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| author | Nathan Guse <nathaniel.guse@gmail.com> | 2013-07-23 11:13:25 -0500 |
|---|---|---|
| committer | Nathan Guse <nathaniel.guse@gmail.com> | 2013-07-23 11:13:25 -0500 |
| commit | 485c6ab3553f518b157610ee1144bbcbef63f797 (patch) | |
| tree | 0c50392c4716511e118eeabd3f48cceb3ac7e906 /phpBB/phpbb/lock/flock.php | |
| parent | 41d8bfa974900c9befbde06cc08060eb8a552ec8 (diff) | |
| parent | be59885d5fd4b44f1c43994dec928eda816f9ab8 (diff) | |
| download | forums-485c6ab3553f518b157610ee1144bbcbef63f797.tar forums-485c6ab3553f518b157610ee1144bbcbef63f797.tar.gz forums-485c6ab3553f518b157610ee1144bbcbef63f797.tar.bz2 forums-485c6ab3553f518b157610ee1144bbcbef63f797.tar.xz forums-485c6ab3553f518b157610ee1144bbcbef63f797.zip | |
Merge branch 'develop' of github.com:phpbb/phpbb3 into ticket/11667
# By Joas Schilling (224) and others
# Via Andreas Fischer (23) and others
* 'develop' of github.com:phpbb/phpbb3: (385 commits)
[ticket/11734] Readd accidently removed language strings of forum permissions
[ticket/11620] Whitespace and combine function into test_case
[ticket/11620] Move check_ban_test functions to setUp/tearDown for clarity
[ticket/11620] Changed incorrect global variable
[ticket/11620] Minor indentation changes and comment clarity
[ticket/11733] Fix "Illegal offset type" Warning caused by overall feed
[ticket/11733] Add browse test for feed.php
[ticket/11731] Remove static calls to captcha garbage collector
[ticket/11728] Replace topic_approved with topic_visibility
[ticket/11620] Expected and actual test conditions wrongly swapped
[ticket/11620] Space between . in directory import concatenation
[ticket/11620] Changes to match merge
[ticket/11620] Changes for code guidelines consistency
[ticket/11620] Fix a static calls to non-static for session captcha
[ticket/11620] Cleanup creation_test that was renamed on a cherry-pick
[ticket/11620] Update auth_provider for new interface
[ticket/11620] Added garbage_collection_test
[ticket/11620] Fixed check_ban_test errors with cache and ban warning message
[ticket/11620] Fixed a typo on check_ban_test
[ticket/11620] Refactored check_isvalid_test to use session_test_case
...
Diffstat (limited to 'phpBB/phpbb/lock/flock.php')
| -rw-r--r-- | phpBB/phpbb/lock/flock.php | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/phpBB/phpbb/lock/flock.php b/phpBB/phpbb/lock/flock.php new file mode 100644 index 0000000000..17de0847c0 --- /dev/null +++ b/phpBB/phpbb/lock/flock.php @@ -0,0 +1,144 @@ +<?php +/** +* +* @package phpBB3 +* @copyright (c) 2012 phpBB Group +* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2 +* +*/ + +/** +* @ignore +*/ +if (!defined('IN_PHPBB')) +{ + exit; +} + +/** +* File locking class +* @package phpBB3 +*/ +class phpbb_lock_flock +{ + /** + * Path to the file to which access is controlled + * + * @var string + */ + private $path; + + /** + * File pointer for the lock file + * @var string + */ + private $lock_fp; + + /** + * Constructor. + * + * You have to call acquire() to actually acquire the lock. + * + * @param string $path Path to the file to which access is controlled + */ + public function __construct($path) + { + $this->path = $path; + $this->lock_fp = null; + } + + /** + * Tries to acquire the lock. + * + * If the lock is already held by another process, this call will block + * until the other process releases the lock. If a lock is acquired and + * is not released before script finishes but the process continues to + * live (apache/fastcgi) then subsequent processes trying to acquire + * the same lock will be blocked forever. + * + * If the lock is already held by the same process via another instance + * of this class, this call will block forever. + * + * If flock function is disabled in php or fails to work, lock + * acquisition will fail and false will be returned. + * + * @return bool true if lock was acquired + * false otherwise + */ + public function acquire() + { + if ($this->lock_fp) + { + return false; + } + + // For systems that can't have two processes opening + // one file for writing simultaneously + if (file_exists($this->path . '.lock')) + { + $mode = 'rb'; + } + else + { + $mode = 'wb'; + } + + $this->lock_fp = @fopen($this->path . '.lock', $mode); + + if ($mode == 'wb') + { + if (!$this->lock_fp) + { + // Two processes may attempt to create lock file at the same time. + // Have the losing process try opening the lock file again for reading + // on the assumption that the winning process created it + $mode = 'rb'; + $this->lock_fp = @fopen($this->path . '.lock', $mode); + } + else + { + // Only need to set mode when the lock file is written + @chmod($this->path . '.lock', 0666); + } + } + + if ($this->lock_fp) + { + @flock($this->lock_fp, LOCK_EX); + } + + return (bool) $this->lock_fp; + } + + /** + * Does this process own the lock? + * + * @return bool true if lock is owned + * false otherwise + */ + public function owns_lock() + { + return (bool) $this->lock_fp; + } + + /** + * Releases the lock. + * + * The lock must have been previously obtained, that is, acquire() call + * was issued and returned true. + * + * Note: Attempting to release a lock that is already released, + * that is, calling release() multiple times, is harmless. + * + * @return null + */ + public function release() + { + if ($this->lock_fp) + { + @flock($this->lock_fp, LOCK_UN); + fclose($this->lock_fp); + $this->lock_fp = null; + } + } +} |