#include <pthread.h>
#include <sched.h>
int pthread_attr_setinheritsched(pthread_attr_t *attr,
                                 int *inheritsched);
Threadsafe: Yes
Signal Safe: Yes

The pthread_attr_setinheritsched() function sets the inheritsched attribute in the thread attributes object specified. The inheritsched attribute should be one of PTHREAD_EXPLICIT_SCHED or PTHREAD_INHERIT_SCHED. The default inheritsched attribute is PTHREAD_EXPLICIT_SCHED, with a default priority of 0.

Use the inheritsched attribute to inherit or explicitly specify the scheduling attributes when creating new threads.

Parameters

attr

(Input) Address of thread creation attributes

inheritsched

(Output) Address of variable to receive the inheritsched attribute

None.

Return Value

0

pthread_attr_setinheritsched() was successful.

value

pthread_attr_setinheritsched() was not successful. value is set to indicate the error condition.

If pthread_attr_setinheritsched() was not successful, the error condition returned usually indicates one of the following errors. Under some conditions, the value returned could indicate an error other than those listed here.

[EINVAL]

The value specified for the argument is not correct.

• The <pthread.h> header file. See Header files for Pthread functions
• pthread_attr_getinheritsched()--Get Thread Attribute Object Inherit Scheduling Attributes
• pthread_attr_getschedparam()--Get Thread Attributes Object Scheduling Parameters

#define _MULTI_THREADED
#include <pthread.h>
#include <stdio.h>
#include <except.h>
#include "check.h"

void showInheritSched(pthread_attr_t *attr) {
  int rc;
  int inheritsched;
  rc = pthread_attr_getinheritsched(attr, &inheritsched);
  checkResults("pthread_attr_getinheritsched()\n", rc);
  
  switch(inheritsched) {
  case PTHREAD_EXPLICIT_SCHED:
    printf("Inherit Sched - PTHREAD_EXPLICIT_SCHED\n");
    break;
  case PTHREAD_INHERIT_SCHED:
    printf("Inherit Sched - PTHREAD_INHERIT_SCHED\n");
    break;
  default:
    printf("Invalid inheritsched attribute!\n");
    exit(1);
  }
  return;                                         
}

int main(int argc, char **argv)
{
  pthread_t             thread;
  int                   rc=0;
  pthread_attr_t        attr;
  char                  c;
  void                 *status;

  printf("Enter Testcase - %s\n", argv[0]);

  rc = pthread_attr_init(&attr);
  checkResults("pthread_attr_init()\n", rc);

  showInheritSched(&attr);
  
  rc = pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED);
  checkResults("pthread_attr_setinheritsched()\n", rc);
  
  showInheritSched(&attr);

  rc = pthread_attr_destroy(&attr);
  checkResults("pthread_attr_destroy()\n", rc);
  
  printf("Main completed\n");
  return 0;
}

Enter Testcase - QP0WTEST/TPSIS0
Inherit Sched - PTHREAD_EXPLICIT_SCHED
Inherit Sched - PTHREAD_INHERIT_SCHED
Main completed