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
|
/*-
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_connection_open --
* Open a connection.
*/
int
__wt_connection_open(WT_CONNECTION_IMPL *conn, const char *cfg[])
{
WT_SESSION_IMPL *session;
/* Default session. */
session = conn->default_session;
WT_ASSERT(session, session->iface.connection == &conn->iface);
/* WT_SESSION_IMPL array. */
WT_RET(__wt_calloc(session,
conn->session_size, sizeof(WT_SESSION_IMPL), &conn->sessions));
/* Create the cache. */
WT_RET(__wt_cache_create(conn, cfg));
/* Initialize transaction support. */
WT_RET(__wt_txn_global_init(conn, cfg));
/*
* Publish: there must be a barrier to ensure the connection structure
* fields are set before other threads read from the pointer.
*/
WT_WRITE_BARRIER();
/*
* Open the default session. We open this before starting service
* threads because those may allocate and use session resources that
* need to get cleaned up on close.
*/
WT_RET(__wt_open_session(conn, 1, NULL, NULL, &session));
conn->default_session = session;
return (0);
}
/*
* __wt_connection_close --
* Close a connection handle.
*/
int
__wt_connection_close(WT_CONNECTION_IMPL *conn)
{
WT_CONNECTION *wt_conn;
WT_DECL_RET;
WT_DLH *dlh;
WT_FH *fh;
WT_NAMED_COLLATOR *ncoll;
WT_NAMED_COMPRESSOR *ncomp;
WT_NAMED_DATA_SOURCE *ndsrc;
WT_SESSION_IMPL *s, *session;
u_int i;
wt_conn = &conn->iface;
session = conn->default_session;
/* We're shutting down. Make sure everything gets freed. */
__wt_txn_update_oldest(session);
/*
* Shut down server threads other than the eviction server, which is
* needed later to close btree handles. Some of these threads access
* btree handles, so take care in ordering shutdown to make sure they
* exit before files are closed.
*/
F_CLR(conn, WT_CONN_SERVER_RUN);
WT_TRET(__wt_checkpoint_destroy(conn));
WT_TRET(__wt_statlog_destroy(conn));
/* Clean up open LSM handles. */
WT_TRET(__wt_lsm_tree_close_all(session));
/* Close open data handles. */
WT_TRET(__wt_conn_dhandle_discard(conn));
/*
* Now that all data handles are closed, tell logging that a checkpoint
* has completed then shut down the log manager (only after closing
* data handles).
*/
if (conn->logging) {
WT_TRET(__wt_txn_checkpoint_log(
session, 1, WT_TXN_LOG_CKPT_STOP, NULL));
WT_TRET(__wt_logmgr_destroy(conn));
}
/* Free memory for collators */
while ((ncoll = TAILQ_FIRST(&conn->collqh)) != NULL)
WT_TRET(__wt_conn_remove_collator(conn, ncoll));
/* Free memory for compressors */
while ((ncomp = TAILQ_FIRST(&conn->compqh)) != NULL)
WT_TRET(__wt_conn_remove_compressor(conn, ncomp));
/* Free memory for data sources */
while ((ndsrc = TAILQ_FIRST(&conn->dsrcqh)) != NULL)
WT_TRET(__wt_conn_remove_data_source(conn, ndsrc));
/*
* Complain if files weren't closed, ignoring the lock and logging
* files, we'll close them in a minute.
*/
TAILQ_FOREACH(fh, &conn->fhqh, q) {
if (fh == conn->lock_fh)
continue;
__wt_errx(session,
"Connection has open file handles: %s", fh->name);
WT_TRET(__wt_close(session, fh));
fh = TAILQ_FIRST(&conn->fhqh);
}
/* Shut down the eviction server thread. */
F_CLR(conn, WT_CONN_EVICTION_RUN);
if (conn->cache_evict_tid_set) {
WT_TRET(__wt_evict_server_wake(session));
WT_TRET(__wt_thread_join(session, conn->cache_evict_tid));
conn->cache_evict_tid_set = 0;
}
/* Disconnect from shared cache - must be before cache destroy. */
WT_TRET(__wt_conn_cache_pool_destroy(conn));
/* Discard the cache. */
WT_TRET(__wt_cache_destroy(conn));
/* Discard transaction state. */
__wt_txn_global_destroy(conn);
/* Close extensions, first calling any unload entry point. */
while ((dlh = TAILQ_FIRST(&conn->dlhqh)) != NULL) {
TAILQ_REMOVE(&conn->dlhqh, dlh, q);
if (dlh->terminate != NULL)
WT_TRET(dlh->terminate(wt_conn));
WT_TRET(__wt_dlclose(session, dlh));
}
/*
* Close the internal (default) session, and switch back to the dummy
* session in case of any error messages from the remaining operations
* while destroying the connection handle.
*
* Additionally, the session's hazard pointer memory isn't discarded
* during normal session close because access to it isn't serialized.
* Discard it now.
*/
if (session != &conn->dummy_session) {
WT_TRET(session->iface.close(&session->iface, NULL));
session = conn->default_session = &conn->dummy_session;
}
/* Free the hazard pointers for all sessions. */
if ((s = conn->sessions) != NULL)
for (i = 0; i < conn->session_size; ++s, ++i)
if (s != session)
__wt_free(session, s->hazard);
/* Destroy the handle. */
WT_TRET(__wt_connection_destroy(conn));
return (ret);
}
/*
* __wt_connection_workers --
* Start the worker threads.
*/
int
__wt_connection_workers(WT_SESSION_IMPL *session, const char *cfg[])
{
WT_CONNECTION_IMPL *conn;
WT_SESSION_IMPL *evict_session;
conn = S2C(session);
F_SET(conn, WT_CONN_EVICTION_RUN | WT_CONN_SERVER_RUN);
/*
* Start the eviction thread.
*
* It needs a session handle because it is reading/writing pages.
* Allocate a session here so the eviction thread never needs
* to acquire the connection spinlock, which can lead to deadlock.
*/
WT_RET(__wt_open_session(conn, 1, NULL, NULL, &evict_session));
evict_session->name = "eviction-server";
WT_RET(__wt_thread_create(session,
&conn->cache_evict_tid, __wt_cache_evict_server, evict_session));
conn->cache_evict_tid_set = 1;
/*
* Start the optional statistics thread. Start statistics first so that
* other optional threads can know if statistics are enabled or not.
*/
WT_RET(__wt_statlog_create(conn, cfg));
/* Start the optional logging/archive thread. */
WT_RET(__wt_logmgr_create(conn, cfg));
/* Start the optional checkpoint thread. */
WT_RET(__wt_checkpoint_create(conn, cfg));
return (0);
}
|
