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https://git.haproxy.org/git/haproxy.git/
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739879a23b
The include part was renamed by commit 2741c8c but I somehow missed
the renaming of the C file, whose name didn't match the H file anymore.
133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/*
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* Buffer management functions.
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*
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* Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <haproxy/api.h>
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#include <haproxy/dynbuf.h>
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#include <haproxy/global.h>
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#include <haproxy/list.h>
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#include <haproxy/pool.h>
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struct pool_head *pool_head_buffer;
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/* list of objects waiting for at least one buffer */
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struct mt_list buffer_wq = LIST_HEAD_INIT(buffer_wq);
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/* perform minimal intializations, report 0 in case of error, 1 if OK. */
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int init_buffer()
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{
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void *buffer;
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pool_head_buffer = create_pool("buffer", global.tune.bufsize, MEM_F_SHARED|MEM_F_EXACT);
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if (!pool_head_buffer)
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return 0;
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/* The reserved buffer is what we leave behind us. Thus we always need
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* at least one extra buffer in minavail otherwise we'll end up waking
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* up tasks with no memory available, causing a lot of useless wakeups.
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* That means that we always want to have at least 3 buffers available
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* (2 for current session, one for next session that might be needed to
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* release a server connection).
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*/
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pool_head_buffer->minavail = MAX(global.tune.reserved_bufs, 3);
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if (global.tune.buf_limit)
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pool_head_buffer->limit = global.tune.buf_limit;
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buffer = pool_refill_alloc(pool_head_buffer, pool_head_buffer->minavail - 1);
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if (!buffer)
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return 0;
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pool_free(pool_head_buffer, buffer);
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return 1;
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}
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/*
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* Dumps part or all of a buffer.
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*/
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void buffer_dump(FILE *o, struct buffer *b, int from, int to)
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{
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fprintf(o, "Dumping buffer %p\n", b);
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fprintf(o, " orig=%p size=%u head=%u tail=%u data=%u\n",
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b_orig(b), (unsigned int)b_size(b), (unsigned int)b_head_ofs(b), (unsigned int)b_tail_ofs(b), (unsigned int)b_data(b));
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fprintf(o, "Dumping contents from byte %d to byte %d\n", from, to);
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fprintf(o, " 0 1 2 3 4 5 6 7 8 9 a b c d e f\n");
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/* dump hexa */
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while (from < to) {
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int i;
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fprintf(o, " %04x: ", from);
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for (i = 0; ((from + i) < to) && (i < 16) ; i++) {
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fprintf(o, "%02x ", (unsigned char)b_orig(b)[from + i]);
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if (((from + i) & 15) == 7)
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fprintf(o, "- ");
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}
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if (to - from < 16) {
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int j = 0;
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for (j = 0; j < from + 16 - to; j++)
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fprintf(o, " ");
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if (j > 8)
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fprintf(o, " ");
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}
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fprintf(o, " ");
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for (i = 0; (from + i < to) && (i < 16) ; i++) {
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fprintf(o, "%c", isprint((unsigned char)b_orig(b)[from + i]) ? b_orig(b)[from + i] : '.') ;
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if ((((from + i) & 15) == 15) && ((from + i) != to-1))
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fprintf(o, "\n");
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}
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from += i;
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}
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fprintf(o, "\n--\n");
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fflush(o);
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}
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/* see offer_buffer() for details */
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void __offer_buffer(void *from, unsigned int threshold)
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{
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struct buffer_wait *wait;
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struct mt_list *elt1, elt2;
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int avail;
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/* For now, we consider that all objects need 1 buffer, so we can stop
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* waking up them once we have enough of them to eat all the available
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* buffers. Note that we don't really know if they are streams or just
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* other tasks, but that's a rough estimate. Similarly, for each cached
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* event we'll need 1 buffer. If no buffer is currently used, always
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* wake up the number of tasks we can offer a buffer based on what is
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* allocated, and in any case at least one task per two reserved
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* buffers.
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*/
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avail = pool_head_buffer->allocated - pool_head_buffer->used - global.tune.reserved_bufs / 2;
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mt_list_for_each_entry_safe(wait, &buffer_wq, list, elt1, elt2) {
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if (avail <= threshold)
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break;
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if (wait->target == from || !wait->wakeup_cb(wait->target))
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continue;
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MT_LIST_DEL_SAFE(elt1);
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avail--;
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}
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}
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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