HP 3000 Manuals

DCE for the HP 3000

Reentrant Interfaces 

Many /lib/libc.a (POSIX C Library) routines return pointers to internal
static data.  This causes problems in a multithreaded program; while one
thread tries to access the data another thread could be modifying it in
some way.

The following are interfaces that should be called by multithreaded
programs.  These versions of the interfaces are different from the
original versions.

The reentrant definitions currently defined in /lib/libc.a are:

     opendir_r       readdir_r       getgrgid_r      getgrnam_r
     getpwnam_r      getwpuid_r      getlogin_r

In addition, the following are provided as part of /usr/lib/libdce.a on
the HP 3000:

     asctime_r       crypt_r         ctime_r         ecvt_r
     fcvt_r          gmtime_r        l64a_r          localtime_r

There are four reentrant routines that are not defined in the
DCE/3000 header files.  To use them, add the following lines to the
/usr/include/time.h file, just before the last line (#endif /*
_TIME_INCLUDED */).  For example,

     #  ifdef _REENTRANT
           extern int asctime_r(const struct tm *, char *, int);
           extern int ctime_r(const time_t *, char *, int);
           extern int gmtime_r(const time_t *, struct tm *);
           extern int localtime_r(const time_t *, struct tm *);
     #  endif /* _REENTRANT */

MPE/iX 5.0 Express III Documentation