2:  #include <petscsys.h>
  3: #if defined(PETSC_HAVE_UNISTD_H)
  4: #include <unistd.h>
  5: #endif
  6: #if defined(PETSC_HAVE_DOS_H)    /* borland */
  7: #include <dos.h>
  8: #endif
  9: #if defined(PETSC_HAVE_TIME_H)
 10: #include <time.h>
 11: #endif

 13: /*@
 14:    PetscSleep - Sleeps some number of seconds.

 16:    Not Collective

 18:    Input Parameters:
 19: .  s - number of seconds to sleep

 21:    Notes:
 22:       If s is negative waits for keyboard input

 24:    Level: intermediate

 26:    Concepts: sleeping
 27:    Concepts: pause
 28:    Concepts: waiting

 30: @*/
 31: PetscErrorCode  PetscSleep(PetscReal s)
 32: {
 34:   if (s < 0) getc(stdin);

 36:   /* Some systems consider it an error to call nanosleep or usleep for more than one second so we only use them for subsecond sleeps. */
 37: #if defined(PETSC_HAVE_NANOSLEEP)
 38:   else if (s < 1) {
 39:     struct timespec rq;
 40:     rq.tv_sec  = 0;
 41:     rq.tv_nsec = (long)(s*1e9);
 42:     nanosleep(&rq,0);
 43:   }
 44: #elif defined(PETSC_HAVE_USLEEP)
 45:   /* POSIX.1-2001 deprecates this in favor of nanosleep because nanosleep defines interaction with signals */
 46:   else if (s < 1) usleep((unsigned int)(s*1e6));
 47: #endif

 49: #if defined(PETSC_HAVE_SLEEP)
 50:   else sleep((int)s);
 51: #elif defined(PETSC_HAVE__SLEEP) && defined(PETSC_HAVE__SLEEP_MILISEC)
 52:   else _sleep((int)(s*1000));
 53: #elif defined(PETSC_HAVE__SLEEP)
 54:   else _sleep((int)s);
 55: #else
 56:   SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS,"No support for sleep() on this machine");
 57: #endif
 58:   return(0);
 59: }