create thread的时候发生core dump

 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <pthread.h>
 #define THREAD_COUNT 12

 void show_thread_policy(int threadno){
         int policy;
         struct sched_param param;
         pthread_getschedparam(pthread_self(), &policy, &param);
         switch(policy){
         case SCHED_OTHER:
                 printf("SCHED_OTHER %d\n", threadno);
                 break;
         case SCHED_RR:
                 printf("SCHED_RR %d\n", threadno);
                 break;
         case SCHED_FIFO:
                 printf("SCHED_FIFO %d\n", threadno);
                 break;
         default:
                 printf("UNKNOWN\n");
         }
 }

 void *thread(void *arg){
         int i,j;
         long threadno = (long)arg;
         printf("thread %d start \n", threadno);
         printf("thread ------------------------------0\n");
         sleep();
         printf("---------1---------------\n");
         show_thread_policy(threadno);
         printf("---------2---------------\n");
         for(int i=;i<;i++){
                 printf("---------3---------------\n");
                 for(j=;j<;j++){

                 }

                 printf("thread %d\n", threadno);
         }

         printf("thread %d exit\n", threadno);
         return NULL;
 }

 int main(int argc, char *argv[]){
         long i;
         pthread_attr_t attr[THREAD_COUNT];
         pthread_t pth[THREAD_COUNT];
         struct sched_param param;
         for(i=;i<THREAD_COUNT;++i){
                 pthread_attr_init(&attr[i]);
                 for(i=;i<THREAD_COUNT/;++i){
                         param.sched_priority = ;
                         pthread_attr_setschedpolicy(&attr[i], SCHED_FIFO);
                         pthread_attr_setschedparam(&attr[i], &param);
                         pthread_attr_setinheritsched(&attr[i], PTHREAD_EXPLICIT_SCHED);
                 }

                 for(i=THREAD_COUNT/;i<THREAD_COUNT;++i){
                         param.sched_priority = ;
                         pthread_attr_setschedpolicy(&attr[i], SCHED_FIFO);
                         pthread_attr_setschedparam(&attr[i], &param);
                         pthread_attr_setinheritsched(&attr[i], PTHREAD_EXPLICIT_SCHED);
                 }

                 for(i=;i<THREAD_COUNT;++i){
                         pthread_create(&pth[i], &attr[i], thread, (void *)i);
                         printf("--------------------create thread %d------------\n", i);
                 }

                 for(i=;i<THREAD_COUNT;++i){
                         pthread_join(pth[i], NULL);
                 }

                 for(i=;i<THREAD_COUNT;++i){
                         pthread_attr_destroy(&attr[i]);
                 }

                 return ;
         }
 }

编译之后执行的结果如下：

[root@Alston C++]# ./thread_2.exe
thread 0 start
thread ------------------------------0
--------------------create thread 0------------
--------------------create thread 1------------
--------------------create thread 2------------
--------------------create thread 3------------
Segmentation fault (core dumped)

目前还没调查出来原因。