2 * UCW Library -- Universal Sorter: Common Declarations
4 * (c) 2007 Martin Mares <mj@ucw.cz>
6 * This software may be freely distributed and used according to the terms
7 * of the GNU Lesser General Public License.
10 #ifndef _UCW_SORTER_COMMON_H
11 #define _UCW_SORTER_COMMON_H
13 #include "lib/clists.h"
15 /* Configuration, some of the variables are used by the old sorter, too. */
16 extern uns sorter_trace, sorter_presort_bufsize, sorter_stream_bufsize;
17 extern uns sorter_debug;
18 extern u64 sorter_bufsize;
20 #define SORT_TRACE(x...) do { if (sorter_trace) log(L_DEBUG, x); } while(0)
21 #define SORT_XTRACE(x...) do { if (sorter_trace > 1) log(L_DEBUG, x); } while(0)
24 SORT_DEBUG_NO_PRESORT = 1,
25 SORT_DEBUG_NO_JOIN = 2,
33 u64 size; // Size in bytes (not valid when writing)
34 uns runs; // Number of runs, 0 if not sorted
35 uns hash_bits; // Remaining bits of the hash function
36 byte *ident; // Identifier used in debug messages
39 enum sort_bucket_flags {
40 SBF_FINAL = 1, // This bucket corresponds to the final output file (always 1 run)
41 SBF_SOURCE = 2, // Contains the source file (always 0 runs)
42 SBF_CUSTOM_PRESORT = 4, // Contains source to read via custom presorter
43 SBF_OPEN_WRITE = 256, // We are currently writing to the fastbuf
44 SBF_OPEN_READ = 512, // We are reading from the fastbuf
45 SBF_DESTROYED = 1024, // Already done with, no further references allowed
49 struct fastbuf *in_fb;
50 struct fastbuf *out_fb;
55 void *big_buf, *big_buf_half;
56 size_t big_buf_size, big_buf_half_size;
58 int (*custom_presort)(struct fastbuf *dest, byte *buf, size_t bufsize);
59 // Take as much as possible from the source bucket, sort it in memory and dump to destination bucket.
60 // Return 1 if there is more data available in the source bucket.
61 int (*internal_sort)(struct sort_context *ctx, struct sort_bucket *in, struct sort_bucket *out, struct sort_bucket *out_only);
62 // Two-way split/merge: merge up to 2 source buckets to up to 2 destination buckets.
63 // Bucket arrays are NULL-terminated.
64 void (*twoway_merge)(struct sort_context *ctx, struct sort_bucket **ins, struct sort_bucket **outs);
66 // State variables of internal_sort
71 void sorter_run(struct sort_context *ctx);
73 void *sorter_alloc(struct sort_context *ctx, uns size);
74 void sorter_alloc_buf(struct sort_context *ctx);
75 void sorter_free_buf(struct sort_context *ctx);
77 // Operations on buckets
78 struct sort_bucket *sbuck_new(struct sort_context *ctx);
79 void sbuck_drop(struct sort_bucket *b);
80 int sbuck_have(struct sort_bucket *b);
81 sh_off_t sbuck_size(struct sort_bucket *b);
82 struct fastbuf *sbuck_read(struct sort_bucket *b);
83 struct fastbuf *sbuck_write(struct sort_bucket *b);