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minix/include/sys/gcq.h
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify. 
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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/* $NetBSD: gcq.h,v 1.2 2007/08/19 07:35:32 kiyohara Exp $ */
/*
* Not (c) 2007 Matthew Orgass
* This file is public domain, meaning anyone can make any use of part or all
* of this file including copying into other works without credit. Any use,
* modified or not, is solely the responsibility of the user. If this file is
* part of a collection then use in the collection is governed by the terms of
* the collection.
*/
/*
* Generic Circular Queues: Pointer arithmetic is used to recover the
* enclosing object. Merge operation is provided. Items can be multiply
* removed, but queue traversal requires separate knowledge of the queue head.
*/
#ifndef _GCQ_H
#define _GCQ_H
#ifdef _KERNEL
#include <sys/types.h>
#include <sys/null.h>
#include <lib/libkern/libkern.h>
#else
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include <assert.h>
#endif
#ifdef GCQ_USE_ASSERT
#define GCQ_ASSERT(x) assert(x)
#else
#ifdef _KERNEL
#define GCQ_ASSERT(x) KASSERT(x)
#else
#define GCQ_ASSERT(x) _DIAGASSERT(x)
#endif
#endif
struct gcq {
struct gcq *q_next;
struct gcq *q_prev;
};
struct gcq_head {
struct gcq hq;
};
#define GCQ_INIT(q) { &(q), &(q) }
#define GCQ_INIT_HEAD(head) { GCQ_INIT((head).hq) }
__attribute__((nonnull, always_inline)) static inline void
gcq_init(struct gcq *q)
{
q->q_next = q->q_prev = q;
}
__attribute__((nonnull, const, warn_unused_result, always_inline))
static inline struct gcq *
gcq_q(struct gcq *q)
{
return q;
}
__attribute__((nonnull, const, warn_unused_result, always_inline))
static inline struct gcq *
gcq_hq(struct gcq_head *head)
{
return (struct gcq *)head;
}
__attribute__((nonnull, const, warn_unused_result, always_inline))
static inline struct gcq_head *
gcq_head(struct gcq *q)
{
return (struct gcq_head *)q;
}
__attribute__((nonnull, always_inline)) static inline void
gcq_init_head(struct gcq_head *head)
{
gcq_init(gcq_hq(head));
}
__attribute__((nonnull, pure, warn_unused_result, always_inline))
static inline bool
gcq_onlist(struct gcq *q)
{
return (q->q_next != q);
}
__attribute__((nonnull, pure, warn_unused_result, always_inline))
static inline bool
gcq_empty(struct gcq_head *head)
{
return (!gcq_onlist(gcq_hq(head)));
}
__attribute__((nonnull, pure, warn_unused_result, always_inline))
static inline bool
gcq_linked(struct gcq *prev, struct gcq *next)
{
return (prev->q_next == next && next->q_prev == prev);
}
__attribute__((nonnull, always_inline)) static inline void
gcq_insert_after(struct gcq *on, struct gcq *off)
{
struct gcq *on_next;
GCQ_ASSERT(off->q_next == off && off->q_prev == off);
on_next = on->q_next;
off->q_prev = on;
off->q_next = on_next;
on_next->q_prev = off;
on->q_next = off;
}
__attribute__((nonnull)) static inline void
gcq_insert_before(struct gcq *on, struct gcq *off)
{
struct gcq *on_prev;
GCQ_ASSERT(off->q_next == off && off->q_prev == off);
on_prev = on->q_prev;
off->q_next = on;
off->q_prev = on_prev;
