mysql - 关于开启PHP多进程与它们之间的通信问题
我们通常在Linux上调用PHP来执行定时任务,如
php -f xxx.php,有时候需要先有一个PHP父进程,然后开启多个PHP子进程来做同一件事...
如果这时候当其中一个子进程结束或出现问题时通知父进程,父进程就可以做一些事,如关闭其它正在运行的进程等等吧....
想了解一下大家在此类问题上是怎么实现或处理的?
回复内容：
我们通常在Linux上调用PHP来执行定时任务,如
php -f xxx.php,有时候需要先有一个PHP父进程,然后开启多个PHP子进程来做同一件事...
如果这时候当其中一个子进程结束或出现问题时通知父进程,父进程就可以做一些事,如关闭其它正在运行的进程等等吧....
想了解一下大家在此类问题上是怎么实现或处理的?
我一般用php daemon来做，一个进程作为父进程一直跑着（可能是个while + sleep），父进程判断时间到了，就fork一个/多个子进程来处理业务，这时父进程监听子进程退出信号，子进程业务执行完了就退出了，这时父进程会检测到，直到所有子进程退出。
一个原则就是父进程尽可能简单，不要处理业务逻辑，从而保证父进程的稳定性。子进程去处理业务，即使出现FataErr也不会导致所有进程退出。
还有个小提示：信号是可以被覆盖的，也就是说两个子进程退出时，父进程可能只收到一个信号，这时父进程应该用while循环来处理子进程退出事件
http://cn2.php.net/manual/zh/function.pcntl-waitpid.php
php手册还是非常有学习价值的
题主会了吗？我这边用了下pcntl这个方法，貌似要捕获子进程状态的时候父进程就会被阻塞，不过PHP从5.3之后开始支持多线程了
用筷子炒菜不知道是什么样的感觉？
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