;;;; Spinlocks
-(defmacro with-deadlocks ((thread lock timeout) &body forms)
+(defmacro with-deadlocks ((thread lock &optional timeout) &body forms)
+ (declare (ignorable timeout))
(with-unique-names (prev n-thread n-lock n-timeout new)
`(let* ((,n-thread ,thread)
(,n-lock ,lock)
- (,n-timeout (or ,timeout
- (when sb!impl::*deadline*
- sb!impl::*deadline-seconds*)))
+ (,n-timeout #!-sb-lutex
+ ,(when timeout
+ `(or ,timeout
+ (when sb!impl::*deadline*
+ sb!impl::*deadline-seconds*))))
;; If we get interrupted while waiting for a lock, etc.
(,prev (thread-waiting-for ,n-thread))
(,new (if ,n-timeout
(when (eq old new)
(error "Recursive lock attempt on ~S." spinlock))
#!+sb-thread
- (with-deadlocks (new spinlock nil)
+ (with-deadlocks (new spinlock)
(flet ((cas ()
(if (sb!ext:compare-and-swap (spinlock-value spinlock) nil new)
(thread-yield)
(detect-deadlock other-lock)))))))
(deadlock-chain (thread lock)
(let* ((other-thread (lock-owner lock))
- (other-lock (thread-waiting-for other-thread)))
+ (other-lock (when other-thread
+ (thread-waiting-for other-thread))))
(cond ((not other-thread)
- ;; The deadlock is gone -- maybe someone timed out?
+ ;; The deadlock is gone -- maybe someone unwound
+ ;; from the same deadlock already?
(return-from check-deadlock nil))
((consp other-lock)
;; There's a timeout -- no deadlock.