c - Thread function timing -

when create thread automatically start thread function that's in parameter?

i'm using

iret1 =  pthread_create(&client[i++].tid, null, thread_function, null); printf("thread created");   //for testing purposes 

in thread function have print statement @ top. ex:

void *thread_function(void *arg){     printf("entered thread function");     ...     } 

instead of printing entered thread function prints thread created right after

and doesn't print entered thread function until start thread, there reason this?

you need @ least add newline \n @ end of every printf(3) format function, , call fflush(3), e.g. add call fflush(null); after each of 2 printf ...

don't forget <stdio.h> functions buffered. see setvbuf(3) function , man page.

the reason why output not printed want is staying in buffer of stdout.

and have no guarantee on output. individual characters might perhaps intermixed. read unlocked_stdio(3) , flockfile(3) details.

you may want read (several times) pthread tutorial...

ps consider using directly write(2) syscall (without using <stdio.h> function).