MLOCK(3C-SVR4)      RISC/os Reference Manual       MLOCK(3C-SVR4)



NAME
     mlock, munlock - lock (or unlock) pages in memory

SYNOPSIS
     #include <sys/types.h>

     int mlock(caddrt addr, sizet len);
     int munlock(caddrt addr, sizet len);

DESCRIPTION
     The function mlock uses the mappings established for the
     address range [addr, addr + len) to identify pages to be
     locked in memory.  The effect of mlock(addr, len) is
     equivalent to:

          memcntl(addr, len, MC_LOCK, 0, 0, 0).

     munlock removes locks established with mlock.  The effect of
     munlock(addr, len) is equivalent to:

          memcntl(addr, len, MC_UNLOCK, 0, 0, 0).

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

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

DIAGNOSTICS
     Upon successful completion, the functions mlock and  munlock
     return  0;  otherwise, they return -1 and set errno to indi-
     cate the error.

NOTES
     Use of  mlock  and  munlock  requires  that  the  user  have
     appropriate privileges.


















                        Printed 11/19/92                   Page 1