==============================================================================
C Code for fork() creation test
==============================================================================
#include <stdio.h>
#include <stdlib.h>
#define NFORKS 50000
void do_nothing() {
int i;
i= 0;
}
int main(int argc, char *argv[])
{
int pid, j, status;
for (j=0; j<NFORKS; j++) {
/*** error handling ***/
if ((pid = fork()) < 0 ) {
printf ("fork failed with error code= %d\n", pid);
exit(0);
}
/*** this is the child of the fork ***/
else if (pid ==0) {
do_nothing();
exit(0);
}
/*** this is the parent of the fork ***/
else {
waitpid(pid, status, 0);
}
}
}
==============================================================================
C Code for pthread_create() test
==============================================================================
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#define NTHREADS 50000
void *do_nothing(void *null) {
int i;
i=0;
pthread_exit(NULL);
}
int main(int argc, char *argv[])
{
int rc, i, j, detachstate;
pthread_t tid;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
for (j=0; j<NTHREADS; j++) {
rc = pthread_create(&tid, &attr, do_nothing, NULL);
if (rc) {
printf("ERROR; return code from pthread_create() is %d\n", rc);
exit(-1);
}
/* Wait for the thread */
rc = pthread_join(tid, NULL);
if (rc) {
printf("ERROR; return code from pthread_join() is %d\n", rc);
exit(-1);
}
}
pthread_attr_destroy(&attr);
pthread_exit(NULL);
}
https://computing.llnl.gov/tutorials/pthreads/fork_vs_thread.txt
