munlockall(2)                                                 munlockall(2)




 NAME    [Toc]    [Back]
      munlockall() - unlock the entire virtual address space of a process

 SYNOPSIS    [Toc]    [Back]
      #include <sys/mman.h>

      int munlockall() ;

 DESCRIPTION    [Toc]    [Back]
      The munlockall() system call allows the calling process to unlock any
      portions of its virtual address space that have previously been locked
      into memory with mlock() or mlockall(), including any portions locked
      due to the MCL_FUTURE option of mlockall().  Upon successful
      completion of the munlockall(), all pages within the process virtual
      address space are subject to routine paging and/or swapping and the
      MCL_FUTURE option will no longer be in effect for the process.

      Regardless of how many times a process locks a page, a single
      munlockall() will unlock it.  When memory is shared by multiple
      processes and mlocks are applied to the same physical page by multiple
      processes, a page remains locked until the last lock is removed from
      that page.

      The effective user ID of the calling process must be a superuser or
      the user must be a member of a group that has the MLOCK privilege (see
      getprivgrp(2) and setprivgrp(1M)).

      Although plock() and the mlock() family of functions may be used
      together in an application, each may affect the other in unexpected
      ways.  This practice is not recommended.

 RETURN VALUE    [Toc]    [Back]
      munlockall() returns the following values:

            0   Successful completion.
           -1   Failure.  The requested operation is not performed.  errno
                is set to indicate the error.

 ERRORS    [Toc]    [Back]
      If munlockall() fails, errno is set to the following value:

           [EPERM]        The effective user ID of the calling process is
                          not a superuser and the user does not belong to a
                          group that has the MLOCK privilege.

 EXAMPLES    [Toc]    [Back]
      The following call to munlockall() unlocks the process virtual address
      space:

           munlockall();




 Hewlett-Packard Company            - 1 -   HP-UX 11i Version 2: August 2003






 munlockall(2)                                                 munlockall(2)




 SEE ALSO    [Toc]    [Back]
      setprivgrp(1M), getprivgrp(2), mlock(2), mlockall(2), munlock(2),
      plock(2).

 STANDARDS CONFORMANCE    [Toc]    [Back]
      munlockall(): POSIX Realtime Extensions, IEEE Std 1003.1b


 Hewlett-Packard Company            - 2 -   HP-UX 11i Version 2: August 2003