pthread_attr_setschedparam(3) - Linux manual page (original) (raw)

pthreada...chedparam(3) Library Functions Manual_pthreada...chedparam_(3)

NAME top

   pthread_attr_setschedparam, pthread_attr_getschedparam - set/get
   scheduling parameter attributes in thread attributes object

LIBRARY top

   POSIX threads library (_libpthread_, _-lpthread_)

SYNOPSIS top

   **#include <pthread.h>**

   **int pthread_attr_setschedparam(pthread_attr_t *restrict** _attr_**,**
                                 **const struct sched_param *restrict** _param_**);**
   **int pthread_attr_getschedparam(const pthread_attr_t *restrict** _attr_**,**
                                 **struct sched_param *restrict** _param_**);**

DESCRIPTION top

   The **pthread_attr_setschedparam**() function sets the scheduling
   parameter attributes of the thread attributes object referred to
   by _attr_ to the values specified in the buffer pointed to by _param_.
   These attributes determine the scheduling parameters of a thread
   created using the thread attributes object _attr_.

   The **pthread_attr_getschedparam**() returns the scheduling parameter
   attributes of the thread attributes object _attr_ in the buffer
   pointed to by _param_.

   Scheduling parameters are maintained in the following structure:

       struct sched_param {
           int sched_priority;     /* Scheduling priority */
       };

   As can be seen, only one scheduling parameter is supported.  For
   details of the permitted ranges for scheduling priorities in each
   scheduling policy, see [sched(7)](../man7/sched.7.html).

   In order for the parameter setting made by
   **pthread_attr_setschedparam**() to have effect when calling
   [pthread_create(3)](../man3/pthread%5Fcreate.3.html), the caller must use
   [pthread_attr_setinheritsched(3)](../man3/pthread%5Fattr%5Fsetinheritsched.3.html) to set the inherit-scheduler
   attribute of the attributes object _attr_ to **PTHREAD_EXPLICIT_SCHED**.

RETURN VALUE top

   On success, these functions return 0; on error, they return a
   nonzero error number.

ERRORS top

   **pthread_attr_setschedparam**() can fail with the following error:

   **EINVAL** The priority specified in _param_ does not make sense for the
          current scheduling policy of _attr_.

   POSIX.1 also documents an **ENOTSUP** error for
   **pthread_attr_setschedparam**().  This value is never returned on
   Linux (but portable and future-proof applications should
   nevertheless handle this error return value).

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────────────────────────────┼───────────────┼─────────┤
   │ **pthread_attr_setschedparam**(),        │ Thread safety │ MT-Safe │
   │ **pthread_attr_getschedparam**()         │               │         │
   └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

   POSIX.1-2008.

HISTORY top

   POSIX.1-2001.  glibc 2.0.

NOTES top

   See [pthread_attr_setschedpolicy(3)](../man3/pthread%5Fattr%5Fsetschedpolicy.3.html) for a list of the thread
   scheduling policies supported on Linux.

EXAMPLES top

   See [pthread_setschedparam(3)](../man3/pthread%5Fsetschedparam.3.html).

SEE ALSO top

   [sched_get_priority_min(2)](../man2/sched%5Fget%5Fpriority%5Fmin.2.html), [pthread_attr_init(3)](../man3/pthread%5Fattr%5Finit.3.html),
   [pthread_attr_setinheritsched(3)](../man3/pthread%5Fattr%5Fsetinheritsched.3.html), [pthread_attr_setschedpolicy(3)](../man3/pthread%5Fattr%5Fsetschedpolicy.3.html),
   [pthread_create(3)](../man3/pthread%5Fcreate.3.html), [pthread_setschedparam(3)](../man3/pthread%5Fsetschedparam.3.html),
   [pthread_setschedprio(3)](../man3/pthread%5Fsetschedprio.3.html), [pthreads(7)](../man7/pthreads.7.html), [sched(7)](../man7/sched.7.html)

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Linux man-pages 6.10 2024-07-23 pthreada...chedparam(3)

Pages that refer to this page:pthread_attr_init(3), pthread_attr_setinheritsched(3), pthread_attr_setschedpolicy(3), pthread_attr_setscope(3), pthread_getattr_default_np(3), pthread_getattr_np(3), pthread_setschedparam(3), pthread_setschedprio(3)