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| /************************************************************************** |
| * |
| * Copyright 2009 VMware, Inc. |
| * 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 VMWARE 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. |
| * |
| **************************************************************************/ |
| |
| /** |
| * @file |
| * Generic bitmask. |
| * |
| * @author Jose Fonseca <jfonseca@vmware.com> |
| */ |
| |
| #ifndef U_HANDLE_BITMASK_H_ |
| #define U_HANDLE_BITMASK_H_ |
| |
| |
| #include "pipe/p_compiler.h" |
| |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| |
| #define UTIL_BITMASK_INVALID_INDEX (~0U) |
| |
| |
| /** |
| * Abstract data type to represent arbitrary set of bits. |
| */ |
| struct util_bitmask; |
| |
| |
| struct util_bitmask * |
| util_bitmask_create(void); |
| |
| |
| /** |
| * Search a cleared bit and set it. |
| * |
| * It searches for the first cleared bit. |
| * |
| * Returns the bit index on success, or UTIL_BITMASK_INVALID_INDEX on out of |
| * memory growing the bitmask. |
| */ |
| unsigned |
| util_bitmask_add(struct util_bitmask *bm); |
| |
| /** |
| * Set a bit. |
| * |
| * Returns the input index on success, or UTIL_BITMASK_INVALID_INDEX on out of |
| * memory growing the bitmask. |
| */ |
| unsigned |
| util_bitmask_set(struct util_bitmask *bm, |
| unsigned index); |
| |
| void |
| util_bitmask_clear(struct util_bitmask *bm, |
| unsigned index); |
| |
| boolean |
| util_bitmask_get(struct util_bitmask *bm, |
| unsigned index); |
| |
| |
| void |
| util_bitmask_destroy(struct util_bitmask *bm); |
| |
| |
| /** |
| * Search for the first set bit. |
| * |
| * Returns UTIL_BITMASK_INVALID_INDEX if a set bit cannot be found. |
| */ |
| unsigned |
| util_bitmask_get_first_index(struct util_bitmask *bm); |
| |
| |
| /** |
| * Search for the first set bit, starting from the giving index. |
| * |
| * Returns UTIL_BITMASK_INVALID_INDEX if a set bit cannot be found. |
| */ |
| unsigned |
| util_bitmask_get_next_index(struct util_bitmask *bm, |
| unsigned index); |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* U_HANDLE_BITMASK_H_ */ |