.

       <?><?><?> pthread_setschedparam() <?> POSIX.1 <?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?> ENOTSUP (<<<?><?><?><?><?><?><?>
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       <?><?><?><?><?><?><?><?>>>).

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       <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> <?> attributes(7).

       +----------------------------+----------------------------------------------------------+--------------------------+
       |<?><?><?><?><?><?><?><?><?> | <?><?><?><?><?><?><?>                                    | <?><?><?><?><?><?><?><?> |
       +----------------------------+----------------------------------------------------------+--------------------------+
       |pthread_setschedparam(),    | <?><?><?><?><?><?><?><?><?><?><?><?> <?> <?><?><?><?><?> | MT-Safe                  |
       |pthread_getschedparam()     |                                                          |                          |
       +----------------------------+----------------------------------------------------------+--------------------------+
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       POSIX.1-2008.

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       glibc 2.0 POSIX.1-2001.

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       sched(7).

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       <?><?><?><?><?><?><?><?><?><?><?><?><?> pthread_setschedparam() <?>
       pthread_getschedparam(), <?> <?><?><?><?><?> <?><?><?><?><?><?>
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       pthreads.

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       <?><?><?><?><?><?><?><?><?><?><?><?> 20. <?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> (<?>
       <?><?><?><?><?><?><?> pthread_attr_setinheritsched(3))
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       <?><?><?><?><?><?><?><?><?><?><?><?>.

           $ su      # Need privilege to set real-time scheduling policies
           Password:
           # ./a.out -mf10 -ar20 -i e
           Scheduler settings of main thread
               policy=SCHED_FIFO, priority=10

           Scheduler settings in 'attr'
               policy=SCHED_RR, priority=20
               inheritsched is EXPLICIT

           Scheduler attributes of new thread
               policy=SCHED_RR, priority=20

       <?> <?><?><?><?><?><?><?><?><?><?> <?><?><?><?> <?><?><?><?><?><?>
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       <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?>
       PTHREAD_INHERIT_SCHED, <?><?> <?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?> <?>
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       <?><?><?><?><?><?><?><?> <?> <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?>, <?> <?><?><?><?><?> <?><?>
       <?><?> <?><?><?><?><?><?><?><?><?> <?><?><?><?>.

           # ./a.out -mf10 -ar20 -i i
           Scheduler settings of main thread
               policy=SCHED_FIFO, priority=10

           Scheduler settings in 'attr'
               policy=SCHED_RR, priority=20
               inheritsched is INHERIT

           Scheduler attributes of new thread
               policy=SCHED_FIFO, priority=10

       <?> <?><?><?><?><?><?><?><?><?><?> <?><?><?><?> <?><?><?><?><?><?>
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       <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?> <?><?><?><?>.

       Note that if we had omitted the -i i option, the output would have been
       the same, since PTHREAD_INHERIT_SCHED is the default for the inherit
       scheduler attribute.

   <?><?><?><?><?><?><?><?> <?><?><?> <?><?><?><?><?><?><?><?><?>
       /* pthreads_sched_test.c */

       #include <errno.h>
       #include <pthread.h>
       #include <stdio.h>
       #include <stdlib.h>
       #include <unistd.h>

       #define handle_error_en(en, msg) \
               do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)

       [[noreturn]]
       static void
       usage(char *prog_name, char *msg)
       {
           if (msg != NULL)
               fputs(msg, stderr);

           fprintf(stderr, "Usage: %s [options]\n", prog_name);
           fprintf(stderr, "Options are:\n");
       #define fpe(msg) fprintf(stderr, "\t%s", msg)          /* Shorter */
           fpe("-a<policy><prio> Set scheduling policy and priority in\n");
           fpe("                 thread attributes object\n");
           fpe("                 <policy> can be\n");
           fpe("                     f  SCHED_FIFO\n");
           fpe("                     r  SCHED_RR\n");
           fpe("                     o  SCHED_OTHER\n");
           fpe("-A               Use default thread attributes object\n");
           fpe("-i {e|i}         Set inherit scheduler attribute to\n");
           fpe("                 'explicit' or 'inherit'\n");
           fpe("-m<policy><prio> Set scheduling policy and priority on\n");
           fpe("                 main thread before pthread_create() call\n");
           exit(EXIT_FAILURE);
       }

       static int
       get_policy(char p, int *policy)
       {
           switch (p) {
           case 'f': *policy = SCHED_FIFO;     return 1;
           case 'r': *policy = SCHED_RR;       return 1;
           case 'o': *policy = SCHED_OTHER;    return 1;
           default:  return 0;
           }
       }

       static void
       display_sched_attr(int policy, const struct sched_param *param)
       {
           printf("    policy=%s, priority=%d\n",
                  (policy == SCHED_FIFO)  ? "SCHED_FIFO" :
                  (policy == SCHED_RR)    ? "SCHED_RR" :
                  (policy == SCHED_OTHER) ? "SCHED_OTHER" :
                  "???",
                  param->sched_priority);
       }

       static void
       display_thread_sched_attr(char *msg)
       {
           int policy, s;
           struct sched_param param;

           s = pthread_getschedparam(pthread_self(), &policy, &param);
           if (s != 0)
               handle_error_en(s, "pthread_getschedparam");

           printf("%s\n", msg);
           display_sched_attr(policy, &param);
       }

       static void *
       thread_start(void *arg)
       {
           display_thread_sched_attr("Scheduler attributes of new thread");

           return NULL;
       }

       int
       main(int argc, char *argv[])
       {
           int s, opt, inheritsched, use_null_attrib, policy;
           pthread_t thread;
           pthread_attr_t attr;
           pthread_attr_t *attrp;
           char *attr_sched_str, *main_sched_str, *inheritsched_str;
           struct sched_param param;

