Class: ThreadLock

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby-threading-toolkit/thread_lock.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ThreadLock

Returns a new instance of ThreadLock.



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# File 'lib/ruby-threading-toolkit/thread_lock.rb', line 20

def initialize
  @mutex = Mutex.new
  
  @exclusive_done = ConditionVariable.new
  @shared_done = ConditionVariable.new
  
  @exclusive = false
  @shared = []
end

Instance Method Details

#exclusive ⇒ Object 



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# File 'lib/ruby-threading-toolkit/thread_lock.rb', line 46

def exclusive
  @mutex.synchronize do
    raise(NestingThreadLockError, "Unable to obtain exclusive lock inside another shared or exclusive lock") if @shared.include?(Thread.current) || @exclusive == Thread.current

    if @exclusive
      @exclusive_done.wait_while(@mutex) {@exclusive}
    end
    
    @exclusive = Thread.current
    
    unless @shared.empty?
      @shared_done.wait_until(@mutex) {@shared.empty?}
    end
  end
  yield
ensure
  if @mutex.synchronize {@exclusive = false if @exclusive == Thread.current } == false
    @exclusive_done.broadcast
  end
end

#exclusive? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby-threading-toolkit/thread_lock.rb', line 67

def exclusive?
  @mutex.synchronize { @exclusive == Thread.current }
end

#shared ⇒ Object 



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# File 'lib/ruby-threading-toolkit/thread_lock.rb', line 30

def shared
  @mutex.synchronize do
    if @exclusive && @exclusive != Thread.current
      @exclusive_done.wait_while(@mutex) {@exclusive}
    end
    
    @shared << Thread.current
  end
  
  yield
    
ensure
  @mutex.synchronize { @shared.delete_at(@shared.index(Thread.current)) if @shared.index(Thread.current)}
  @shared_done.signal
end