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
|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2009-2010. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Author: Rickard Green
*/
#if defined(ETHR_HAVE_LINUX_FUTEX) && defined(ETHR_HAVE_NATIVE_ATOMICS)
/* --- Linux futex implementation of ethread events ------------------------- */
#define ETHR_LINUX_FUTEX_IMPL__
#include <sys/syscall.h>
#include <unistd.h>
#include <linux/futex.h>
#include <sys/time.h>
#define ETHR_EVENT_OFF_WAITER__ ((ethr_sint32_t) -1)
#define ETHR_EVENT_OFF__ ((ethr_sint32_t) 1)
#define ETHR_EVENT_ON__ ((ethr_sint32_t) 0)
#if defined(FUTEX_WAIT_PRIVATE) && defined(FUTEX_WAKE_PRIVATE)
# define ETHR_FUTEX_WAIT__ FUTEX_WAIT_PRIVATE
# define ETHR_FUTEX_WAKE__ FUTEX_WAKE_PRIVATE
#else
# define ETHR_FUTEX_WAIT__ FUTEX_WAIT
# define ETHR_FUTEX_WAKE__ FUTEX_WAKE
#endif
typedef struct {
ethr_atomic32_t futex;
} ethr_event;
#define ETHR_FUTEX__(FTX, OP, VAL) \
(-1 == syscall(__NR_futex, \
(void *) ethr_atomic32_addr((FTX)), \
(OP), \
(int) (VAL), \
NULL, \
NULL, \
0) \
? errno : 0)
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_EVENT_IMPL__)
static void ETHR_INLINE
ETHR_INLINE_FUNC_NAME_(ethr_event_set)(ethr_event *e)
{
ethr_sint32_t val;
ETHR_WRITE_MEMORY_BARRIER;
val = ethr_atomic32_xchg(&e->futex, ETHR_EVENT_ON__);
if (val == ETHR_EVENT_OFF_WAITER__) {
int res = ETHR_FUTEX__(&e->futex, ETHR_FUTEX_WAKE__, 1);
if (res != 0)
ETHR_FATAL_ERROR__(res);
}
}
static void ETHR_INLINE
ETHR_INLINE_FUNC_NAME_(ethr_event_reset)(ethr_event *e)
{
ethr_atomic32_set(&e->futex, ETHR_EVENT_OFF__);
ETHR_MEMORY_BARRIER;
}
#endif
#elif defined(ETHR_PTHREADS)
/* --- Posix mutex/cond implementation of events ---------------------------- */
typedef struct {
ethr_atomic32_t state;
pthread_mutex_t mtx;
pthread_cond_t cnd;
} ethr_event;
#define ETHR_EVENT_OFF_WAITER__ -1L
#define ETHR_EVENT_OFF__ 1L
#define ETHR_EVENT_ON__ 0L
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_EVENT_IMPL__)
static void ETHR_INLINE
ETHR_INLINE_FUNC_NAME_(ethr_event_set)(ethr_event *e)
{
ethr_sint32_t val;
ETHR_WRITE_MEMORY_BARRIER;
val = ethr_atomic32_xchg(&e->state, ETHR_EVENT_ON__);
if (val == ETHR_EVENT_OFF_WAITER__) {
int res = pthread_mutex_lock(&e->mtx);
if (res != 0)
ETHR_FATAL_ERROR__(res);
res = pthread_cond_signal(&e->cnd);
if (res != 0)
ETHR_FATAL_ERROR__(res);
res = pthread_mutex_unlock(&e->mtx);
if (res != 0)
ETHR_FATAL_ERROR__(res);
}
}
static void ETHR_INLINE
ETHR_INLINE_FUNC_NAME_(ethr_event_reset)(ethr_event *e)
{
ethr_atomic32_set(&e->state, ETHR_EVENT_OFF__);
ETHR_MEMORY_BARRIER;
}
#endif
#endif
int ethr_event_init(ethr_event *e);
int ethr_event_destroy(ethr_event *e);
int ethr_event_wait(ethr_event *e);
int ethr_event_swait(ethr_event *e, int spincount);
#if !defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_EVENT_IMPL__)
void ethr_event_set(ethr_event *e);
void ethr_event_reset(ethr_event *e);
#endif
|
