I would like to ask that PrintHello accepts a void pointer but how come you can equate it to an integer directly ???
" tid = (int)threadid; "
while at the same time instead if a pointer a normal variable was passed into this function
" pthread_create(&threads[t], NULL, PrintHello, (void *)t); "
the above construct is taken from
https://computing.llnl.gov/tutorials/pthreads/#PassingArguments
#include <pthread.h>
#include <stdio.h>
#define NUM_THREADS 5
void *PrintHello(void *threadid)
{
int tid;
tid = (int)threadid;
printf("Hello World! It's me, thread #%d!\n", tid);
pthread_exit(NULL);
}
int main (int argc, char *argv[])
{
pthread_t threads[NUM_THREADS];
int rc, t;
for(t=0; t<NUM_THREADS; t++){
printf("In main: creating thread %d\n", t);
rc = pthread_create(&threads[t], NULL, PrintHello, (void *)t);
if (rc){
printf("ERROR; return code from pthread_create() is %d\n", rc);
exit(-1);
}
}
pthread_exit(NULL);
}