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
|
/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2006 Brian Paul 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.
*/
/*
* Thread support for gl dispatch.
*
* Initial version by John Stone (j.stone@acm.org) (johns@cs.umr.edu)
* and Christoph Poliwoda (poliwoda@volumegraphics.com)
* Revised by Keith Whitwell
* Adapted for new gl dispatcher by Brian Paul
* Modified for use in mapi by Chia-I Wu
*/
/*
* If this file is accidentally included by a non-threaded build,
* it should not cause the build to fail, or otherwise cause problems.
* In general, it should only be included when needed however.
*/
#ifndef _U_THREAD_H_
#define _U_THREAD_H_
#include <stdio.h>
#include <stdlib.h>
#include "u_compiler.h"
#include "c11/threads.h"
#if defined(HAVE_PTHREAD) || defined(_WIN32)
#ifndef THREADS
#define THREADS
#endif
#endif
/*
* Error messages
*/
#define INIT_TSD_ERROR "_glthread_: failed to allocate key for thread specific data"
#define GET_TSD_ERROR "_glthread_: failed to get thread specific data"
#define SET_TSD_ERROR "_glthread_: thread failed to set thread specific data"
/*
* Magic number to determine if a TSD object has been initialized.
* Kind of a hack but there doesn't appear to be a better cross-platform
* solution.
*/
#define INIT_MAGIC 0xff8adc98
#ifdef __cplusplus
extern "C" {
#endif
struct u_tsd {
tss_t key;
unsigned initMagic;
};
static INLINE unsigned long
u_thread_self(void)
{
/*
* XXX: Callers of u_thread_self assume it is a lightweight function,
* returning a numeric value. But unfortunately C11's thrd_current() gives
* no such guarantees. In fact, it's pretty hard to have a compliant
* implementation of thrd_current() on Windows with such characteristics.
* So for now, we side-step this mess and use Windows thread primitives
* directly here.
*
* FIXME: On the other hand, u_thread_self() is a bad
* abstraction. Even with pthreads, there is no guarantee that
* pthread_self() will return numeric IDs -- we should be using
* pthread_equal() instead of assuming we can compare thread ids...
*/
#ifdef _WIN32
return GetCurrentThreadId();
#else
return (unsigned long) (uintptr_t) thrd_current();
#endif
}
static INLINE void
u_tsd_init(struct u_tsd *tsd)
{
if (tss_create(&tsd->key, NULL/*free*/) != 0) {
perror(INIT_TSD_ERROR);
exit(-1);
}
tsd->initMagic = INIT_MAGIC;
}
static INLINE void *
u_tsd_get(struct u_tsd *tsd)
{
if (tsd->initMagic != INIT_MAGIC) {
u_tsd_init(tsd);
}
return tss_get(tsd->key);
}
static INLINE void
u_tsd_set(struct u_tsd *tsd, void *ptr)
{
if (tsd->initMagic != INIT_MAGIC) {
u_tsd_init(tsd);
}
if (tss_set(tsd->key, ptr) != 0) {
perror(SET_TSD_ERROR);
exit(-1);
}
}
static INLINE void
u_tsd_destroy(struct u_tsd *tsd)
{
if (tsd->initMagic != INIT_MAGIC) {
return;
}
tss_delete(tsd->key);
tsd->initMagic = 0x0;
}
#ifdef __cplusplus
}
#endif
#endif /* _U_THREAD_H_ */
|
