uling parameter attributes in thread attributes object

       #include <pthread.h>

       int pthread_attr_setschedparam(pthread_attr_t *attr,
                                      const struct sched_param *param);
       int pthread_attr_getschedparam(pthread_attr_t *attr,
                                      struct sched_param *param);

       Compile and link with -pthread.

       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_setscheduler(2).

       In order for the parameter setting made by pthread_attr_setschedparam()
       to  have  effect  when  calling  pthread_create(3), the caller must use
       pthread_attr_setinheritsched(3) to set the inherit-scheduler  attribute
       of the attributes object attr to PTHREAD_EXPLICIT_SCHED.

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

       POSIX.1 documents EINVAL and ENOTSUP errors for  pthread_attr_setsched-
       param().   On  Linux  these  functions always succeed (but portable and
       future-proof applications should nevertheless handle a  possible  error


       See  pthread_attr_setschedpolicy(3) for a list of the thread scheduling
       policies supported on Linux.
       description of the project, and information about reporting bugs, can
       be found at

Linux                             2013-06-21     PTHREAD_ATTR_SETSCHEDPARAM(3)
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