#define _GNU_SOURCE
#include<pthread.h>
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include <unistd.h>
#include<errno.h>
void display_thread_attr(pthread_attr_t *attr) {
int ret, a;
ret = pthread_attr_getinheritsched(attr, &a);
if (ret != 0) {
printf("pthread_attr_getinheritsched error \n");
return;
}
printf("Inherit scheduler = %s\n",
(a == PTHREAD_INHERIT_SCHED) ? "PTHREAD_INHERIT_SCHED" :
(a == PTHREAD_EXPLICIT_SCHED) ? "PTHREAD_EXPLICIT_SCHED" :
"???");
}
static void *threadfun(void *arg)
{
pthread_attr_t gattr;
int ret;
char *s=(char *)arg;
ret = pthread_getattr_np(pthread_self(), &gattr);
if (ret != 0) {
printf("pthread_getattr_np error \n");
return (void *)-1;
}
display_thread_attr(&gattr);
}
int main()
{
pthread_t th;
pthread_attr_t attr;
int ret;
ret = pthread_attr_init(&attr);
if (ret != 0) {
printf("Pthread attribute init error\n");
return -1;
}
ret = pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED);
if (ret != 0) {
printf("Pthread attribute inherit sched error %s\n", strerror(errno));
return -1;
}
ret = pthread_create(&th,&attr,&threadfun,NULL);
if (ret != 0) {
printf("pthread create error\n");
return -1;
}
ret = pthread_attr_destroy(&attr);
if (ret != 0) {
printf("pthread attr destroy error\n");
return -1;
}
ret = pthread_join(th, NULL);
if (ret != 0) {
printf("pthread_join error \n");
return -1;
}
return 0;
}
