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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>
#include <pthread.h>
#include <sys/mman.h>
#include "log.h"
#include "mutex.h"
#include "arch/arch.h"
#include "os/os.h"
#include "helpers.h"
void fio_mutex_remove(struct fio_mutex *mutex)
{
close(mutex->mutex_fd);
munmap((void *) mutex, sizeof(*mutex));
}
struct fio_mutex *fio_mutex_init(int value)
{
char mutex_name[] = "/tmp/.fio_mutex.XXXXXX";
struct fio_mutex *mutex = NULL;
pthread_mutexattr_t attr;
pthread_condattr_t cond;
int fd, ret, mflag;
fd = mkstemp(mutex_name);
if (fd < 0) {
perror("open mutex");
return NULL;
}
if (ftruncate(fd, sizeof(struct fio_mutex)) < 0) {
perror("ftruncate mutex");
goto err;
}
mutex = (void *) mmap(NULL, sizeof(struct fio_mutex),
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (mutex == MAP_FAILED) {
perror("mmap mutex");
close(fd);
mutex = NULL;
goto err;
}
unlink(mutex_name);
mutex->mutex_fd = fd;
mutex->value = value;
/*
* Not all platforms support process shared mutexes (FreeBSD)
*/
#ifdef FIO_HAVE_PSHARED_MUTEX
mflag = PTHREAD_PROCESS_SHARED;
#else
mflag = PTHREAD_PROCESS_PRIVATE;
#endif
ret = pthread_mutexattr_init(&attr);
if (ret) {
log_err("pthread_mutexattr_init: %s\n", strerror(ret));
goto err;
}
#ifdef FIO_HAVE_PSHARED_MUTEX
ret = pthread_mutexattr_setpshared(&attr, mflag);
if (ret) {
log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret));
goto err;
}
#endif
pthread_condattr_init(&cond);
#ifdef FIO_HAVE_PSHARED_MUTEX
pthread_condattr_setpshared(&cond, mflag);
#endif
pthread_cond_init(&mutex->cond, &cond);
ret = pthread_mutex_init(&mutex->lock, &attr);
if (ret) {
log_err("pthread_mutex_init: %s\n", strerror(ret));
goto err;
}
return mutex;
err:
if (mutex)
fio_mutex_remove(mutex);
unlink(mutex_name);
return NULL;
}
int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds)
{
struct timespec t;
int ret = 0;
clock_gettime(CLOCK_REALTIME, &t);
t.tv_sec += seconds;
pthread_mutex_lock(&mutex->lock);
while (!mutex->value && !ret) {
mutex->waiters++;
ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t);
mutex->waiters--;
}
if (!ret) {
mutex->value--;
pthread_mutex_unlock(&mutex->lock);
}
return ret;
}
void fio_mutex_down(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);
while (!mutex->value) {
mutex->waiters++;
pthread_cond_wait(&mutex->cond, &mutex->lock);
mutex->waiters--;
}
mutex->value--;
pthread_mutex_unlock(&mutex->lock);
}
void fio_mutex_up(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);
read_barrier();
if (!mutex->value && mutex->waiters)
pthread_cond_signal(&mutex->cond);
mutex->value++;
pthread_mutex_unlock(&mutex->lock);
}
void fio_mutex_down_write(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);
while (mutex->value != 0) {
mutex->waiters++;
pthread_cond_wait(&mutex->cond, &mutex->lock);
mutex->waiters--;
}
mutex->value--;
pthread_mutex_unlock(&mutex->lock);
}
void fio_mutex_down_read(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);
while (mutex->value < 0) {
mutex->waiters++;
pthread_cond_wait(&mutex->cond, &mutex->lock);
mutex->waiters--;
}
mutex->value++;
pthread_mutex_unlock(&mutex->lock);
}
void fio_mutex_up_read(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);
mutex->value--;
read_barrier();
if (mutex->value >= 0 && mutex->waiters)
pthread_cond_signal(&mutex->cond);
pthread_mutex_unlock(&mutex->lock);
}
void fio_mutex_up_write(struct fio_mutex *mutex)
{
pthread_mutex_lock(&mutex->lock);
mutex->value++;
read_barrier();
if (mutex->value >= 0 && mutex->waiters)
pthread_cond_signal(&mutex->cond);
pthread_mutex_unlock(&mutex->lock);
}
|
