From ec3c6d647c3eed056dff01d7493dd74ea7a56299 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 24 Feb 2009 17:18:55 +0000
Subject: rdoc update.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@22607 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 file.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

(limited to 'file.c')

diff --git a/file.c b/file.c
index 7b4303acd..0e3a2d209 100644
--- a/file.c
+++ b/file.c
@@ -3499,15 +3499,18 @@ rb_thread_flock(void *data)
  *
  *  Example:
  *
- *     # write lock
+ *     # update a counter using write lock
  *     # don't use "w" because it truncates the file before lock.
- *     File.open("testfile", File::WRONLY|File::CREAT, 0644) {|f|
+ *     File.open("counter", File::RDWR|File::CREAT, 0644) {|f|
  *       f.flock(File::LOCK_EX)
- *       f.truncate(0)
- *       f.write "new content"
+ *       value = f.read.to_i + 1
+ *       f.rewind
+ *       f.write("#{value}\n")
+ *       f.flush
+ *       f.truncate(f.pos)
  *     }
  *
- *     # read lock
+ *     # read the counter using read lock
  *     File.open("testfile", "r") {|f|
  *       f.flock(File::LOCK_SH)
  *       p f.read
-- 
cgit