on_prev->q_next = off;
on->q_prev = off;
}
__attribute__((nonnull, always_inline)) static inline void
gcq_insert_head(struct gcq_head *head, struct gcq *q)
{
gcq_insert_after(gcq_hq(head), q);
}
__attribute__((nonnull, always_inline)) static inline void
gcq_insert_tail(struct gcq_head *head, struct gcq *q)
{
gcq_insert_before(gcq_hq(head), q);
}
__attribute__((nonnull)) static inline void
gcq_tie(struct gcq *dst, struct gcq *src)
{
struct gcq *dst_next, *src_prev;
dst_next = dst->q_next;
src_prev = src->q_prev;
src_prev->q_next = dst_next;
dst_next->q_prev = src_prev;
src->q_prev = dst;
dst->q_next = src;
}
__attribute__((nonnull, always_inline)) static inline void
gcq_tie_after(struct gcq *dst, struct gcq *src)
{
GCQ_ASSERT(dst != src && dst->q_prev != src);
gcq_tie(dst, src);
}
__attribute__((nonnull, always_inline)) static inline void
gcq_tie_before(struct gcq *dst, struct gcq *src)
{
gcq_tie_after(dst->q_prev, src);
}
__attribute__((nonnull)) static inline struct gcq *
gcq_remove(struct gcq *q)
{
struct gcq *next, *prev;
next = q->q_next;
prev = q->q_prev;
prev->q_next = next;
next->q_prev = prev;
gcq_init(q);
return q;
}
#ifdef GCQ_UNCONDITIONAL_MERGE
__attribute__((nonnull)) static inline void
gcq_merge(struct gcq *dst, struct gcq *src)
{
GCQ_ASSERT(dst != src && dst->q_prev != src);
gcq_tie(dst, src);
gcq_tie(src, src);
}
__attribute__((nonnull, always_inline)) static inline void
gcq_merge_head(struct gcq_head *dst, struct gcq_head *src)
{
gcq_merge(gcq_hq(dst), gcq_hq(src));
}
__attribute__((nonnull, always_inline)) static inline void
gcq_merge_tail(struct gcq_head *dst, struct gcq_head *src)
{
gcq_merge(gcq_hq(dst)->q_prev, gcq_hq(src));
}
#else
__attribute__((nonnull)) static inline void
gcq_merge(struct gcq *dst, struct gcq *src)
{
struct gcq *dst_next, *src_prev, *src_next;
GCQ_ASSERT(dst != src && dst->q_prev != src);
if (gcq_onlist(src)) {
dst_next = dst->q_next;
src_prev = src->q_prev;
src_next = src->q_next;
dst_next->q_prev = src_prev;
src_prev->q_next = dst_next;
dst->q_next = src_next;
src_next->q_prev = dst;
gcq_init(src);
}
}
__attribute__((nonnull, always_inline)) static inline void
gcq_merge_head(struct gcq_head *dst, struct gcq_head *src)
{
gcq_merge(gcq_hq(dst), gcq_hq(src));
}
__attribute__((nonnull, always_inline)) static inline void
gcq_merge_tail(struct gcq_head *dst, struct gcq_head *src)
{
gcq_merge(gcq_hq(dst)->q_prev, gcq_hq(src));
}
#endif
__attribute__((nonnull)) static inline void
gcq_clear(struct gcq *q)
{
struct gcq *nq, *next;
nq=q;
do {
next = nq->q_next;
gcq_init(nq);
nq = next;
} while (next != q);
}
__attribute__((nonnull, always_inline)) static inline void
gcq_remove_all(struct gcq_head *head)
{
gcq_clear(gcq_hq(head));
}
__attribute__((nonnull, always_inline)) static inline struct gcq *
_gcq_next(struct gcq *current, struct gcq_head *head, struct gcq *start)
{
struct gcq *q, *hq;
hq = gcq_hq(head);
q = current->q_next;
if (hq != start && q == hq)
q = hq->q_next;
if (current != start)
GCQ_ASSERT(gcq_onlist(current));
return q;
}
__attribute__((nonnull, always_inline)) static inline struct gcq *
_gcq_prev(struct gcq *current, struct gcq_head *head, struct gcq *start)
