mlockall(3C) — DG/UX 4.30



     mlockall(3C)               DG/UX 4.30                mlockall(3C)



     NAME
          mlockall, munlockall - lock or unlock address space

     SYNOPSIS
          #include <sys/mman.h>
          int mlockall(int flags);
          int munlockall(void);

     DESCRIPTION
          The function mlockall causes all pages mapped by an address
          space to be locked in memory.  The effect of mlockall(flags)
          is equivalent to:

               memcntl(0, 0, MCLOCKAS, flags, 0, 0)

          The value of flags determines whether the pages to be locked
          are those currently mapped by the address space, those that
          will be mapped in the future, or both:
                     MCLCURRENT   Lock current mappings
                     MCLFUTURE    Lock future mappings

          The function munlockall removes address space locks and
          locks on mappings in the address space.  The effect of
          munlockall is equivalent to:
               memcntl(0, 0, MCUNLOCKAS, 0, 0, 0)

          Locks established with mlockall are not inherited by a child
          process after a fork and are not nested.

     RETURN VALUE
          Upon successful completion, the functions mlockall and
          munlockall return a value of 0; otherwise, they return a
          value of -1 and set errno to indicate an error.

     ERRORS
          See memcntl(2).

     NOTES
          Use of mlockall and munlockall requires that the user have
          appropriate privileges.

     SEE ALSO
          fork(2), memcntl(2), mlock(3C), plock(2), sysconf(3C).












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