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This extension extends srfi-18 in a way that mailboxes are attached to each thread. This makes sending messages to threads possible.
Returns the current thread as an object, converting it to a mailbox-thread if necessary.
[procedure] (make-thread THUNK [NAME])
Creates a mailbox thread that will run THUNK and names it after NAME.
[procedure] (thread-specific-set! THREAD OBJECT)
Like srfi-18's procedure this one sets the thread-specific of THREAD to OBJECT.
[procedure] (thread-specific THREAD)
Returns the thread-specific object of THREAD.
[procedure] (thread-send THREAD MSG)
Sends a MSG to THREAD's mailbox.
[procedure] (thread-start! THREAD)
Starts THREAD if it is a thread, if THREAD is a procedure make-thread is called first.
[predicate] (thread? THREAD)
Returns #t if THREAD is a mailbox-thread.
[procedure] (thread-receive [TIMEOUT [DEFAULT]])
Returns the next message of the current thread's mailbox. This will block until a message arrives unless TIMEOUT is given. If the timeout is reached DEFAULT is returned.
[procedure] thread-mailbox-next [procedure] thread-mailbox-rewind [procedure] thread-mailbox-extract-and-rewind
Those work like their SRFI-18's brothers.
The thread's mailboxes are stored as the usual SRFI-18 thread-specific. To be able to tell mailbox-threads apart from SRFI-18 threads a tag will be added, so the specific looks like this:
('mboxthread specific mbox mbox-cursor)
Therefore the thread-specific and thread-specific-set! procedures are redefined in this module.
Some procedures will add these structures silently to existing threads, current-thread for example.
(use mailbox-threads) (define (t1-thunk) (let ((msg (thread-receive 999))) (if (equal? msg 'quit) (begin (print "Bye Ma!") (thread-terminate! (current-thread))) (begin (print msg) (t1-thunk))))) (define t1 (make-thread t1-thunk 't1)) (thread-send t1 "Hi there!") (thread-start! t1) (thread-send t1 "still awake!") (thread-send t1 "Look Ma! Threads with mailboxes!") ;(thread-send t1 'quit) (thread-start! (lambda () (thread-send t1 "hi from two"))) (thread-specific t1) (thread-specific-set! t1 "hi") (thread-specific t1)
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- Initial release