{
struct gcq *q, *hq;
hq = gcq_hq(head);
q = current->q_prev;
if (hq != start && q == hq)
q = hq->q_prev;
if (current != start)
GCQ_ASSERT(gcq_onlist(current));
return q;
}
#define GCQ_ITEM(q, type, name) \
((type *)(void *)((uint8_t *)gcq_q(q) - offsetof(type, name)))
#define _GCQ_GDQ(var, h, ptr, fn) (gcq_hq(h)->ptr != gcq_hq(h) ? \
(var = fn(gcq_hq(h)->ptr), true) : (var = NULL, false))
#define _GCQ_GDQ_TYPED(tvar, h, type, name, ptr, fn) \
(gcq_hq(h)->ptr != gcq_hq(h) ? (tvar = GCQ_ITEM(fn(gcq_hq(h)->ptr), \
type, name), true) : (tvar = NULL, false))
#define _GCQ_NP(var, current, head, start, np, fn) \
(np(current, head, start) != (start) ? \
(var = fn(np(current, head, start)), true) : (var = NULL, false))
#define _GCQ_NP_TYPED(tvar, current, head, start, type, name, np, fn) \
(np(current, head, start) != (start) ? \
(tvar = GCQ_ITEM(fn(np(current, head, start)), type, name), true) : \
(tvar = NULL, false))
#define _GCQ_GDQ_COND(var, h, ptr, rem, cond) \
(gcq_hq(h)->ptr != gcq_hq(h) ? (var = gcq_hq(h)->ptr, \
((cond) ? (rem, true) : (var = NULL, false))) : \
(var = NULL, false))
#define _GCQ_GDQ_COND_TYPED(tvar, h, type, name, ptr, rem, cond) \
(gcq_hq(h)->ptr != gcq_hq(h) ? (tvar = GCQ_ITEM(gcq_hq(h)->ptr, \
type, name), ((cond) ? (rem, true) : (tvar = NULL, false))) : \
(tvar = NULL, false))
#define _GCQ_NP_COND(var, current, head, start, np, rem, cond) \
(np(current, head, start) != (start) ? \
(var = fn(np(current, head, start)), ((cond) ? (rem), true) : \
(var = NULL, false))) : (var = NULL, false))
#define _GCQ_NP_COND_TYPED(tvar, current, head, start, type, name, np, \
rem, cond) (np(current, head, start) != (start) ? \
(tvar = GCQ_ITEM(fn(np(current, head, start)), type, name), \
((cond) ? (rem, true) : (var = NULL, false))) : \
(tvar = NULL, false))
#define GCQ_GOT_FIRST(var, h) _GCQ_GDQ(var, h, q_next, gcq_q)
#define GCQ_GOT_LAST(var, h) _GCQ_GDQ(var, h, q_prev, gcq_q)
#define GCQ_DEQUEUED_FIRST(var, h) _GCQ_GDQ(var, h, q_next, gcq_remove)
#define GCQ_DEQUEUED_LAST(var, h) _GCQ_GDQ(var, h, q_prev, gcq_remove)
#define GCQ_GOT_FIRST_TYPED(tvar, h, type, name) \
_GCQ_GDQ_TYPED(tvar, h, type, name, q_next, gcq_q)
#define GCQ_GOT_LAST_TYPED(tvar, h, type, name) \
_GCQ_GDQ_TYPED(tvar, h, type, name, q_prev, gcq_q)
#define GCQ_DEQUEUED_FIRST_TYPED(tvar, h, type, name) \
_GCQ_GDQ_TYPED(tvar, h, type, name, q_next, gcq_remove)
#define GCQ_DEQUEUED_LAST_TYPED(tvar, h, type, name) \
_GCQ_GDQ_TYPED(tvar, h, type, name, q_prev, gcq_remove)
#define GCQ_GOT_NEXT(var, current, head, start) \
_GCQ_NP(var, current, head, start, _gcq_next, gcq_q)
#define GCQ_GOT_PREV(var, current, head, start) \
_GCQ_NP(var, current, head, start, _gcq_prev, gcq_q)
#define GCQ_DEQUEUED_NEXT(var, current, head, start) \
_GCQ_NP(var, current, head, start, _gcq_next, gcq_remove)
#define GCQ_DEQUEUED_PREV(var, current, head, start) \
_GCQ_NP(var, current, head, start, _gcq_prev, gcq_remove)
#define GCQ_GOT_NEXT_TYPED(tvar, current, head, start, type, name) \
_GCQ_NP_TYPED(tvar, current, head, start, type, name, \
_gcq_next, gcq_q)
