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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/**************************************************************************
*
* Copyright 1999-2006 Brian Paul
* Copyright 2008 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* @file
*
* Thread, mutex, condition variable, barrier, semaphore and
* thread-specific data functions.
*/
#ifndef OS_THREAD_H_
#define OS_THREAD_H_
#include "pipe/p_compiler.h"
#include "util/u_debug.h" /* for assert */
#include "util/u_thread.h"
#define pipe_mutex_assert_locked(mutex) \
__pipe_mutex_assert_locked(&(mutex))
static inline void
__pipe_mutex_assert_locked(mtx_t *mutex)
{
#ifdef DEBUG
/* NOTE: this would not work for recursive mutexes, but
* mtx_t doesn't support those
*/
int ret = mtx_trylock(mutex);
assert(ret == thrd_busy);
if (ret == thrd_success)
mtx_unlock(mutex);
#else
(void)mutex;
#endif
}
/*
* Semaphores
*/
typedef struct
{
mtx_t mutex;
cnd_t cond;
int counter;
} pipe_semaphore;
static inline void
pipe_semaphore_init(pipe_semaphore *sema, int init_val)
{
(void) mtx_init(&sema->mutex, mtx_plain);
cnd_init(&sema->cond);
sema->counter = init_val;
}
static inline void
pipe_semaphore_destroy(pipe_semaphore *sema)
{
mtx_destroy(&sema->mutex);
cnd_destroy(&sema->cond);
}
/** Signal/increment semaphore counter */
static inline void
pipe_semaphore_signal(pipe_semaphore *sema)
{
mtx_lock(&sema->mutex);
sema->counter++;
cnd_signal(&sema->cond);
mtx_unlock(&sema->mutex);
}
/** Wait for semaphore counter to be greater than zero */
static inline void
pipe_semaphore_wait(pipe_semaphore *sema)
{
mtx_lock(&sema->mutex);
while (sema->counter <= 0) {
cnd_wait(&sema->cond, &sema->mutex);
}
sema->counter--;
mtx_unlock(&sema->mutex);
}
/*
* Thread-specific data.
*/
typedef struct {
tss_t key;
int initMagic;
} pipe_tsd;
#define PIPE_TSD_INIT_MAGIC 0xff8adc98
static inline void
pipe_tsd_init(pipe_tsd *tsd)
{
if (tss_create(&tsd->key, NULL/*free*/) != 0) {
exit(-1);
}
tsd->initMagic = PIPE_TSD_INIT_MAGIC;
}
static inline void *
pipe_tsd_get(pipe_tsd *tsd)
{
if (tsd->initMagic != (int) PIPE_TSD_INIT_MAGIC) {
pipe_tsd_init(tsd);
}
return tss_get(tsd->key);
}
static inline void
pipe_tsd_set(pipe_tsd *tsd, void *value)
{
if (tsd->initMagic != (int) PIPE_TSD_INIT_MAGIC) {
pipe_tsd_init(tsd);
}
if (tss_set(tsd->key, value) != 0) {
exit(-1);
}
}
/*
* Thread statistics.
*/
/* Return the time of the current thread's CPU time clock. */
static inline int64_t
pipe_current_thread_get_time_nano(void)
{
return u_thread_get_time_nano(thrd_current());
}
#endif /* OS_THREAD_H_ */
|
