| 1 | # Userspace RCU library licensing |
| 2 | |
| 3 | This project is compliant with the [REUSE](https://reuse.software/spec/) |
| 4 | specification, each file contains [SPDX](https://spdx.org/specifications) tags, |
| 5 | the full licenses can be found in the `LICENSES/` directory. |
| 6 | |
| 7 | |
| 8 | ## Library code |
| 9 | |
| 10 | The library part is distributed under `LGPL-2.1-or-later`. See |
| 11 | `LICENSES/LGPL-2.1-or-later.txt` for license details. Refer to the individual |
| 12 | file headers for details. |
| 13 | |
| 14 | LGPL-compatible source code can statically use the library header using : |
| 15 | |
| 16 | ```` |
| 17 | #define _LGPL_SOURCE |
| 18 | #include <urcu.h> |
| 19 | ```` |
| 20 | |
| 21 | Dynamic-only linking with the LGPL library is used if `_LGPL_SOURCE` is not |
| 22 | defined. It permits relinking with newer versions of the library, which is |
| 23 | required by the LGPL license. |
| 24 | |
| 25 | See `lgpl-relicensing.md` for details. |
| 26 | |
| 27 | |
| 28 | ## Headers |
| 29 | |
| 30 | Most headers are also distributed under `LGPL-2.1-or-later`, some include code |
| 31 | from `atomic_ops` and are distributed under `Boehm-GC` and some others are |
| 32 | distributed under `MIT`. Refer to the individual file headers for details. |
| 33 | |
| 34 | xchg() primitive has been rewritten from scratch starting from `atomic_ops 1.2` |
| 35 | which has a MIT-style license that is intended to allow use in both free and |
| 36 | proprietary software: |
| 37 | |
| 38 | ```` |
| 39 | http://www.hpl.hp.com/research/linux/atomic_ops/LICENSING.txt |
| 40 | http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/ |
| 41 | ```` |
| 42 | |
| 43 | |
| 44 | ## Tests |
| 45 | |
| 46 | Library test code is distributed under the `GPL-2.0-only` license. See |
| 47 | `LICENSES/GPL-2.0-only.txt` for license details. See headers of individual |
| 48 | files under `tests/` for details. |
| 49 | |
| 50 | |
| 51 | ## Documentation |
| 52 | |
| 53 | The documentation is distributed under the `CC-BY-4.0` license. |
| 54 | |
| 55 | |
| 56 | ## Build system |
| 57 | |
| 58 | Build system related files are mostly distributed under the `MIT` license. See |
| 59 | headers of individual files for details. |
| 60 | |
| 61 | |
| 62 | ## Generated data files |
| 63 | |
| 64 | Generated data files are distributed under the `CC-1.0` license. |