Class: Mutex

Inherits:

Object

• Object
• Mutex

Defined in:

opal/stdlib/thread.rb

Instance Method Summary

• #initialize ⇒ Mutex constructor

  A new instance of Mutex.

• #lock ⇒ Object
• #locked? ⇒ Boolean
• #owned? ⇒ Boolean
• #synchronize ⇒ Object
• #try_lock ⇒ Object
• #unlock ⇒ Object

Constructor Details

#initialize ⇒ Mutex

Returns a new instance of Mutex

# File 'opal/stdlib/thread.rb', line 120

def initialize
  # We still keep the @locked state so any logic based on try_lock while
  # held yields reasonable results.
  @locked = false
end

Instance Method Details

#lock ⇒ Object

# File 'opal/stdlib/thread.rb', line 126

def lock
  fail ThreadError, "Deadlock" if @locked
  @locked = true
  self
end

#locked? ⇒ Boolean

Returns:

• (Boolean)

# File 'opal/stdlib/thread.rb', line 132

def locked?
  @locked
end

#owned? ⇒ Boolean

Returns:

• (Boolean)

# File 'opal/stdlib/thread.rb', line 136

def owned?
  # Being the only "thread", we implicitly own any locked mutex.
  @locked
end

#synchronize ⇒ Object

# File 'opal/stdlib/thread.rb', line 156

def synchronize
  lock
  begin
    yield
  ensure
    unlock
  end
end

#try_lock ⇒ Object

# File 'opal/stdlib/thread.rb', line 141

def try_lock
  if locked?
    false
  else
    lock
    true
  end
end

#unlock ⇒ Object

# File 'opal/stdlib/thread.rb', line 150

def unlock
  fail ThreadError, "Mutex not locked" unless @locked
  @locked = false
  self
end