2 * UCW Library -- Universal Sorter: Operations on Contexts, Buffers and Buckets
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.
11 #include "lib/fastbuf.h"
12 #include "lib/mempool.h"
13 #include "lib/sorter/common.h"
18 sorter_alloc(struct sort_context *ctx, uns size)
20 return mp_alloc_zero(ctx->pool, size);
24 sbuck_new(struct sort_context *ctx)
26 struct sort_bucket *b = sorter_alloc(ctx, sizeof(struct sort_bucket));
32 sbuck_drop(struct sort_bucket *b)
36 ASSERT(!(b->flags & SBF_DESTROYED));
41 b->flags = SBF_DESTROYED;
46 sbuck_size(struct sort_bucket *b)
48 if ((b->flags & SBF_OPEN_WRITE) && !(b->flags & SBF_SWAPPED_OUT))
55 sbuck_have(struct sort_bucket *b)
57 return b && sbuck_size(b);
61 sbuck_has_file(struct sort_bucket *b)
63 return (b->fb || (b->flags & SBF_SWAPPED_OUT));
67 sbuck_swap_in(struct sort_bucket *b)
69 if (b->flags & SBF_SWAPPED_OUT)
71 b->fb = bopen(b->filename, O_RDWR, sorter_stream_bufsize);
72 if (b->flags & SBF_OPEN_WRITE)
73 bseek(b->fb, 0, SEEK_END);
74 bconfig(b->fb, BCONFIG_IS_TEMP_FILE, 1); /* FIXME: Was it always so? */
75 b->flags &= ~SBF_SWAPPED_OUT;
76 SORT_XTRACE("Swapped in %s", b->filename);
81 sbuck_read(struct sort_bucket *b)
84 if (b->flags & SBF_OPEN_READ)
86 else if (b->flags & SBF_OPEN_WRITE)
88 b->size = btell(b->fb);
89 b->flags = (b->flags & ~SBF_OPEN_WRITE) | SBF_OPEN_READ;
98 sbuck_write(struct sort_bucket *b)
101 if (b->flags & SBF_OPEN_WRITE)
105 ASSERT(!(b->flags & (SBF_OPEN_READ | SBF_DESTROYED)));
106 b->fb = bopen_tmp(sorter_stream_bufsize);
107 if (sorter_debug & SORT_DEBUG_KEEP_BUCKETS)
108 bconfig(b->fb, BCONFIG_IS_TEMP_FILE, 0);
109 b->flags |= SBF_OPEN_WRITE;
110 b->filename = mp_strdup(b->ctx->pool, b->fb->name);
116 sbuck_swap_out(struct sort_bucket *b)
118 if ((b->flags & (SBF_OPEN_READ | SBF_OPEN_WRITE)) && b->fb)
120 if (b->flags & SBF_OPEN_WRITE)
121 b->size = btell(b->fb);
122 bconfig(b->fb, BCONFIG_IS_TEMP_FILE, 0);
125 b->flags |= SBF_SWAPPED_OUT;
126 SORT_XTRACE("Swapped out %s", b->filename);
131 sorter_alloc_buf(struct sort_context *ctx)
135 u64 bs = MAX(sorter_bufsize/2, 1);
136 bs = ALIGN_TO(bs, (u64)CPU_PAGE_SIZE);
137 ctx->big_buf = big_alloc(2*bs);
138 ctx->big_buf_size = 2*bs;
139 ctx->big_buf_half = ((byte*) ctx->big_buf) + bs;
140 ctx->big_buf_half_size = bs;
141 SORT_XTRACE("Allocated sorting buffer (%jd bytes)", (uintmax_t) bs);
145 sorter_free_buf(struct sort_context *ctx)
149 big_free(ctx->big_buf, ctx->big_buf_size);
151 SORT_XTRACE("Freed sorting buffer");