Mercurial > repos > blastem
view arena.c @ 1356:4d16c09210fd
Fix resampling code to deal with case in which output frequency is greater than the input frequency. Probably could stand to be improved, but at least it doesn't cause the emulator to deadlock
author | Michael Pavone <pavone@retrodev.com> |
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date | Thu, 11 May 2017 07:51:28 -0700 |
parents | 4b8ab2d82aee |
children |
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/* Copyright 2015 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #include <stdlib.h> #include <stdint.h> #include "arena.h" struct arena { void **used_blocks; void **free_blocks; size_t used_count; size_t used_storage; size_t free_count; size_t free_storage; }; #define DEFAULT_STORAGE_SIZE 8 static arena *current_arena; arena *get_current_arena() { if (!current_arena) { current_arena = calloc(1, sizeof(arena)); } return current_arena; } arena *set_current_arena(arena *a) { arena *tmp = current_arena; current_arena = a; return tmp; } arena *start_new_arena() { arena *tmp = current_arena; current_arena = NULL; return tmp; } void track_block(void *block) { arena *cur = get_current_arena(); if (cur->used_count == cur->used_storage) { if (cur->used_storage) { cur->used_storage *= 2; } else { cur->used_storage = DEFAULT_STORAGE_SIZE; } cur->used_blocks = realloc(cur->used_blocks, cur->used_storage * sizeof(void *)); } cur->used_blocks[cur->used_count++] = block; } void mark_all_free() { arena *cur = get_current_arena(); if (!cur->free_blocks) { cur->free_blocks = cur->used_blocks; cur->free_storage = cur->used_storage; cur->free_count = cur->used_count; cur->used_count = cur->used_storage = 0; cur->used_blocks = NULL; } else { if (cur->free_storage < cur->used_count + cur->free_count) { cur->free_storage = cur->used_count + cur->free_count; cur->free_blocks = realloc(cur->free_blocks, cur->free_storage * sizeof(void*)); } for (; cur->used_count > 0; cur->used_count--) { cur->free_blocks[cur->free_count++] = cur->used_blocks[cur->used_count-1]; } } } void *try_alloc_arena() { if (!current_arena || !current_arena->free_count) { return NULL; } void *ret = current_arena->free_blocks[--current_arena->free_count]; track_block(ret); return ret; }