Willy Tarreau | 374b442 | 2020-06-02 17:46:16 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * include/haproxy/xref-t.h |
| 3 | * Atomic cross-references between two elements - types |
| 4 | * |
| 5 | * Copyright (C) 2017 Thierry Fournier <thierry.fournier@ozon.io> |
| 6 | * Copyright (C) 2020 Willy Tarreau - w@1wt.eu |
| 7 | * |
| 8 | * Permission is hereby granted, free of charge, to any person obtaining |
| 9 | * a copy of this software and associated documentation files (the |
| 10 | * "Software"), to deal in the Software without restriction, including |
| 11 | * without limitation the rights to use, copy, modify, merge, publish, |
| 12 | * distribute, sublicense, and/or sell copies of the Software, and to |
| 13 | * permit persons to whom the Software is furnished to do so, subject to |
| 14 | * the following conditions: |
| 15 | * |
| 16 | * The above copyright notice and this permission notice shall be |
| 17 | * included in all copies or substantial portions of the Software. |
| 18 | * |
| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 20 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES |
| 21 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 22 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
| 23 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 24 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 25 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 26 | * OTHER DEALINGS IN THE SOFTWARE. |
| 27 | */ |
| 28 | #ifndef __HAPROXY_XREF_T_H__ |
| 29 | #define __HAPROXY_XREF_T_H__ |
| 30 | |
| 31 | /* xref is used to create relation between two elements. |
| 32 | * Once an element is released, it breaks the relation. If the |
| 33 | * relation is already broken, it frees the xref struct. |
| 34 | * The pointer between two elements is sort of a refcount with |
| 35 | * max value 1. The relation is only between two elements. |
| 36 | * The pointer and the type of elements a and b are conventional. |
| 37 | */ |
| 38 | |
| 39 | #define XREF_BUSY ((struct xref *)1) |
| 40 | |
| 41 | struct xref { |
| 42 | struct xref *peer; |
| 43 | }; |
| 44 | |
| 45 | #endif /* __HAPROXY_XREF_T_H__ */ |