mlockall(2)							System Calls Manual						       mlockall(2)

NAME

       mlockall() - lock a process virtual address space in memory

SYNOPSIS

DESCRIPTION

       The system call allows the calling process to lock its entire virtual address space into memory, making it immune to all routine swapping.

       flags may be one or both of the following:

	      Lock the current process virtual address space.
			       All addressable pages of the address space are locked.

	      Lock any future additions to the process virtual address space.

       Note that does not imply

       or  can	be  used  to  unlock all or a portion of the address space locked with A single call to removes all locks from the process virtual
       address space.  An call results in only the specified pages being unlocked.

       Regardless of how many times a process locks a page, a single or 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.

       Locks and applied with are not inherited by a child process.

       The user must have the privilege.

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

   Security Restrictions
       Some or all of the actions associated with this system call require the privilege.  Processes owned by the superuser have  this	privilege.
       Processes  owned  by  other users may have this privilege, depending on system configuration.  See privileges(5) for more information about
       privileged access on systems that support fine-grained privileges.

RETURN VALUE

       returns the following values:

	      Successful completion.
	      Failure.
		     The requested operation is not performed.	is set to indicate the error.

ERRORS

       If fails, is set to one of the following values:

	      The	   flags field did not contain either and/or

	      There is not enough lockable memory in the system
			   to satisfy the locking request.

	      The user does not have the
			   privilege.

EXAMPLES

       The following call to locks the entire process virtual address space in memory and ensures that any future additions to the  address  space
       will also be locked in memory:

SEE ALSO

       setprivgrp(1M), getprivgrp(2), mlock(2), munlock(2), munlockall(2), plock(2), privileges(5).

STANDARDS CONFORMANCE

																       mlockall(2)