2 * Copyright 2013 Marek Olšák <maraeo@gmail.com>
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * on the rights to use, copy, modify, merge, publish, distribute, sub
8 * license, and/or sell copies of the Software, and to permit persons to whom
9 * the Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
21 * USE OR OTHER DEALINGS IN THE SOFTWARE. */
25 * 1D integer range, capable of the union and intersection operations.
27 * It only maintains a single interval which is extended when the union is
28 * done. This implementation is partially thread-safe (readers are not
29 * protected by a lock).
37 #include "os/os_thread.h"
39 #include "util/u_math.h"
42 unsigned start
; /* inclusive */
43 unsigned end
; /* exclusive */
45 /* for the range to be consistent with multiple contexts: */
51 util_range_set_empty(struct util_range
*range
)
57 /* This is like a union of two sets. */
59 util_range_add(struct util_range
*range
, unsigned start
, unsigned end
)
61 if (start
< range
->start
|| end
> range
->end
) {
62 mtx_lock(&range
->write_mutex
);
63 range
->start
= MIN2(start
, range
->start
);
64 range
->end
= MAX2(end
, range
->end
);
65 mtx_unlock(&range
->write_mutex
);
70 util_ranges_intersect(const struct util_range
*range
,
71 unsigned start
, unsigned end
)
73 return MAX2(start
, range
->start
) < MIN2(end
, range
->end
);
80 util_range_init(struct util_range
*range
)
82 (void) mtx_init(&range
->write_mutex
, mtx_plain
);
83 util_range_set_empty(range
);
87 util_range_destroy(struct util_range
*range
)
89 mtx_destroy(&range
->write_mutex
);