Session locking php_redis extension

[vv3d0x]

Hi, php_redis.so/php_redis.dll ext has an error while working with sessions.
This wrapper has no lock for thread.

session.save_handler = "redis"
session.save_path = "tcp://127.0.0.1:6379?weight=2&timeout=2.5"

counter.php

frameset.php

When I use files as session handler I have net result in window
2|3
When used redis as session handler
2|2

Wrapper must lock data while working with it

[yatsukhnenko]

Duplicates #37