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annotate arena.c @ 995:2bc27415565b

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Fix some stuff with interrupt timing. The change in adjust_int_cycle gets Overdrive working again (vint was not being preferred over hint in some cases). One of the changes seems to have broken Fatal Rewind again, but no other regressions that I can see.
author Michael Pavone <pavone@retrodev.com>
date Sat, 30 Apr 2016 08:37:55 -0700
parents 9f149f0e98b7
children c7c573f0229e
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883
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1 /*
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2 Copyright 2015 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #include <stdlib.h>
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7 #include <stdint.h>
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8 #include "arena.h"
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9
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10 struct arena {
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11 void **used_blocks;
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12 void **free_blocks;
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13
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14 size_t used_count;
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15 size_t used_storage;
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16 size_t free_count;
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17 size_t free_storage;
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18 };
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19
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20 static arena *current_arena;
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21
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22 arena *get_current_arena()
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23 {
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24 if (!current_arena) {
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25 current_arena = calloc(1, sizeof(arena));
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26 }
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27 return current_arena;
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28 }
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29
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30 arena *set_current_arena(arena *a)
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31 {
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32 arena *tmp = current_arena;
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33 current_arena = a;
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34 return tmp;
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35 }
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36
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37 arena *start_new_arena()
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38 {
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39 arena *tmp = current_arena;
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40 current_arena = NULL;
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41 return tmp;
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42 }
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43
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44 void track_block(void *block)
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45 {
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46 arena *cur = get_current_arena();
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47 if (cur->used_count == cur->used_storage) {
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48 cur->used_storage *= 2;
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49 cur->used_blocks = realloc(cur->used_blocks, cur->used_storage * sizeof(void *));
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50 }
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51 cur->used_blocks[cur->used_count++] = block;
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52 }
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53
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54 void mark_all_free()
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55 {
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56 arena *cur = get_current_arena();
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57 if (!cur->free_blocks) {
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58 cur->free_blocks = cur->used_blocks;
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59 cur->free_storage = cur->used_storage;
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60 cur->free_count = cur->used_count;
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61 cur->used_count = cur->used_storage = 0;
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62 cur->used_blocks = NULL;
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63 } else {
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64 if (cur->free_storage < cur->used_count + cur->free_count) {
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65 cur->free_storage = cur->used_count + cur->free_count;
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66 cur->free_blocks = realloc(cur->free_blocks, cur->free_storage * sizeof(void*));
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67 }
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68 for (; cur->used_count > 0; cur->used_count--)
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69 {
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70 cur->free_blocks[cur->free_count++] = cur->used_blocks[cur->used_count-1];
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71 }
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72 }
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73 }
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74
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75 void *try_alloc_arena()
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76 {
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77 if (!current_arena || !current_arena->free_count) {
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78 return NULL;
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79 }
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80 return current_arena->free_blocks[--current_arena->free_count];
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81 }