A problem with linux threads

Hi, I am new to linux and was writing a program that uses linux POSIX
Threads. I had to show some activity on the screen while some files
will be copied in the background. I thought of implementing it using
threads and to just test the algorithm I wrote the following,

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

int running=1;
char *signs[]={"|","/","-","\\"};
int cur_sign=0;

void* run(void* args){
while(running){
printf("%s",sig ns[cur_sign]);
fflush(stdin);

(cur_sign==3)? cur_sign=0 : cur_sign++;
sleep(1);
printf("\b");
}
return NULL;
}

int main(void){
pthread_t t;
pthread_create( &t,NULL,run,NUL L);
sleep(10);
running=0;
return 0;
}

The problem with this is, it simply doesn't show the signs in the
repeating printf statements in run function, it waits for 10 secs and
then displays the last printf result and ends. While the same logic
works fine with Java threads, what is going on here? Another thing,
when I add a \n to the printf statement in the loop
[printf("%s\n",s igns[cur_sign]);], it starts printing them in the right
way but in separate lines (that is expected), but what happens in the
first case?

>
Hi, I am new to linux and was writing a program that uses linux POSIX
Threads. I had to show some activity on the screen while some files
will be copied in the background. I thought of implementing it using
threads and to just test the algorithm I wrote the following,

printf("%s",sig ns[cur_sign]);
fflush(stdin);

Sourav wrote:

Hi, I am new to linux and was writing a program that uses linux POSIX
Threads. I had to show some activity on the screen while some files
will be copied in the background. I thought of implementing it using
threads and to just test the algorithm I wrote the following,

Threads are OT here, but perhaps your problem isn't really related to
threads.

[...]

printf("%s",sig ns[cur_sign]);
fflush(stdin);

[...]

Flushing input streams is undefined. Did you perhaps mean to flush
stdout, to force the output to be sent?

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

Try printf("\n") before printf("%s") it is posible tha the bash colon
is overwriting yor output to stdout