gcslock-ruby

This is inspired by the Golang version.

1. Setup a new project at the Google APIs Console and enable the Cloud Storage API.
2. Install the Google Cloud SDK tool and configure your project and your OAuth credentials.
3. Create a bucket in which to store your lock file using the command gsutil mb gs://your-bucket-name.
4. Enable object versioning in your bucket using the command gsutil versioning set on gs://your-bucket-name.

In your Ruby code, require gcslock/mutex and use it as follows:

require 'gcslock/mutex'

m = GCSLock::Mutex.new('your-bucket-name', 'my-file.lock')
m.synchronize do
  # Protected and globally serialized computation happens here.
end

In your Ruby code, require gcslock/semaphore and use it as follows:

require 'gcslock/semaphore'

number_of_permits = 10
s = GCSLock::Semaphore.new('your-bucket-name', 'my-file.lock', number_of_permits)
s.acquire
# Work that should be done when semaphore is acquired
s.release