本文实例讲述了php进程(线程)通信基础之System V共享内存。分享给大家供大家参考,具体如下:
PHP默认情况没有开启功能,要支持该功能在编译PHP的时候要加入下面几个选项 System V消息,--enable-sysvmsg System V信号量支持,--enable-sysvsem System V共享内存支持,--enable-sysvshm
PHP还挺shmop共享内存,在编译的时候开启 --enable-shmop
System V共享内存的相关函数:
1: 创建信号量唯一标识符
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$ftok = ftok ( __FILE__ , 'a' );
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2: 创建共享内存端
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$id = shm_attach ( $ftok , 1000 , 0666 )
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3: 断开与共享内存段的连接
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shm_detach ( $id )
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4: 获取一个变量值
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$val = shm_get_var ( $id , $key )
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5: 检测变量是否存在
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shm_has_var ( $id , $key )
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6: 添加一个值到共享内存里
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shm_put_var ( $id , $key , $val )
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7: 从共享内存中删除一个变量
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shm_remove_var ( $id , $key )
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8: 从系统中删除共享内存
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shm_remove ( $id )
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<?php
$tmp = tempnam( __FILE__ , 'PHP' );
$key = ftok ( $tmp , 'a' );
$shmid = shm_attach( $key );
$counter = 0;
shm_put_var( $shmid , 1, $counter );
class CounterThread extends Thread {
public $shmid ;
public $is_runing = true;
public function __construct( $shmid ){
$this ->shmid = $shmid ;
}
public function run() {
$counter = shm_get_var( $this ->shmid, 1 );
$counter ++;
shm_put_var( $this ->shmid, 1, $counter );
printf( "Thread #%lu says: %s\n" , $this ->getThreadId(), $counter );
}
}
for ( $i =0; $i <10; $i ++){
$threads [] = new CounterThread( $shmid );
}
for ( $i =0; $i <10; $i ++){
$threads [ $i ]->start();
}
for ( $i =0; $i <10; $i ++){
$threads [ $i ]->join();
}
shm_remove( $shmid );
shm_detach( $shmid );
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希望本文所述对大家PHP程序设计有所帮助。
原文链接:https://www.cnblogs.com/zz-952/p/9766189.html