1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/* -------------------------------------------------------------- */
/* (C)Copyright 2001,2007, */
/* International Business Machines Corporation, */
/* Sony Computer Entertainment, Incorporated, */
/* Toshiba Corporation, */
/* */
/* All Rights Reserved. */
/* */
/* Redistribution and use in source and binary forms, with or */
/* without modification, are permitted provided that the */
/* following conditions are met: */
/* */
/* - Redistributions of source code must retain the above copyright*/
/* notice, this list of conditions and the following disclaimer. */
/* */
/* - Redistributions in binary form must reproduce the above */
/* copyright notice, this list of conditions and the following */
/* disclaimer in the documentation and/or other materials */
/* provided with the distribution. */
/* */
/* - Neither the name of IBM Corporation nor the names of its */
/* contributors may be used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */
/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */
/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */
/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */
/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* -------------------------------------------------------------- */
/* PROLOG END TAG zYx */
#ifndef _PPU_MUTEX_TRYLOCK_H_
#define _PPU_MUTEX_TRYLOCK_H_
#include <ppu_intrinsics.h>
#include "sync_utils.h"
#include "mutex.h"
#include "trace_libsync.h"
/**
* mutex_trylock - acquire a lock, or return immediately.
* @lock: handle to effective address of lock variable.
*
* Description: Acquire a lock, or return immediately
* without polling for availability.
*
* Context: The application should not call this interface
* from a tight loop!! Use spin_lock() instead.
*
* Attempt to immediately aquire a lock at a location in system memory,
* and return 1 if the lock was aquired or 0 otherwise.
*/
static __inline int _mutex_trylock (mutex_ea_t lock)
{
int val;
int ret = 0;
void *p;
SYNC_ULL_TO_PTR(lock, p);
do {
val = (int)__lwarx(p);
if (val) break;
} while ((ret = __stwcx(p, (unsigned int)1)) == 0);
__isync();
TRACE_MUTEX_TRYLOCK(lock,ret);
return (ret);
}
#endif /* _PPU_MUTEX_TRYLOCK_H_ */
|
