blob: 97c9c2803f3525deeb6761668fb119b7847f8712 (
plain)
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
|
/*-
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
/*
* Condition variables:
*
* WiredTiger uses standard pthread condition variables to signal between
* threads, and for locking operations that are expected to block.
*/
struct __wt_condvar {
const char *name; /* Mutex name for debugging */
pthread_mutex_t mtx; /* Mutex */
pthread_cond_t cond; /* Condition variable */
int waiters; /* Numbers of waiters, or
-1 if signalled with no waiters. */
};
/*
* Read/write locks:
*
* WiredTiger uses standard pthread rwlocks to get shared and exclusive access
* to resources.
*/
struct __wt_rwlock {
const char *name; /* Lock name for debugging */
pthread_rwlock_t rwlock; /* Read/write lock */
#ifdef _WIN32
uint32_t exclusive_locked;
#endif
};
/*
* Spin locks:
*
* These used for cases where fast mutual exclusion is needed (where operations
* done while holding the spin lock are expected to complete in a small number
* of instructions).
*/
#define SPINLOCK_GCC 0
#define SPINLOCK_PTHREAD_MUTEX 1
#define SPINLOCK_PTHREAD_MUTEX_ADAPTIVE 2
#define SPINLOCK_PTHREAD_MUTEX_LOGGING 3
#define SPINLOCK_MSVC 4
#if SPINLOCK_TYPE == SPINLOCK_GCC
typedef volatile int
WT_SPINLOCK WT_GCC_ATTRIBUTE((aligned(WT_CACHE_LINE_ALIGNMENT)));
#elif SPINLOCK_TYPE == SPINLOCK_PTHREAD_MUTEX ||\
SPINLOCK_TYPE == SPINLOCK_PTHREAD_MUTEX_ADAPTIVE ||\
SPINLOCK_TYPE == SPINLOCK_MSVC ||\
SPINLOCK_TYPE == SPINLOCK_PTHREAD_MUTEX_LOGGING
typedef struct {
pthread_mutex_t lock;
uint64_t counter; /* Statistics: counter */
const char *name; /* Statistics: mutex name */
int8_t id; /* Statistics: current holder ID */
int8_t initialized; /* Lock initialized, for cleanup */
} WT_SPINLOCK WT_GCC_ATTRIBUTE((aligned(WT_CACHE_LINE_ALIGNMENT)));
#else
#error Unknown spinlock type
#endif
|
