Waits for a read lock

# SyncReaderWriter::readlock

(PECL sync >= 1.0.0)

SyncReaderWriter::readlock — Waits for a read lock

### 説明

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

Obtains a read lock on a SyncReaderWriter object.

### パラメータ

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

### 戻り値

成功した場合に `true` を、失敗した場合に `false` を返します。

### 例

例1 SyncReaderWriter::readlock() example

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

### 参考

- SyncReaderWriter::readunlock() - Releases a read lock

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