GBBopen 1.5 Reference -- make-condition-variable

make-condition-variable

make-condition-variable &rest initargs &key class lock => condition-variable [Function]

Purpose
Create a new condition variable.

Package :portable-threads

Module :portable-threads

Arguments and values

initargs		An initialization argument list
class		The name of the class for the created condition-variable instance (default is `condition-variable`)
lock		A lock, a recursive lock, or a condition variable (default is a non-recursive lock)
condition-variable		A condition variable

Returns
The created condition-variable.

Examples
Make a condition-variable instance with a non-recursive lock:

  > (make-condition-variable)
  #<condition-variable>
  >

Make a condition-variable instance with a recursive lock:

  > (make-condition-variable :lock (make-recursive-lock))
  #<condition-variable>
  >

Define a subclass of condition-variable that includes a state slot:

  (defclass state-cv (condition-variable)
    ((state :initarg :state
            :initform nil
            :accessor state-of)))

and then create a state-cv instance with a recursive lock:

  > (make-condition-variable :class 'state-cv
                             :lock (make-recursive-lock))
  #<state-cv>
  >

Note
The make-condition-variable function is equivalent to using make-instance with the desired class for the created condition-variable instance. However, using make-condition-variable is preferable stylistically.

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make-condition-variable