개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

VOP_LOCK(9)

VOP_LOCK(9)              BSD Kernel Developer's Manual             VOP_LOCK(9)

NAME
     VOP_LOCK, VOP_UNLOCK, VOP_ISLOCKED, vn_lock — serialize access to a vnode

SYNOPSIS
     #include <sys/param.h>
     #include <sys/lock.h>
     #include <sys/vnode.h>

     int
     VOP_LOCK(struct vnode *vp, int flags);

     int
     VOP_UNLOCK(struct vnode *vp, int flags);

     int
     VOP_ISLOCKED(struct vnode *vp);

     int
     vn_lock(struct vnode *vp, int flags);

DESCRIPTION
     These calls are used to serialize access to the file system, such as to
     prevent two writes to the same file from happening at the same time.

     The arguments are:

     vp     The vnode being locked or unlocked.

     flags  One of the lock request types:

                  LK_SHARED      Shared lock.
                  LK_EXCLUSIVE   Exclusive lock.
                  LK_UPGRADE     Shared-to-exclusive upgrade.
                  LK_DOWNGRADE   Exclusive-to-shared downgrade.
                  LK_RELEASE     Release any type of lock.
                  LK_DRAIN       Wait for all lock activity to end.

            The lock type may be or'ed with these lock flags:

                  LK_NOWAIT      Do not sleep to wait for lock.
                  LK_SLEEPFAIL   Sleep, then return failure.
                  LK_CANRECURSE  Allow recursive exclusive lock.
                  LK_NOWITNESS   Instruct witness(4) to ignore this instance.

            The lock type may be or'ed with these control flags:

                  LK_INTERLOCK   Specify when the caller already has a simple
                                 lock (VOP_LOCK() will unlock the simple lock
                                 after getting the lock).
                  LK_RETRY       Retry until locked.

            Kernel code should use vn_lock() to lock a vnode rather than call‐
            ing VOP_LOCK() directly.  vn_lock() also does not want a thread
            specified as argument but it assumes curthread to be used.

RETURN VALUES
     Zero is returned on success, otherwise an error is returned.

SEE ALSO
     vnode(9)

AUTHORS
     This manual page was written by Doug Rabson.

BSD                            February 25, 2008                           BSD