           /* Process command-line options. */

           use_null_attrib = 0;
           attr_sched_str = NULL;
           main_sched_str = NULL;
           inheritsched_str = NULL;

           while ((opt = getopt(argc, argv, "a:Ai:m:")) != -1) {
               switch (opt) {
               case 'a': attr_sched_str = optarg;      break;
               case 'A': use_null_attrib = 1;          break;
               case 'i': inheritsched_str = optarg;    break;
               case 'm': main_sched_str = optarg;      break;
               default:  usage(argv[0], "Unrecognized option\n");
               }
           }

           if (use_null_attrib
               && (inheritsched_str != NULL || attr_sched_str != NULL))
           {
               usage(argv[0], "Can't specify -A with -i or -a\n");
           }

           /* Optionally set scheduling attributes of main thread,
              and display the attributes. */

           if (main_sched_str != NULL) {
               if (!get_policy(main_sched_str[0], &policy))
                   usage(argv[0], "Bad policy for main thread (-m)\n");
               param.sched_priority = strtol(&main_sched_str[1], NULL, 0);

               s = pthread_setschedparam(pthread_self(), policy, &param);
               if (s != 0)
                   handle_error_en(s, "pthread_setschedparam");
           }

           display_thread_sched_attr("Scheduler settings of main thread");
           printf("\n");

           /* Initialize thread attributes object according to options. */

           attrp = NULL;

           if (!use_null_attrib) {
               s = pthread_attr_init(&attr);
               if (s != 0)
                   handle_error_en(s, "pthread_attr_init");
               attrp = &attr;
           }

           if (inheritsched_str != NULL) {
               if (inheritsched_str[0] == 'e')
                   inheritsched = PTHREAD_EXPLICIT_SCHED;
               else if (inheritsched_str[0] == 'i')
                   inheritsched = PTHREAD_INHERIT_SCHED;
               else
                   usage(argv[0], "Value for -i must be 'e' or 'i'\n");

               s = pthread_attr_setinheritsched(&attr, inheritsched);
               if (s != 0)
                   handle_error_en(s, "pthread_attr_setinheritsched");
           }

           if (attr_sched_str != NULL) {
               if (!get_policy(attr_sched_str[0], &policy))
                   usage(argv[0], "Bad policy for 'attr' (-a)\n");
               param.sched_priority = strtol(&attr_sched_str[1], NULL, 0);

               s = pthread_attr_setschedpolicy(&attr, policy);
               if (s != 0)
                   handle_error_en(s, "pthread_attr_setschedpolicy");
               s = pthread_attr_setschedparam(&attr, &param);
               if (s != 0)
                   handle_error_en(s, "pthread_attr_setschedparam");
           }

           /* If we initialized a thread attributes object, display
              the scheduling attributes that were set in the object. */

           if (attrp != NULL) {
               s = pthread_attr_getschedparam(&attr, &param);
               if (s != 0)
                   handle_error_en(s, "pthread_attr_getschedparam");
               s = pthread_attr_getschedpolicy(&attr, &policy);
               if (s != 0)
                   handle_error_en(s, "pthread_attr_getschedpolicy");

               printf("Scheduler settings in 'attr'\n");
               display_sched_attr(policy, &param);

               pthread_attr_getinheritsched(&attr, &inheritsched);
               printf("    inheritsched is %s\n",
                      (inheritsched == PTHREAD_INHERIT_SCHED)  ? "INHERIT" :
                      (inheritsched == PTHREAD_EXPLICIT_SCHED) ? "EXPLICIT" :
                      "???");
               printf("\n");
           }

           /* Create a thread that will display its scheduling attributes. */

           s = pthread_create(&thread, attrp, &thread_start, NULL);
           if (s != 0)
               handle_error_en(s, "pthread_create");

           /* Destroy unneeded thread attributes object. */

           if (!use_null_attrib) {
             s = pthread_attr_destroy(&attr);
             if (s != 0)
                 handle_error_en(s, "pthread_attr_destroy");
           }

           s = pthread_join(thread, NULL);
           if (s != 0)
               handle_error_en(s, "pthread_join");

           exit(EXIT_SUCCESS);
       }

<?><?>. <?><?><?><?><?>
       getrlimit(2), sched_get_priority_min(2), pthread_attr_init(3),
       pthread_attr_setinheritsched(3), pthread_attr_setschedparam(3),
       pthread_attr_setschedpolicy(3), pthread_create(3), pthread_self(3),
       pthread_setschedprio(3), pthreads(7), sched(7)

<?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?> <?><?><?>
       <?><?><?><?><?><?> Alexey, Azamat Hackimov <azamat.hackimov@gmail.com>,
       kogamatranslator49 <r.podarov@yandex.ru>, Kogan, Max Is
       <ismax799@gmail.com>, Yuri Kozlov <yuray@komyakino.ru> <?> <?><?><?><?>
       <?><?><?><?><?><?> <pavia00@gmail.com>

       <?><?><?><?> <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?><?>;
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> GNU
       <?><?><?><?><?><?> 3 <https://www.gnu.org/licenses/gpl-3.0.html>
       <?><?><?> <?><?><?><?><?> <?><?><?><?><?><?><?>, <?><?><?><?><?>
       <?><?><?><?><?><?> <?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?>. <?><?> <?><?>
       <?><?><?><?><?> <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.

       <?><?><?><?> <?><?> <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?>
       <?> <?><?><?><?><?><?><?><?> <?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?>, <?><?><?><?><?><?><?><?><?><?>,
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?> <?><?> <man-pages-ru-talks@lists.sourceforge.net>.

Linux man-pages 6.06  31 <?><?><?><?><?><?><?> 2023 <?>.
                                                      pthread_setschedparam(3)