线程属性（优先级）：pthread_attr_t

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

void* thread_proc(void* arg)
{
int policy;
struct sched_param param;

//
pthread_getschedparam(pthread_self(), &policy, ¶m);
printf("thread policy:%d, param.sched_priority:%d\n", policy, param.sched_priority);

return NULL;
}

int main(int argc, char*argv[])
{
pthread_t tid;

pthread_attr_t attr;

//
pthread_attr_init(&attr);

//
int inher = PTHREAD_EXPLICIT_SCHED;
pthread_attr_setinheritsched(&attr, inher);

//
int policy = SCHED_FIFO;
pthread_attr_setschedpolicy(&attr, policy);

//
struct sched_param param;
param.sched_priority = 30;
pthread_attr_setschedparam(&attr, ¶m);

pthread_create(&tid, &attr, thread_proc, NULL);
pthread_join(tid, NULL);

//
pthread_attr_destroy(&attr);

return 0;
}