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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.
- make-thread THUNK #!optional NAMEprocedure
Creates a mailbox thread that will run THUNK and names it after NAME.
- thread-specific-set! THREAD OBJECTprocedure
Like srfi-18's procedure this one sets the thread-specific of THREAD to OBJECT.
- thread-specific THREADprocedure
Returns the thread-specific object of THREAD.
- thread-send THREAD MSGprocedure
Sends a MSG to THREAD's mailbox.
- thread-start! THREADprocedure
Starts THREAD if it is a thread, if THREAD is a procedure make-thread is called first.
- thread? THREADprocedure
Returns #t if THREAD is a mailbox-thread.
- thread-receive #!optional TIMEOUT DEFAULTprocedure
Returns the next message of the current thread's mailbox. This will block until a message arrives unless TIMEOUT is given (for definition of time units see mailbox-receive! procedure). If the timeout is reached DEFAULT is returned.
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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- 1.4 ; Export current-thread procedure, found by megane
- 1.3 ; Fix returning and using a unspecified value. Thanks to the new scrutinizer.
- Fix author entry, thanks to Peter Bex.
- Initial release