redlock

a way to achieve distributed lock by redis module

build

git clone  --depth=1 git@github.com:redis/redis.git
cd redis
git clone https://github.com/wujunwei/redlock
cd redlock
make

install

//run it in redis cli or add it into the conf
module load redlock.so

How to use

• slock.lock lock_key （expire_time）
  The command will return result immediately ,you shall call lock in a while or give up locking
• slock.unlock key
  Release the write-lock, if the lock wasn't been created by the same client, it will fail with 0.
• slock.rlock key （expire_time）
  Acquire the read-lock(share lock), if the lock wasn't been created by the same client, it will fail with 0.
• slock.runlock key
  Reduce the readers count of read-lock(share lock), if the readers count equal to 0 ,it will be released.
  This command won't be limited by the different client. if the lock isn't created by the command "slock.rlock", it will fail with 0.
• slock.info key
  This command will return an array with four integers, first is the client id , second is the time when lock was created , the third one is whether the lock is write-lock or not (reply with 0 present lock fail, and otherwise success) and the last one is the count of require the read lock(about the lock command ,it 's always 0).

PLEASE NOTE: The module recommend to be used for stand-alone or Sharding mode,use it carefully.