From 8901a46a742b0cfecde0b981fc65160bf3e8d019 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jos=C3=A9=20Fonseca?= Date: Wed, 12 Mar 2008 15:02:11 +0000 Subject: [PATCH] gallium: Generic handle table. --- src/gallium/auxiliary/util/Makefile | 1 + src/gallium/auxiliary/util/SConscript | 1 + src/gallium/auxiliary/util/u_handle_table.c | 207 ++++++++++++++++++++ src/gallium/auxiliary/util/u_handle_table.h | 96 +++++++++ 4 files changed, 305 insertions(+) create mode 100644 src/gallium/auxiliary/util/u_handle_table.c create mode 100644 src/gallium/auxiliary/util/u_handle_table.h diff --git a/src/gallium/auxiliary/util/Makefile b/src/gallium/auxiliary/util/Makefile index 2a3a9380b3b..2abbe9500ec 100644 --- a/src/gallium/auxiliary/util/Makefile +++ b/src/gallium/auxiliary/util/Makefile @@ -7,6 +7,7 @@ C_SOURCES = \ p_debug.c \ p_tile.c \ p_util.c \ + u_handle_table.c \ u_mm.c \ u_snprintf.c diff --git a/src/gallium/auxiliary/util/SConscript b/src/gallium/auxiliary/util/SConscript index 642088b9624..2030214aa7e 100644 --- a/src/gallium/auxiliary/util/SConscript +++ b/src/gallium/auxiliary/util/SConscript @@ -6,6 +6,7 @@ util = env.ConvenienceLibrary( 'p_debug.c', 'p_tile.c', 'p_util.c', + 'u_handle_table.c', 'u_mm.c', 'u_snprintf.c', ]) diff --git a/src/gallium/auxiliary/util/u_handle_table.c b/src/gallium/auxiliary/util/u_handle_table.c new file mode 100644 index 00000000000..8a298f7c413 --- /dev/null +++ b/src/gallium/auxiliary/util/u_handle_table.c @@ -0,0 +1,207 @@ +/************************************************************************** + * + * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ + +/** + * Generic handle table implementation. + * + * @author José Fonseca + */ + + +#include "pipe/p_compiler.h" +#include "pipe/p_debug.h" +#include "pipe/p_util.h" + +#include "u_handle_table.h" + + +#define HANDLE_TABLE_INITIAL_SIZE 16 + + +struct handle_table +{ + /** Object array. Empty handles have a null object */ + void **objects; + + /** Number of objects the handle can currently hold */ + unsigned size; + /** Number of consecutive objects allocated at the start of the table */ + unsigned filled; + + /** Optional object destructor */ + void (*destroy)(void *object); +}; + + +struct handle_table * +handle_table_create(void) +{ + struct handle_table *ht; + + ht = MALLOC_STRUCT(handle_table); + if(!ht) + return NULL; + + ht->objects = (void **)CALLOC(HANDLE_TABLE_INITIAL_SIZE, sizeof(void *)); + if(!ht->objects) { + FREE(ht); + return NULL; + } + + ht->size = HANDLE_TABLE_INITIAL_SIZE; + ht->filled = 0; + + ht->destroy = NULL; + + return ht; +} + + +void +handle_table_set_destroy(struct handle_table *ht, + void (*destroy)(void *object)) +{ + assert(ht); + ht->destroy = destroy; +} + + +unsigned +handle_table_add(struct handle_table *ht, + void *object) +{ + unsigned index; + unsigned handle; + + assert(ht); + assert(object); + if(!object) + return 0; + + /* linear search for an empty handle */ + while(ht->filled < ht->size) { + if(!ht->objects[ht->filled]) + break; + ++ht->filled; + } + + /* grow the table */ + if(ht->filled == ht->size) { + unsigned new_size; + void **new_objects; + + new_size = ht->size*2; + assert(new_size); + + new_objects = (void **)REALLOC((void *)ht->objects, + ht->size*sizeof(void *), + new_size*sizeof(void *)); + if(!new_objects) + return 0; + + memset(new_objects + ht->size, 0, (new_size - ht->size)*sizeof(void *)); + + ht->size = new_size; + ht->objects = new_objects; + } + + index = ht->filled; + + handle = index + 1; + + /* check integer overflow */ + if(!handle) + return 0; + + assert(!ht->objects[index]); + ht->objects[index] = object; + ++ht->filled; + + return handle; +} + + +void * +handle_table_get(struct handle_table *ht, + unsigned handle) +{ + void *object; + + assert(ht); + assert(handle > 0); + assert(handle <= ht->size); + if(!handle || handle > ht->size) + return NULL; + + object = ht->objects[handle - 1]; + assert(object); + + return object; +} + + +void +handle_table_remove(struct handle_table *ht, + unsigned handle) +{ + void *object; + unsigned index; + + assert(ht); + assert(handle > 0); + assert(handle <= ht->size); + if(!handle || handle > ht->size) + return; + + index = handle - 1; + object = ht->objects[index]; + assert(object); + + if(object && ht->destroy) + ht->destroy(object); + + ht->objects[index] = NULL; + if(index < ht->filled) + ht->filled = index; +} + + +void +handle_table_destroy(struct handle_table *ht) +{ + unsigned index; + assert(ht); + + if(ht->destroy) + for(index = 0; index < ht->size; ++index) + if(ht->objects[index]) + ht->destroy(ht->objects[index]); + + FREE(ht->objects); + FREE(ht); +} + diff --git a/src/gallium/auxiliary/util/u_handle_table.h b/src/gallium/auxiliary/util/u_handle_table.h new file mode 100644 index 00000000000..51fc273865f --- /dev/null +++ b/src/gallium/auxiliary/util/u_handle_table.h @@ -0,0 +1,96 @@ +/************************************************************************** + * + * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ + +/** + * Generic handle table. + * + * @author José Fonseca + */ + +#ifndef U_HANDLE_TABLE_H_ +#define U_HANDLE_TABLE_H_ + + +#ifdef __cplusplus +extern "C" { +#endif + + +/** + * Abstract data type to map integer handles to objects. + */ +struct handle_table; + + +struct handle_table * +handle_table_create(void); + + +/** + * Set an optional destructor callback. + * + * If set, it will be called during handle_table_remove and + * handle_table_destroy calls. + */ +void +handle_table_set_destroy(struct handle_table *ht, + void (*destroy)(void *object)); + + +/** + * Add a new object. + * + * Returns a zero handle on failure (out of memory). + */ +unsigned +handle_table_add(struct handle_table *ht, + void *object); + +/** + * Fetch an existing object. + * + * Returns NULL for an invalid handle. + */ +void * +handle_table_get(struct handle_table *ht, + unsigned handle); + + +void +handle_table_remove(struct handle_table *ht, + unsigned handle); + + +void +handle_table_destroy(struct handle_table *ht); + + +#ifdef __cplusplus +} +#endif + +#endif /* U_HANDLE_TABLE_H_ */