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NAME    [Toc]    [Back]

       munlock - reenable paging for some parts of memory

SYNOPSIS    [Toc]    [Back]

       #include <sys/mman.h>

       int munlock(const void *addr, size_t len);

DESCRIPTION    [Toc]    [Back]

       munlock	reenables  paging for the memory in the range starting at addr
       with length len bytes. All pages which contain a part of the  specified
       memory  range can after calling munlock be moved to external swap space
       again by the kernel.

       Memory locks do not stack, i.e., pages which have been  locked  several
       times  by  calls to mlock or mlockall will be unlocked by a single call
       to munlock for the corresponding range or by munlockall.   Pages  which
       are  mapped  to	several  locations or by several processes stay locked
       into RAM as long as they are locked at least at one location or	by  at
       least one process.

       On  POSIX systems on which mlock and munlock are available, _POSIX_MEM-
       LOCK_RANGE is defined in <unistd.h> and the value PAGESIZE  from  <limits.h>
 indicates the number of bytes per page.

RETURN VALUE    [Toc]    [Back]

       On  success,  munlock returns zero.  On error, -1 is returned, errno is
       set appropriately, and no changes are made to any locks in the  address
       space of the process.

ERRORS    [Toc]    [Back]

       ENOMEM Some  of	the  specified	address  range	does not correspond to
	      mapped pages in the address space of the process.

       EINVAL len was not a positive number.

CONFORMING TO    [Toc]    [Back]

       POSIX.1b, SVr4

SEE ALSO    [Toc]    [Back]

       mlock(2), mlockall(2), munlockall(2)

Linux 1.3.43			  1995-11-26			    MUNLOCK(2)
[ Back ]
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