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mlock(3C)


mlock -- lock pages in memory

Synopsis

   #include <sys/types.h>
   #include <sys/mman.h>
   

int mlock(void *addr, size_t len);

int munlock(void *addr, size_t 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.

Return values

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

References

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

Notices

Use of mlock and munlock requires that the user have appropriate privileges.
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004