Re: GEMPAK 5.8.4 SpeedPatch runtime problems

Christian - can you try to reproduce the error with a minimal code
segment and post that?  A null second argument to nanosleep is supposed
to be permissible if you're not worried about continuing a sleep
following an interrupt...

On Fri, 2005-12-16 at 09:10 -0500, Christian Pagé wrote:

When using the latest GEMPAK 5.8.4 which I compiled (and which
includes the SpeedPatch), I get plenty of these errors:
nanosleep: Invalid argument

But the plot is ok though. But thousands of lines like this in the
terminal... Any idea why? I suspect that the NULL second argument is a

uname -a:
Linux 2.6.14-1.1637_FC4smp #1 SMP Wed Nov 9 19:21:28 EST 2005 x86_64
x86_64 x86_64 GNU/Linux

The source of GEMPAK using nanosleep:
./source/syslib/ccheck.c:                   ierr = nanosleep ( &fast, NULL );
./source/syslib/ccheck.c:                   ierr = nanosleep ( &slow, NULL );
./source/syslib/cnsleep.c: * This function is used by systems without
a nanosleep builtin.  It is       *
./source/syslib/cnsleep.c: * compiled to 'nanosleep' (interface as
given in time.h) using the   *
./source/gemlib/ss/cssleep.c:   *iret = nanosleep ( &rqtp, NULL );
./source/gemlib/ss/cssleep.c:       perror("nanosleep");

And finally the man page of nanosleep in my system:
NANOSLEEP(2)               Linux Programmer?s Manual              NANOSLEEP(2)

       nanosleep - pause execution for a specified time

       #include <time.h>

       int nanosleep(const struct timespec *req, struct timespec *rem);

       nanosleep  delays  the  execution of the program for at least
the time specified in *req.
       The function can return earlier if a signal has been delivered
to the  process.  In  this
       case,  it  returns -1, sets errno to EINTR, and writes the
remaining time into the struc-
       ture pointed to by rem unless rem is NULL.  The value of *rem
can then be  used  to  call
       nanosleep again and complete the specified pause.

       The structure timespec is used to specify intervals of time
with nanosecond precision. It
       is specified in <time.h> and has the form

              struct timespec
                      time_t  tv_sec;         /* seconds */
                      long    tv_nsec;        /* nanoseconds */

       The value of the nanoseconds field must be in the range 0 to 999 999 999.

       Compared to sleep(3) and usleep(3), nanosleep has the advantage
of not affecting any sig-
       nals, it is standardized by POSIX, it provides higher timing
resolution, and it allows to
       continue a sleep that has been interrupted by a signal more easily.

       In case of an error or exception, the nanosleep system call
returns -1 instead of  0  and
       sets errno to one of the following values:

       EINTR  The  pause  has been interrupted by a non-blocked signal
that was delivered to the
              process. The remaining sleep time has been written into
*rem so that  the  process
              can easily call nanosleep again and continue with the pause.

       EINVAL The value in the tv_nsec field was not in the range 0 to
999 999 999 or tv_sec was

       EFAULT Problem with copying information from user space.

The current implementation of nanosleep is based on the normal kernel timer mechanism,
       which  has  a  resolution  of  1/HZ s (i.e, 10 ms on Linux/i386
and 1 ms on Linux/Alpha).
       Therefore, nanosleep pauses always for at least the specified
time, however it  can  take
       up  to 10 ms longer than specified until the process becomes
runnable again. For the same
       reason, the value returned in case of a delivered signal in
*rem is  usually  rounded  to
       the next larger multiple of 1/HZ s.

       As  some  applications  require  much more precise pauses
(e.g., in order to control some
       time-critical hardware), nanosleep is also capable of short
high-precision pauses. If the
       process is scheduled under a real-time policy like SCHED_FIFO
or SCHED_RR, then pauses of
       up to 2 ms will be performed as busy waits with microsecond precision.

       POSIX.1b (formerly POSIX.4).

       sleep(3), usleep(3), sched_setscheduler(2), timer_create(2)

Linux 1.3.85                      1996-04-10                      NANOSLEEP(2)

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