#define GCQ_GOT_PREV_TYPED(tvar, current, head, start, type, name) \
_GCQ_NP_TYPED(tvar, current, head, start, type, name, \
_gcq_prev, gcq_q)
#define GCQ_DEQUEUED_NEXT_TYPED(tvar, current, head, start, type, name) \
_GCQ_NP_TYPED(tvar, current, head, start, type, name, \
_gcq_next, gcq_remove)
#define GCQ_DEQUEUED_PREV_TYPED(tvar, current, head, start, type, name) \
_GCQ_NP_TYPED(tvar, current, head, start, type, name, \
_gcq_prev, gcq_remove)
#define GCQ_GOT_FIRST_COND(var, h, cond) \
_GCQ_GDQ_COND(var, h, q_next, ((void)0), cond)
#define GCQ_GOT_LAST_COND(var, h, cond) \
_GCQ_GDQ_COND(var, h, q_prev, ((void)0), cond)
#define GCQ_DEQUEUED_FIRST_COND(var, h, cond) \
_GCQ_GDQ_COND(var, h, q_next, gcq_remove(var), cond)
#define GCQ_DEQUEUED_LAST_COND(var, h, cond) \
_GCQ_GDQ_COND(var, h, q_prev, gcq_remove(var), cond)
#define GCQ_GOT_FIRST_COND_TYPED(tvar, h, type, name, cond) \
_GCQ_GDQ_COND_TYPED(tvar, h, type, name, q_next, ((void)0), cond)
#define GCQ_GOT_LAST_COND_TYPED(tvar, h, type, name, cond) \
_GCQ_GDQ_COND_TYPED(tvar, h, type, name, q_prev, ((void)0), cond)
#define GCQ_DEQUEUED_FIRST_COND_TYPED(tvar, h, type, name, cond) \
_GCQ_GDQ_COND_TYPED(tvar, h, type, name, q_next, \
gcq_remove(&(tvar)->name), cond)
#define GCQ_DEQUEUED_LAST_COND_TYPED(tvar, h, type, name, cond) \
_GCQ_GDQ_COND_TYPED(tvar, h, type, name, q_prev, \
gcq_remove(&(tvar)->name), cond)
#define GCQ_GOT_NEXT_COND(var, current, head, start, cond) \
_GCQ_NP_COND(var, current, head, start, _gcq_next, ((void)0), cond)
#define GCQ_GOT_PREV_COND(var, current, head, start, cond) \
_GCQ_NP_COND(var, current, head, start, _gcq_prev, ((void)0), cond)
#define GCQ_DEQUEUED_NEXT_COND(var, current, head, start, cond) \
_GCQ_NP_COND(var, current, head, start, _gcq_next, gcq_remove(var), \
cond)
#define GCQ_DEQUEUED_PREV_COND(var, current, head, start, cond) \
_GCQ_NP_COND(var, current, head, start, _gcq_prev, gcq_remove(var), \
cond)
#define GCQ_GOT_NEXT_COND_TYPED(tvar, current, head, start, type, name, \
cond) _GCQ_NP_COND_TYPED(tvar, current, head, start, type, name, \
_gcq_next, ((void)0), cond)
#define GCQ_GOT_PREV_COND_TYPED(tvar, current, head, start, type, name, \
cond) _GCQ_NP_COND_TYPED(tvar, current, head, start, type, name, \
_gcq_prev, ((void)0), cond)
#define GCQ_DEQUEUED_NEXT_COND_TYPED(tvar, current, head, start, type, \
name, cond) _GCQ_NP_COND_TYPED(tvar, current, head, start, type, \
name, _gcq_next, gcq_remove(&(tvar)->name), cond)
#define GCQ_DEQUEUED_PREV_COND_TYPED(tvar, current, head, start, type, \
name, cond) _GCQ_NP_COND_TYPED(tvar, current, head, start, type, \
name, _gcq_prev, gcq_remove(&(tvar)->name), cond)
#define _GCQ_FOREACH(var, h, tnull, item, ptr) \
for ((var)=gcq_hq(h)->ptr; ((var) != gcq_hq(h) && \
(GCQ_ASSERT(gcq_onlist(var)), item, true)) || \
(tnull, false); (var)=(var)->ptr)
#define _GCQ_FOREACH_NVAR(var, nvar, h, tnull, item, ptr, ol, rem, ro) \
for ((nvar)=gcq_hq(h)->ptr; (((var)=(nvar), (nvar) != gcq_hq(h)) && \
(ol, (nvar)=(nvar)->ptr, rem, item, true)) || (tnull, false); ro)
#define GCQ_FOREACH(var, h) \
_GCQ_FOREACH(var, h, ((void)0), ((void)0), q_next)
#define GCQ_FOREACH_REV(var, h) \
