+ :lowtag other-pointer-lowtag
+ :widetag complex-double-float-widetag)
+ #!-x86-64 (filler)
+ (real :c-type "double" :length #!-x86-64 2 #!+x86-64 1)
+ (imag :c-type "double" :length #!-x86-64 2 #!+x86-64 1))
+
+#!+(and sb-lutex sb-thread)
+(define-primitive-object (lutex
+ :lowtag other-pointer-lowtag
+ :widetag lutex-widetag
+ :alloc-trans %make-lutex)
+ (gen :c-type "long" :length 1)
+ (live :c-type "long" :length 1)
+ (next :c-type "struct lutex *" :length 1)
+ (prev :c-type "struct lutex *" :length 1)
+ (mutex :c-type "pthread_mutex_t *"
+ :length 1)
+ (mutexattr :c-type "pthread_mutexattr_t *"
+ :length 1)
+ (condition-variable :c-type "pthread_cond_t *"
+ :length 1))
+
+;;; this isn't actually a lisp object at all, it's a c structure that lives
+;;; in c-land. However, we need sight of so many parts of it from Lisp that
+;;; it makes sense to define it here anyway, so that the GENESIS machinery
+;;; can take care of maintaining Lisp and C versions.
+;;; Hence the even-fixnum lowtag just so we don't get odd(sic) numbers
+;;; added to the slot offsets
+(define-primitive-object (thread :lowtag even-fixnum-lowtag)
+ ;; no_tls_value_marker is borrowed very briefly at thread startup to
+ ;; pass the address of initial-function into new_thread_trampoline.
+ ;; tls[0] = NO_TLS_VALUE_MARKER_WIDETAG because a the tls index slot
+ ;; of a symbol is initialized to zero
+ (no-tls-value-marker)
+ (os-thread :c-type "volatile os_thread_t")
+ ;; This is the original address at which the memory was allocated,
+ ;; which may have different alignment then what we prefer to use.
+ ;; Kept here so that when the thread dies we can releast the whole
+ ;; memory we reserved.
+ (os-address :c-type "void *" :length #!+alpha 2 #!-alpha 1)
+ #!+sb-thread
+ (os-attr :c-type "pthread_attr_t *" :length #!+alpha 2 #!-alpha 1)
+ (binding-stack-start :c-type "lispobj *" :length #!+alpha 2 #!-alpha 1)
+ (binding-stack-pointer :c-type "lispobj *" :length #!+alpha 2 #!-alpha 1)
+ (control-stack-start :c-type "lispobj *" :length #!+alpha 2 #!-alpha 1)
+ (control-stack-end :c-type "lispobj *" :length #!+alpha 2 #!-alpha 1)
+ (alien-stack-start :c-type "lispobj *" :length #!+alpha 2 #!-alpha 1)
+ (alien-stack-pointer :c-type "lispobj *" :length #!+alpha 2 #!-alpha 1)
+ #!+gencgc (alloc-region :c-type "struct alloc_region" :length 5)
+ (this :c-type "struct thread *" :length #!+alpha 2 #!-alpha 1)
+ (prev :c-type "struct thread *" :length #!+alpha 2 #!-alpha 1)
+ (next :c-type "struct thread *" :length #!+alpha 2 #!-alpha 1)
+ ;; starting, running, suspended, dead
+ (state :c-type "volatile lispobj")
+ (tls-cookie) ; on x86, the LDT index
+ #!+(or x86 x86-64) (pseudo-atomic-bits)
+ (interrupt-data :c-type "struct interrupt_data *"
+ :length #!+alpha 2 #!-alpha 1)
+ (stepping)
+ (interrupt-contexts :c-type "os_context_t *" :rest-p t))