mirror of
https://github.com/VincentWei/MiniGUI.git
synced 2026-10-01 12:23:22 +08:00
156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/*
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* This file is part of MiniGUI, a mature cross-platform windowing
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* and Graphics User Interface (GUI) support system for embedded systems
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* and smart IoT devices.
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*
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* Copyright (C) 2002~2018, Beijing FMSoft Technologies Co., Ltd.
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* Copyright (C) 1998~2002, WEI Yongming
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Or,
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*
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* As this program is a library, any link to this program must follow
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* GNU General Public License version 3 (GPLv3). If you cannot accept
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* GPLv3, you need to be licensed from FMSoft.
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*
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* If you have got a commercial license of this program, please use it
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* under the terms and conditions of the commercial license.
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*
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* For more information about the commercial license, please refer to
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* <http://www.minigui.com/en/about/licensing-policy/>.
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*/
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/*
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** blockheap.c: The heap of block data.
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**
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** Current maintainer: Wei Yongming.
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**
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** Create date: 2001/01/10
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "common.h"
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#include "minigui.h"
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#include "gdi.h"
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#include "blockheap.h"
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void InitBlockDataHeap (PBLOCKHEAP heap, size_t bd_size, size_t heap_size)
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{
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#ifdef _MGRM_THREADS
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pthread_mutex_init (&heap->lock, NULL);
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#endif
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heap->heap = NULL;
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heap->bd_size = bd_size + sizeof (DWORD);
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heap->heap_size = heap_size;
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}
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void* BlockDataAlloc (PBLOCKHEAP heap)
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{
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int i;
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char* block_data = NULL;
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#ifdef _MGRM_THREADS
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pthread_mutex_lock (&heap->lock);
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#endif
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if (heap->heap == NULL) {
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if (!(heap->heap = calloc (heap->heap_size, heap->bd_size)))
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goto ret;
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heap->free = 0;
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}
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block_data = (char*) heap->heap + heap->bd_size*heap->free;
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for (i = heap->free; i < heap->heap_size; i++) {
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if (*((DWORD*)block_data) == BDS_FREE) {
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heap->free = i + 1;
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*((DWORD*)block_data) = BDS_USED;
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#if 0
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fprintf (stderr, "heap: %p, Allocated: %d, free: %d.\n", heap, i, heap->free);
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fprintf (stderr, "Heap: (bd_size: %d, heap_size: %d, heap: %p).\n",
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heap->bd_size, heap->heap_size, heap->heap);
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#endif
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goto ret;
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}
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block_data += heap->bd_size;
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}
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if (!(block_data = calloc (1, heap->bd_size)))
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goto ret;
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*((DWORD*)block_data) = BDS_SPECIAL;
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ret:
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#ifdef _MGRM_THREADS
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pthread_mutex_unlock (&heap->lock);
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#endif
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if (block_data)
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return block_data + sizeof (DWORD);
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return NULL;
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}
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void BlockDataFree (PBLOCKHEAP heap, void* data)
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{
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int i;
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char* block_data;
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#ifdef _MGRM_THREADS
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pthread_mutex_lock (&heap->lock);
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#endif
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block_data = (char*) data - sizeof (DWORD);
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if (*((DWORD*)block_data) == BDS_SPECIAL)
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free (block_data);
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else if (*((DWORD*)block_data) == BDS_USED) {
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*((DWORD*)block_data) = BDS_FREE;
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i = (block_data - (char*)heap->heap)/heap->bd_size;
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if (heap->free > i)
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heap->free = i;
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#if 0
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fprintf (stderr, "Heap: %p: Freed: %d, free: %d.\n", heap, i, heap->free);
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fprintf (stderr, "Heap: (bd_size: %d, heap_size: %d, heap: %p).\n",
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heap->bd_size, heap->heap_size, heap->heap);
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#endif
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}
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#ifdef _MGRM_THREADS
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pthread_mutex_unlock (&heap->lock);
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#endif
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}
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void DestroyBlockDataHeap (PBLOCKHEAP heap)
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{
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#if 0
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fprintf (stderr, "Heap: (bd_size: %d, heap_size: %d, heap: %p).\n",
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heap->bd_size, heap->heap_size, heap->heap);
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#endif
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#ifdef _MGRM_THREADS
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pthread_mutex_destroy (&heap->lock);
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#endif
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free (heap->heap);
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}
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