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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
|
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include <pthread.h>
#include <sys/mman.h>
#include <assert.h>
#include "fio.h"
#include "log.h"
#include "mutex.h"
#include "arch/arch.h"
#include "os/os.h"
#include "helpers.h"
#include "fio_time.h"
#include "gettime.h"
void __fio_mutex_remove(struct fio_mutex *mutex)
{
assert(mutex->magic == FIO_MUTEX_MAGIC);
pthread_cond_destroy(&mutex->cond);
}
void fio_mutex_remove(struct fio_mutex *mutex)
{
__fio_mutex_remove(mutex);
munmap((void *) mutex, sizeof(*mutex));
}
int __fio_mutex_init(struct fio_mutex *mutex, int value)
{
pthread_mutexattr_t attr;
pthread_condattr_t cond;
int ret;
mutex->value = value;
mutex->magic = FIO_MUTEX_MAGIC;
ret = pthread_mutexattr_init(&attr);
if (ret) {
log_err("pthread_mutexattr_init: %s\n", strerror(ret));
return ret;
}
/*
* Not all platforms support process shared mutexes (FreeBSD)
*/
#ifdef FIO_HAVE_PSHARED_MUTEX
ret = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
if (ret) {
log_err("pthread_mutexattr_setpshared: %s\n", strerror(ret));
return ret;
}
#endif
pthread_condattr_init(&cond);
#ifdef FIO_HAVE_PSHARED_MUTEX
pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED);
#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));
return ret;
}
pthread_condattr_destroy(&cond);
pthread_mutexattr_destroy(&attr);
return 0;
}
struct fio_mutex *fio_mutex_init(int value)
{
struct fio_mutex *mutex = NULL;
mutex = (void *) mmap(NULL, sizeof(struct fio_mutex),
PROT_READ | PROT_WRITE,
OS_MAP_ANON | MAP_SHARED, -1, 0);
if (mutex == MAP_FAILED) {
perror("mmap mutex");
return NULL;
}
if (!__fio_mutex_init(mutex, value))
return mutex;
fio_mutex_remove(mutex);
return NULL;
}
static int mutex_timed_out(struct timeval *t, unsigned int seconds)
{
return mtime_since_now(t) >= seconds * 1000;
}
int fio_mutex_down_timeout(struct fio_mutex *mutex, unsigned int seconds)
{
struct timeval tv_s;
struct timespec t;
int ret = 0;
assert(mutex->magic == FIO_MUTEX_MAGIC);
gettimeofday(&tv_s, NULL);
t.tv_sec = tv_s.tv_sec + seconds;
t.tv_nsec = tv_s.tv_usec * 1000;
pthread_mutex_lock(&mutex->lock);
while (!mutex->value && !ret) {
mutex->waiters++;
/*
* Some platforms (FreeBSD 9?) seems to return timed out
* way too early, double check.
*/
ret = pthread_cond_timedwait(&mutex->cond, &mutex->lock, &t);
if (ret == ETIMEDOUT && !mutex_timed_out(&tv_s, seconds))
ret = 0;
mutex->waiters--;
}
if (!ret) {
mutex->value--;
pthread_mutex_unlock(&mutex->lock);
}
return ret;
}
int fio_mutex_down_trylock(struct fio_mutex *mutex)
{
int ret = 1;
assert(mutex->magic == FIO_MUTEX_MAGIC);
pthread_mutex_lock(&mutex->lock);
if (mutex->value) {
mutex->value--;
ret = 0;
}
pthread_mutex_unlock(&mutex->lock);
return ret;
}
void fio_mutex_down(struct fio_mutex *mutex)
{
assert(mutex->magic == FIO_MUTEX_MAGIC);
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)
{
int do_wake = 0;
assert(mutex->magic == FIO_MUTEX_MAGIC);
pthread_mutex_lock(&mutex->lock);
read_barrier();
if (!mutex->value && mutex->waiters)
do_wake = 1;
mutex->value++;
pthread_mutex_unlock(&mutex->lock);
if (do_wake)
pthread_cond_signal(&mutex->cond);
}
void fio_rwlock_write(struct fio_rwlock *lock)
{
assert(lock->magic == FIO_RWLOCK_MAGIC);
pthread_rwlock_wrlock(&lock->lock);
}
void fio_rwlock_read(struct fio_rwlock *lock)
{
assert(lock->magic == FIO_RWLOCK_MAGIC);
pthread_rwlock_rdlock(&lock->lock);
}
void fio_rwlock_unlock(struct fio_rwlock *lock)
{
assert(lock->magic == FIO_RWLOCK_MAGIC);
pthread_rwlock_unlock(&lock->lock);
}
void fio_rwlock_remove(struct fio_rwlock *lock)
{
assert(lock->magic == FIO_RWLOCK_MAGIC);
munmap((void *) lock, sizeof(*lock));
}
struct fio_rwlock *fio_rwlock_init(void)
{
struct fio_rwlock *lock;
pthread_rwlockattr_t attr;
int ret;
lock = (void *) mmap(NULL, sizeof(struct fio_rwlock),
PROT_READ | PROT_WRITE,
OS_MAP_ANON | MAP_SHARED, -1, 0);
if (lock == MAP_FAILED) {
perror("mmap rwlock");
lock = NULL;
goto err;
}
lock->magic = FIO_RWLOCK_MAGIC;
ret = pthread_rwlockattr_init(&attr);
if (ret) {
log_err("pthread_rwlockattr_init: %s\n", strerror(ret));
goto err;
}
#ifdef FIO_HAVE_PSHARED_MUTEX
ret = pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
if (ret) {
log_err("pthread_rwlockattr_setpshared: %s\n", strerror(ret));
goto destroy_attr;
}
ret = pthread_rwlock_init(&lock->lock, &attr);
#else
ret = pthread_rwlock_init(&lock->lock, NULL);
#endif
if (ret) {
log_err("pthread_rwlock_init: %s\n", strerror(ret));
goto destroy_attr;
}
pthread_rwlockattr_destroy(&attr);
return lock;
destroy_attr:
pthread_rwlockattr_destroy(&attr);
err:
if (lock)
fio_rwlock_remove(lock);
return NULL;
}
|
