- ;; for EQ hash tables, and when present the value of #x8000000
- ;; represents EQ-based hashing on the respective key.
- (hash-vector nil :type (or null (simple-array (unsigned-byte 32) (*)))))
+ ;; for EQ hash tables, and when present the value of
+ ;; +MAGIC-HASH-VECTOR-VALUE+ represents EQ-based hashing on the
+ ;; respective key.
+ (hash-vector nil :type (or null (simple-array (unsigned-byte
+ #.sb!vm:n-word-bits) (*))))
+ ;; This lock is acquired by %PUTHASH, REMHASH, CLRHASH and GETHASH.
+ (spinlock (sb!thread::make-spinlock)))
+
+;; as explained by pmai on openprojects #lisp IRC 2002-07-30: #x80000000
+;; is bigger than any possible nonEQ hash value, and thus indicates an
+;; empty slot; and EQ hash tables don't use HASH-TABLE-HASH-VECTOR.
+;; The previous sentence was written when SBCL was 32-bit only. The value
+;; now depends on the word size. It is propagated to C in genesis because
+;; the generational garbage collector needs to know it.
+(defconstant +magic-hash-vector-value+ (ash 1 (1- sb!vm:n-word-bits)))
+