mlockall(3C)         COMPATIBILITY FUNCTIONS         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 mun-
     lockall 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.

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

DIAGNOSTICS
     Upon successful completion, the functions mlockall and  mun-
     lockall return 0; otherwise, they return -1 and set errno to
     indicate the error.

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















                          Last change:                          1