Actual source code: psleep.c

      1: #define PETSC_DESIRE_FEATURE_TEST_MACROS /* for usleep()  */
      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: @*/
     27: PetscErrorCode PetscSleep(PetscReal s)
     28: {
     29:   if (s < 0) getc(stdin);

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

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