Re: [Chicken-users] Thread safe hash tables?

[Reed Sheridan]

> so you think I can mess up the internal data structure of a hash table if

I access it concurrently from two threads? That's nasty. I'll have to put
a bazillion of those
   (dynamic-wind
       (lambda () (mutex-lock! some-hash-mtx))
       (lambda () (do-something-to (mutex-specifix some-hash-mtx)))
       (lambda () (mutex-unlock! some-hash-mtx)))
blocks into my code. But thank you for telling me, because after some
tests I thought the hash tables *were* thread safe.

cu,
Thomas

Why not just do something like:


(define (make-locking-hash-table)
  (cons (make-mutex) (make-hash-table)))

(define (locking-hash-table-set! lht . args)
  (dynamic-wind
      (lambda () (mutex-lock! (car lht)))
      (lambda () (apply hash-table-set! (cdr lht) args ))
      (lambda () ...unlock it)))
?

That seems better than using bazillions of dynamic-winds to me.

Reed Sheridan