PHP Multi-process Pcntl Learning (ii)

Data is independent in multiple processes, variables cannot be shared, so you can use SHMOP Shared memory implementations (CLI mode does not support APC extensions), or it is stored in a nosql such as Redis.

The following example, open 10 processes combined with Redis collection, do some simple task processing.

1<?PHP2  for($i= 0;$i<10;$i++){//Open 10 Processes3     $ret= Pcntl_fork ();//Build Process4 5     if($ret= = 0){6 7         $redis=NewRedis ();8         $redis->connect (' 127.0.0.1 ', 6379);9 Ten          while(true){//Make a loop and let the process run again and again One  A             if($redis->setnx (' job ', 1) ==1) {//Locking -  -                 if(Count($redis->keys (' webpub ')) = = 0) {//no data in the collection goes out of the loop the                     $redis->del (' job ');//Unlock -                     Continue; -                 } -  +                 $getjob=$redis->zrange (' Webpub ', 0,0);//Take out a -                 Var_dump($getjob); +                 //Open Transaction A                 $redis-multi (); at  -                 //ordered collection Delete -                 $redis->zrem (' Webpub ',$getjob[0]);//Delete -                 $redis->del (' job ');//Unlock -  - //Execute transaction code in                 $redis-exec(); -  to                 //the following represent the tasks to be performed +                 file_put_contents('./job/').$getjob[0]. '. HTML ',$getjob[0]); -  the                 Echo $getjob[0]. ' is do '.Php_eol; *  $                 Sleep(1);Panax Notoginseng             } -         } the     } +}

The above code opens 10 processes to handle the tasks in the Webpub collection in Redis, where the task is relatively simple to generate a file. It is important to note that in order to prevent a task from being processed concurrently between multiple processes, a lock must be added to limit it.

PS: Do not know the above code whether there is a pit, like me wild yards involved in a bit of deep things may appear a variety of pits.

PHP Multi-process Pcntl Learning (ii)