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MUNLOCK(2) Linux Programmer's Manual MUNLOCK(2)
munlock - reenable paging for some parts of memory
int munlock(const void *addr, size_t len);
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
On POSIX systems on which mlock and munlock are available, _POSIX_MEMLOCK_RANGE is defined
in <unistd.h> and the value PAGESIZE from <limits.h> indicates the number of bytes per
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.
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.
mlock(2), mlockall(2), munlockall(2)
Linux 1.3.43 1995-11-26 MUNLOCK(2)
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