Flowdock

Mutex implements a simple semaphore that can be used to coordinate access to shared data from multiple concurrent threads.

Example:

semaphore = Mutex.new

a = Thread.new {
  semaphore.synchronize {
    # access shared resource
  }
}

b = Thread.new {
  semaphore.synchronize {
    # access shared resource
  }
}
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December 9, 2014
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See also ConditionVariable

If you need to and processing with respect to a particular resource between 2 or more threads in more complicated ways, it is likely that ConditionVariable is what you’re looking for.