// Timers.cpp,v 1.2 2004/01/09 21:59:06 shuston Exp #include "ace/config.h" #if !defined (ACE_LACKS_FORK) #include "ace/streams.h" #include <signal.h> #include <sys/types.h> #include <unistd.h> #include <time.h> typedef void (*timerTask_t)(void); // Listing 1 code/ch07 pid_t timerTask (int initialDelay, int interval, timerTask_t task) { if (initialDelay < 1 && interval < 1) return -1; pid_t pid = fork (); if (pid < 0) return -1; if (pid > 0) return pid; if (initialDelay > 0) sleep (initialDelay); if (interval < 1) return 0; while (1) { (*task) (); sleep (interval); } ACE_NOTREACHED (return 0); } // Listing 1 // Listing 2 code/ch07 void foo () { time_t now = time (0); cerr << "The time is " << ctime (&now) << endl; } // Listing 2 void programMainLoop (void) { sleep (30); } // Listing 3 code/ch07 int main (int, char *[]) { pid_t timerId = timerTask (3, 5, foo); programMainLoop (); kill (timerId, SIGINT); return 0; } // Listing 3 #else #include <stdio.h> int main (int, char *[]) { puts ("This very unportable example requires fork().\n"); return 0; } #endif /* ACE_LACKS_FORK */