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
|
/*-
* Public Domain 2014-2019 MongoDB, Inc.
* Public Domain 2008-2014 WiredTiger, Inc.
*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* 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 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.
*
* ex_async.c
* demonstrates how to use the asynchronous API.
*/
#include <test_util.h>
static const char *home;
#if defined(_lint)
#define ATOMIC_ADD(v, val) ((v) += (val), (v))
#elif defined(_WIN32)
#define ATOMIC_ADD(v, val) (_InterlockedExchangeAdd(&(v), val) + val)
#else
#define ATOMIC_ADD(v, val) __atomic_add_fetch(&(v), val, __ATOMIC_SEQ_CST)
#endif
static int global_error = 0;
/*! [async example callback implementation] */
typedef struct {
WT_ASYNC_CALLBACK iface;
uint32_t num_keys;
} ASYNC_KEYS;
static int
async_callback(WT_ASYNC_CALLBACK *cb, WT_ASYNC_OP *op, int wiredtiger_error, uint32_t flags)
{
ASYNC_KEYS *asynckey = (ASYNC_KEYS *)cb;
WT_ASYNC_OPTYPE type;
WT_ITEM k, v;
const char *key, *value;
uint64_t id;
(void)flags; /* Unused */
/*! [async get type] */
/* Retrieve the operation's WT_ASYNC_OPTYPE type. */
type = op->get_type(op);
/*! [async get type] */
/*! [async get identifier] */
/* Retrieve the operation's 64-bit identifier. */
id = op->get_id(op);
/*! [async get identifier] */
/* Check for a WiredTiger error. */
if (wiredtiger_error != 0) {
fprintf(stderr, "ID %" PRIu64 " error %d: %s\n", id, wiredtiger_error,
wiredtiger_strerror(wiredtiger_error));
global_error = wiredtiger_error;
return (1);
}
/* If doing a search, retrieve the key/value pair. */
if (type == WT_AOP_SEARCH) {
/*! [async get the operation's string key] */
error_check(op->get_key(op, &k));
key = k.data;
/*! [async get the operation's string key] */
/*! [async get the operation's string value] */
error_check(op->get_value(op, &v));
value = v.data;
/*! [async get the operation's string value] */
ATOMIC_ADD(asynckey->num_keys, 1);
printf("Id %" PRIu64 " got record: %s : %s\n", id, key, value);
}
return (0);
}
/*! [async example callback implementation] */
static ASYNC_KEYS ex_asynckeys = {{async_callback}, 0};
#define MAX_KEYS 15
int
main(int argc, char *argv[])
{
WT_ASYNC_OP *op;
WT_CONNECTION *conn;
WT_SESSION *session;
int i, ret;
char k[MAX_KEYS][16], v[MAX_KEYS][16];
home = example_setup(argc, argv);
/*! [async example connection] */
error_check(wiredtiger_open(home, NULL,
"create,cache_size=100MB,"
"async=(enabled=true,ops_max=20,threads=2)",
&conn));
/*! [async example connection] */
/*! [async example table create] */
error_check(conn->open_session(conn, NULL, NULL, &session));
error_check(session->create(session, "table:async", "key_format=S,value_format=S"));
/*! [async example table create] */
/* Insert a set of keys asynchronously. */
for (i = 0; i < MAX_KEYS; i++) {
/*! [async handle allocation] */
while (
(ret = conn->async_new_op(conn, "table:async", NULL, &ex_asynckeys.iface, &op)) != 0) {
/*
* If we used up all the handles, pause and retry to give the workers a chance to catch
* up.
*/
fprintf(stderr, "asynchronous operation handle not available\n");
if (ret == EBUSY)
sleep(1);
else
return (EXIT_FAILURE);
}
/*! [async handle allocation] */
/*! [async insert] */
/*
* Set the operation's string key and value, and then do an asynchronous insert.
*/
/*! [async set the operation's string key] */
(void)snprintf(k[i], sizeof(k), "key%d", i);
op->set_key(op, k[i]);
/*! [async set the operation's string key] */
/*! [async set the operation's string value] */
(void)snprintf(v[i], sizeof(v), "value%d", i);
op->set_value(op, v[i]);
/*! [async set the operation's string value] */
error_check(op->insert(op));
/*! [async insert] */
}
/*! [async flush] */
/* Wait for all outstanding operations to complete. */
error_check(conn->async_flush(conn));
/*! [async flush] */
/*! [async compaction] */
/*
* Compact a table asynchronously, limiting the run-time to 5 minutes.
*/
error_check(conn->async_new_op(conn, "table:async", "timeout=300", &ex_asynckeys.iface, &op));
error_check(op->compact(op));
/*! [async compaction] */
/* Search for the keys we just inserted, asynchronously. */
for (i = 0; i < MAX_KEYS; i++) {
while (
(ret = conn->async_new_op(conn, "table:async", NULL, &ex_asynckeys.iface, &op)) != 0) {
/*
* If we used up all the handles, pause and retry to give the workers a chance to catch
* up.
*/
fprintf(stderr, "asynchronous operation handle not available\n");
if (ret == EBUSY)
sleep(1);
else
return (EXIT_FAILURE);
}
/*! [async search] */
/*
* Set the operation's string key and value, and then do an asynchronous search.
*/
(void)snprintf(k[i], sizeof(k), "key%d", i);
op->set_key(op, k[i]);
error_check(op->search(op));
/*! [async search] */
}
/*
* Connection close automatically does an async_flush so it will wait for all queued search
* operations to complete.
*/
error_check(conn->close(conn, NULL));
printf("Searched for %" PRIu32 " keys\n", ex_asynckeys.num_keys);
return (EXIT_SUCCESS);
}
|
