#include "lib/mempool.h"
#include "lib/sorter/common.h"
-void *
-sorter_alloc(struct sort_context *ctx, uns size)
-{
- return mp_alloc_zero(ctx->pool, size);
-}
-
-struct sort_bucket *
-sbuck_new(struct sort_context *ctx)
-{
- return sorter_alloc(ctx, sizeof(struct sort_bucket));
-}
-
-void
-sbuck_drop(struct sort_bucket *b)
-{
- if (b)
- {
- ASSERT(!(b->flags & SBF_DESTROYED));
- if (b->n.prev)
- clist_remove(&b->n);
- bclose(b->fb);
- bzero(b, sizeof(*b));
- b->flags = SBF_DESTROYED;
- }
-}
-
-sh_off_t
-sbuck_size(struct sort_bucket *b)
-{
- if (b->flags & SBF_OPEN_WRITE)
- return btell(b->fb);
- else
- return b->size;
-}
-
-int
-sbuck_have(struct sort_bucket *b)
-{
- return b && sbuck_size(b);
-}
-
-struct fastbuf *
-sbuck_read(struct sort_bucket *b)
-{
- /* FIXME: These functions should handle buckets with no fb and only name. */
- ASSERT(b->fb);
- if (b->flags & SBF_OPEN_READ)
- return b->fb;
- else if (b->flags & SBF_OPEN_WRITE)
- {
- b->size = btell(b->fb);
- b->flags = (b->flags & ~SBF_OPEN_WRITE) | SBF_OPEN_READ;
- brewind(b->fb);
- return b->fb;
- }
- else
- ASSERT(0);
-}
-
-struct fastbuf *
-sbuck_write(struct sort_bucket *b)
-{
- if (b->flags & SBF_OPEN_WRITE)
- ASSERT(b->fb);
- else
- {
- ASSERT(!(b->flags & (SBF_OPEN_READ | SBF_DESTROYED)));
- b->fb = bopen_tmp(sorter_stream_bufsize);
- b->flags |= SBF_OPEN_WRITE;
- }
- return b->fb;
-}
-
-void
-sorter_alloc_buf(struct sort_context *ctx)
-{
- if (ctx->big_buf)
- return;
- u64 bs = MAX(sorter_bufsize/2, 1);
- bs = ALIGN_TO(bs, (u64)CPU_PAGE_SIZE);
- ctx->big_buf = big_alloc(2*bs);
- ctx->big_buf_size = 2*bs;
- ctx->big_buf_half = ((byte*) ctx->big_buf) + bs;
- ctx->big_buf_half_size = bs;
- SORT_XTRACE("Allocated sorting buffer (%jd bytes)", (uintmax_t) bs);
-}
-
-void
-sorter_free_buf(struct sort_context *ctx)
-{
- if (!ctx->big_buf)
- return;
- big_free(ctx->big_buf, ctx->big_buf_size);
- ctx->big_buf = NULL;
- SORT_XTRACE("Freed sorting buffer");
-}
+#include <string.h>
static int sorter_presort(struct sort_context *ctx, struct sort_bucket *in, struct sort_bucket *out, struct sort_bucket *out_only)
{
- /* FIXME: Mode with no presorting (mostly for debugging) */
sorter_alloc_buf(ctx);
if (in->flags & SBF_CUSTOM_PRESORT)
{
static inline struct sort_bucket *
sbuck_join_to(struct sort_bucket *b)
{
+ if (sorter_debug & SORT_DEBUG_NO_JOIN)
+ return NULL;
+
struct sort_bucket *out = (struct sort_bucket *) b->n.prev; // Such bucket is guaranteed to exist
return (out->flags & SBF_FINAL) ? out : NULL;
}
static void
sorter_join(struct sort_bucket *b)
{
- struct sort_bucket *join = sbuck_join_to(b);
- ASSERT(join);
-
- // FIXME: What if the final bucket doesn't contain any file yet?
+ struct sort_bucket *join = (struct sort_bucket *) b->n.prev;
+ ASSERT(join->flags & SBF_FINAL);
+ ASSERT(b->runs == 1);
- SORT_TRACE("Copying %jd bytes to output file", (uintmax_t) sbuck_size(b));
- struct fastbuf *src = sbuck_read(b);
- struct fastbuf *dest = sbuck_write(join);
- bbcopy(src, dest, ~0U);
- sbuck_drop(b);
+ if (!sbuck_has_file(join))
+ {
+ // The final bucket doesn't have any file associated yet, so replace
+ // it with the new bucket.
+ SORT_XTRACE("Replaced final bucket");
+ b->flags |= SBF_FINAL;
+ sbuck_drop(join);
+ }
+ else
+ {
+ SORT_TRACE("Copying %jd bytes to output file", (uintmax_t) sbuck_size(b));
+ struct fastbuf *src = sbuck_read(b);
+ struct fastbuf *dest = sbuck_write(join);
+ bbcopy(src, dest, ~0U);
+ sbuck_drop(b);
+ }
}
static void
struct sort_bucket *ins[3] = { NULL }, *outs[3] = { NULL };
cnode *list_pos = b->n.prev;
struct sort_bucket *join = sbuck_join_to(b);
- if (sorter_debug & SORT_DEBUG_NO_JOIN)
- join = NULL;
if (!(sorter_debug & SORT_DEBUG_NO_PRESORT) || (b->flags & SBF_CUSTOM_PRESORT))
{
SORT_TRACE("Presorting");
ins[0] = sbuck_new(ctx);
- sbuck_read(b);
if (!sorter_presort(ctx, b, ins[0], join ? : ins[0]))
{
+ SORT_XTRACE("Sorted in memory");
if (join)
sbuck_drop(ins[0]);
else
clist_add_head(&ctx->bucket_list, &bout->n);
struct sort_bucket *b;
- while (b = clist_next(&ctx->bucket_list, &bout->n))
+ while (bout = clist_head(&ctx->bucket_list), b = clist_next(&ctx->bucket_list, &bout->n))
{
if (!sbuck_have(b))
sbuck_drop(b);
}
sorter_free_buf(ctx);
+ sbuck_write(bout); // Force empty bucket to a file
SORT_XTRACE("Final size: %jd", (uintmax_t) sbuck_size(bout));
ctx->out_fb = sbuck_read(bout);
}