require "./sync/mutex"

# A fiber-safe mutex.
#
# Provides deadlock protection by default. Attempting to re-lock the mutex from
# the same fiber will raise an exception. Trying to unlock an unlocked mutex, or
# a mutex locked by another fiber will raise an exception.
#
# The reentrant protection maintains a lock count. Attempting to re-lock the
# mutex from the same fiber will increment the lock count. Attempting to unlock
# the counter from the same fiber will decrement the lock count, eventually
# releasing the lock when the lock count returns to 0. Attempting to unlock an
# unlocked mutex, or a mutex locked by another fiber will raise an exception.
#
# You also disable all protections with `unchecked`. Attempting to re-lock the
# mutex from the same fiber will deadlock. Any fiber can unlock the mutex, even
# if it wasn't previously locked.
#
# WARNING: `Mutex` is deprecated as of Crystal 1.20. Use `Sync::Mutex` instead.
alias Mutex = Sync::Mutex

# WARNING: `Mutex::Protection` is deprecated as of Crystal 1.20. Use `Sync::Type` instead.
alias Mutex::Protection = Sync::Type

class Sync::Mutex
  # :nodoc:
  def self.new(*, protection : ::Mutex::Protection)
    new(type: protection)
  end
end