wincache_lock

    (PECL wincache >= 1.1.0)

    wincache_lock — Acquires an exclusive lock on a given key

    Опис

    wincache_lock(string $key, bool $isglobal = false): bool

    Obtains an exclusive lock on a given key. The execution of the current script will be blocked until the lock can be obtained. Once the lock is obtained, the other scripts that try to request the lock by using the same key will be blocked, until the current script releases the lock by using wincache_unlock().

    Увага

    Using of the wincache_lock() and wincache_unlock() can cause deadlocks when executing PHP scripts in a multi-process environment like FastCGI. Do not use these functions unless you are absolutely sure you need to use them. For the majority of the operations on the user cache it is not necessary to use these functions.

    Параметри

    key

    Name of the key in the cache to get the lock on.

    isglobal

    Controls whether the scope of the lock is system-wide or local. Local locks are scoped to the application pool in IIS FastCGI case or to all php processes that have the same parent process identifier.

    Значення, що повертаються

    Повертає true у разі успіху або false в разі помилки.

    Приклади

    Приклад #1 Using wincache_lock()

    <?php
    $fp     = fopen("/tmp/lock.txt", "r+");
    if (    wincache_lock(“lock_txt_lock”)) { // do an exclusive lock
    ftruncate($fp, 0); // truncate file
    fwrite($fp, "Write something here\n");
    wincache_unlock(“lock_txt_lock”); // release the lock
    } else {
    echo     "Couldn't get the lock!";
    }
    fclose($fp);
    ?>

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    User Contributed Notes 2 notes

    up
    1
    PrisonDoom
    5 years ago
    The external link was off and the backslash "\" most of time are used for "scape character". Anyway, regards.
    up
    -1
    donraman at microsoft dot com
    14 years ago
    User should be aware that character '\' is not allowed as part of lock name. The reason why backslash is not allowed is because we are using CreateMutex call as described at http://msdn.microsoft.com/en-us/library/ms682411(VS.85).aspx. As per this article third parameter cannot have '\' character which is the lock name.

    This means below code will not work.

    <?php

    $ret_val     = wincache_lock("C:\WINDOWS\Temp/cache");
    echo     $ret_val . '<br>';
    $ret_val = wincache_unlock("C:\WINDOWS\Temp/cache");
    echo     $ret_val . '<br>';

    ?>
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