_GCQ_FOREACH(var, h, ((void)0), ((void)0), q_prev)
#define GCQ_FOREACH_NVAR(var, nvar, h) \
_GCQ_FOREACH_NVAR(var, nvar, h, ((void)0), ((void)0), \
q_next, GCQ_ASSERT(gcq_onlist(nvar)), ((void)0), ((void)0))
#define GCQ_FOREACH_NVAR_REV(var, nvar, h) \
_GCQ_FOREACH_NVAR(var, nvar, h, ((void)0), ((void)0), \
q_prev, GCQ_ASSERT(gcq_onlist(nvar)), ((void)0), ((void)0))
#define GCQ_FOREACH_RO(var, nvar, h) \
_GCQ_FOREACH_NVAR(var, nvar, h, ((void)0), ((void)0), \
q_next, ((void)0), ((void)0), GCQ_ASSERT(gcq_linked(var, nvar)))
#define GCQ_FOREACH_RO_REV(var, nvar, h) \
_GCQ_FOREACH_NVAR(var, nvar, h, ((void)0), ((void)0), \
q_prev, ((void)0), ((void)0), GCQ_ASSERT(gcq_linked(nvar, var)))
#define GCQ_FOREACH_DEQUEUED(var, nvar, h) \
_GCQ_FOREACH_NVAR(var, nvar, h, ((void)0), ((void)0), \
q_next, GCQ_ASSERT(gcq_onlist(nvar)), gcq_remove(var), ((void)0)
#define GCQ_FOREACH_DEQUEUED_REV(var, nvar, h) \
_GCQ_FOREACH_NVAR(var, nvar, h, ((void)0), ((void)0), \
q_prev, GCQ_ASSERT(gcq_onlist(nvar)), gcq_remove(var), ((void)0)
#define GCQ_FOREACH_TYPED(var, h, tvar, type, name) \
_GCQ_FOREACH(var, h, (tvar)=NULL, (tvar)=GCQ_ITEM(var, type, name), \
q_next)
#define GCQ_FOREACH_TYPED_REV(var, h, tvar, type, name) \
_GCQ_FOREACH(var, h, (tvar)=NULL, (tvar)=GCQ_ITEM(var, type, name), \
q_prev)
#define GCQ_FOREACH_NVAR_TYPED(var, nvar, h, tvar, type, name) \
_GCQ_FOREACH_NVAR(var, nvar, h, (tvar)=NULL, \
(tvar)=GCQ_ITEM(var, type, name), \
q_next, GCQ_ASSERT(gcq_onlist(nvar)), ((void)0), ((void)0))
#define GCQ_FOREACH_NVAR_REV_TYPED(var, nvar, h, tvar, type, name) \
_GCQ_FOREACH_NVAR(var, nvar, h, (tvar)=NULL, \
(tvar)=GCQ_ITEM(var, type, name), \
q_prev, GCQ_ASSERT(gcq_onlist(nvar)), ((void)0), ((void)0))
#define GCQ_FOREACH_RO_TYPED(var, nvar, h, tvar, type, name) \
_GCQ_FOREACH_NVAR(var, nvar, h, (tvar)=NULL, \
(tvar)=GCQ_ITEM(var, type, name), \
q_next, ((void)0), ((void)0), GCQ_ASSERT(gcq_lined(var, nvar)))
#define GCQ_FOREACH_RO_REV_TYPED(var, nvar, h, tvar, type, name) \
_GCQ_FOREACH_NVAR(var, nvar, h, (tvar)=NULL, \
(tvar)=GCQ_ITEM(var, type, name), \
q_prev, ((void)0), ((void)0), GCQ_ASSERT(gcq_linked(nvar, var)))
#define GCQ_FOREACH_DEQUEUED_TYPED(var, nvar, h, tvar, type, name) \
_GCQ_FOREACH_NVAR(var, nvar, h, (tvar)=NULL, \
(tvar)=GCQ_ITEM(var, type, name), \
q_next, GCQ_ASSERT(gcq_onlist(nvar)), gcq_remove(var), ((void)0))
#define GCQ_FOREACH_DEQUEUED_REV_TYPED(var, nvar, h, tvar, type, name) \
_GCQ_FOREACH_NVAR(var, nvar, h, (tvar)=NULL, \
(tvar)=GCQ_ITEM(var, type, name), \
q_prev, GCQ_ASSERT(gcq_onlist(nvar)), gcq_remove(var), ((void)0))
#define _GCQ_COND(fe, cond) do { fe { if (cond) break; } } while (0)
#define GCQ_FIND(var, h, cond) _GCQ_COND(GCQ_FOREACH(var, h), cond)
#define GCQ_FIND_REV(var, h, cond) _GCQ_COND(GCQ_FOREACH_REV(var, h), cond)
#define GCQ_FIND_TYPED(var, h, tvar, type, name, cond) \
_GCQ_COND(GCQ_FOREACH_TYPED(var, h, tvar, type, name), cond)
#define GCQ_FIND_TYPED_REV(var, h, tvar, type, name, cond) \
_GCQ_COND(GCQ_FOREACH_REV_TYPED(var, h, tvar, type, name), cond)
#endif /* _GCQ_H */
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