Waits for an exclusive write lock

# SyncReaderWriter::writelock

(PECL sync >= 1.0.0)

SyncReaderWriter::writelock — Waits for an exclusive write lock

### 说明

public function SyncReaderWriter::writelock(int `$wait` = -1): bool

Obtains an exclusive write lock on a SyncReaderWriter object.

### 参数

`wait`
  The number of milliseconds to wait for a lock. A value of -1 is infinite.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 示例

示例 #1 SyncReaderWriter::writelock() example

    <?php
    $readwrite = new SyncReaderWriter("FileCacheLock");
    $readwrite->writelock();
    /* ... */
    $readwrite->writeunlock();
    ?>

### 参见

- SyncReaderWriter::writeunlock() - Releases a write lock

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