php session读写锁问题
session_start()后 对应的session文件是被锁定的，直到当前脚本结束才会解锁。
在锁定期间，令一个进程访问相同session id 要等文件解锁后session_start()才会开始。
解决办法是在 session 设置好数据后调用 session_write_close() 将数据写入文件并且结束session
例如如下代码
PHP code
session_name("STEST");
session_id("TESTID");
session_start();
$_SESSION["count"]=0;
session_write_close();
sleep(10);
echo "success";
?>
如果不加入session_write_close();
并发3个进程访问该页面，第一个进程执行10秒 第二个执行20秒 第三个执行30秒。
加入session_write_close()后
并发3个进程会同时在10秒后执行完成
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