Hello,
I have trouble with fork() and setpriority().
When priority of child process != priority of parent process
and used SIGCHLD handler.
See example.
kernel 2.6.12.1, no SMP
--
Best regards, Roman
#include <sys/time.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
struct sigaction sa_chld;
int i = 0;
static void chld_handler (int signum) {
int status = 0;
wait (&status);
printf ("child closed: status = %i\n", status >> 8);
}
void test (void) {
pid_t pid = fork ();
if (pid == 0) {
setpriority (PRIO_PROCESS, 0, 0);
printf ("helo from child, i = %i\n", i);
exit (i);
}
}
int main () {
memset (&sa_chld, 0, sizeof (sa_chld));
sa_chld.sa_handler = &chld_handler;
sigaction (SIGCHLD, &sa_chld, NULL);
setpriority (PRIO_PROCESS, 0, -1);
while (1) {
i++;
test ();
sleep (3);
}
return 0;
}
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