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1 /*
2 * Copyright (c) 2009
3 * The President and Fellows of Harvard College.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef _CURRENT_H_
31 #define _CURRENT_H_
32
33 /*
34 * Definition of curcpu and curthread.
35 *
36 * The machine-dependent header should define either curcpu or curthread
37 * as a macro (but not both); then we use one to get the other, and include
38 * the header file needed to make that reference. (These includes are why
39 * this file isn't rolled into either cpu.h or thread.h.)
40 */
41
42 #include <machine/current.h>
43
44 #if defined(__NEED_CURTHREAD)
45
46 #include <cpu.h>
47 #define curthread curcpu->c_curthread
48 #define CURCPU_EXISTS() (curcpu != NULL)
49
50 #endif
51
52 #if defined(__NEED_CURCPU)
53
54 #include <thread.h>
55 #define curcpu curthread->t_cpu
56 #define CURCPU_EXISTS() (curthread != NULL)
57
58 #endif
59
60 /*
61 * Definition of curproc.
62 *
63 * curproc is always the current thread's process.
64 */
65
66 #define curproc (curthread->t_proc)
67
68
69 #endif /* _CURRENT_H_ */