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* doc/lispref/files.texi (File Locks): Every platform supports locking now.

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Glenn Morris 2014-01-23 19:51:52 -08:00
parent ca5fd02c06
commit 0db19d3890
2 changed files with 8 additions and 9 deletions
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4
doc/lispref/ChangeLog
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@ -1,3 +1,7 @@
2014-01-24 Glenn Morris <rgm@gnu.org>
* files.texi (File Locks): Every platform supports locking now.
2014-01-22 Glenn Morris <rgm@gnu.org>
* display.texi (ImageMagick Images): Expand on image-format-suffixes.

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doc/lispref/files.texi
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@ -676,11 +676,12 @@ with-temp-buffer,, The Current Buffer}.
When two users edit the same file at the same time, they are likely
to interfere with each other. Emacs tries to prevent this situation
from arising by recording a @dfn{file lock} when a file is being
modified. (File locks are not implemented on Microsoft systems.)
modified.
Emacs can then detect the first attempt to modify a buffer visiting a
file that is locked by another Emacs job, and ask the user what to do.
The file lock is really a file, a symbolic link with a special name,
stored in the same directory as the file you are editing.
stored in the same directory as the file you are editing. (On file
systems that do not support symbolic links, a regular file is used.)
When you access files using NFS, there may be a small probability that
you and another user will both lock the same file ``simultaneously''.
@ -719,11 +720,6 @@ does nothing if the current buffer is not visiting a file, or if the
system does not support locking.
@end defun
File locking is not supported on some systems. On systems that do not
support it, the functions @code{lock-buffer}, @code{unlock-buffer} and
@code{file-locked-p} do nothing and return @code{nil}. It is also
possible to disable locking, by setting the variable @code{create-lockfiles}.
@defopt create-lockfiles
If this variable is @code{nil}, Emacs does not lock files.
@end defopt
@ -760,8 +756,7 @@ name of the user who has locked the file.
@end itemize
If you wish, you can replace the @code{ask-user-about-lock} function
with your own version that makes the decision in another way. The code
for its usual definition is in @file{userlock.el}.
with your own version that makes the decision in another way.
@end defun
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