/*
* __wt_rwlock_destroy --
* Destroy a read/write lock.
*/
void
__wt_rwlock_destroy(WT_SESSION_IMPL *session, WT_RWLOCK *l)
{
l->u.v = 0;
__wt_cond_destroy(session, &l->cond_readers);
__wt_cond_destroy(session, &l->cond_writers);
}
/*
* __wt_sweep_destroy --
* Destroy the handle-sweep thread.
*/
int
__wt_sweep_destroy(WT_CONNECTION_IMPL *conn)
{
WT_DECL_RET;
WT_SESSION *wt_session;
WT_SESSION_IMPL *session;
session = conn->default_session;
F_CLR(conn, WT_CONN_SERVER_SWEEP);
if (conn->sweep_tid_set) {
WT_TRET(__wt_cond_signal(session, conn->sweep_cond));
WT_TRET(__wt_thread_join(session, conn->sweep_tid));
conn->sweep_tid_set = 0;
}
WT_TRET(__wt_cond_destroy(session, &conn->sweep_cond));
if (conn->sweep_session != NULL) {
wt_session = &conn->sweep_session->iface;
WT_TRET(wt_session->close(wt_session, NULL));
conn->sweep_session = NULL;
}
return (ret);
}
/*
* __wt_checkpoint_server_destroy --
* Destroy the checkpoint server thread.
*/
int
__wt_checkpoint_server_destroy(WT_SESSION_IMPL *session)
{
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
WT_SESSION *wt_session;
conn = S2C(session);
F_CLR(conn, WT_CONN_SERVER_CHECKPOINT);
if (conn->ckpt_tid_set) {
__wt_cond_signal(session, conn->ckpt_cond);
WT_TRET(__wt_thread_join(session, conn->ckpt_tid));
conn->ckpt_tid_set = false;
}
WT_TRET(__wt_cond_destroy(session, &conn->ckpt_cond));
/* Close the server thread's session. */
if (conn->ckpt_session != NULL) {
wt_session = &conn->ckpt_session->iface;
WT_TRET(wt_session->close(wt_session, NULL));
}
/*
* Ensure checkpoint settings are cleared - so that reconfigure doesn't
* get confused.
*/
conn->ckpt_session = NULL;
conn->ckpt_tid_set = false;
conn->ckpt_cond = NULL;
conn->ckpt_usecs = 0;
return (ret);
}
/*
* __wt_thread_group_destroy --
* Shut down a thread group. Our caller must hold the lock.
*/
int
__wt_thread_group_destroy(WT_SESSION_IMPL *session, WT_THREAD_GROUP *group)
{
WT_DECL_RET;
__wt_verbose(session, WT_VERB_THREAD_GROUP,
"Destroying thread group: %p", (void *)group);
WT_ASSERT(session, __wt_rwlock_islocked(session, group->lock));
/* Shut down all threads and free associated resources. */
WT_TRET(__thread_group_shrink(session, group, 0));
__wt_free(session, group->threads);
WT_TRET(__wt_cond_destroy(session, &group->wait_cond));
__wt_rwlock_destroy(session, &group->lock);
/*
* Clear out any settings from the group, some structures are reused
* for different thread groups - in particular the eviction thread
* group for recovery and then normal runtime.
*/
memset(group, 0, sizeof(*group));
return (ret);
}
/*
* __wt_checkpoint_destroy --
* Destroy the checkpoint server thread.
*/
int
__wt_checkpoint_destroy(WT_CONNECTION_IMPL *conn)
{
WT_DECL_RET;
WT_SESSION *wt_session;
WT_SESSION_IMPL *session;
session = conn->default_session;
if (conn->ckpt_tid_set) {
WT_TRET(__wt_cond_signal(session, conn->ckpt_cond));
WT_TRET(__wt_thread_join(session, conn->ckpt_tid));
conn->ckpt_tid_set = 0;
}
WT_TRET(__wt_cond_destroy(session, &conn->ckpt_cond));
__wt_free(session, conn->ckpt_config);
/* Close the server thread's session. */
if (conn->ckpt_session != NULL) {
wt_session = &conn->ckpt_session->iface;
WT_TRET(wt_session->close(wt_session, NULL));
}
return (ret);
}
/*销毁一个connection evict cache对象*/
int __wt_cache_destroy(WT_SESSION_IMPL *session)
{
WT_CACHE *cache;
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
conn = S2C(session);
cache = conn->cache;
if (cache == NULL)
return 0;
WT_TRET(__wt_cond_destroy(session, &cache->evict_cond));
WT_TRET(__wt_cond_destroy(session, &cache->evict_waiter_cond));
__wt_spin_destroy(session, &cache->evict_lock);
__wt_spin_destroy(session, &cache->evict_walk_lock);
__wt_free(session, cache->evict);
__wt_free(session, conn->cache);
return ret;
}
/*
* __wt_cache_destroy --
* Discard the underlying cache.
*/
int
__wt_cache_destroy(WT_SESSION_IMPL *session)
{
WT_CACHE *cache;
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
conn = S2C(session);
cache = conn->cache;
if (cache == NULL)
return (0);
/* The cache should be empty at this point. Complain if not. */
if (cache->pages_inmem != cache->pages_evict)
__wt_errx(session,
"cache server: exiting with %" PRIu64 " pages in "
"memory and %" PRIu64 " pages evicted",
cache->pages_inmem, cache->pages_evict);
if (cache->bytes_inmem != 0)
__wt_errx(session,
"cache server: exiting with %" PRIu64 " bytes in memory",
cache->bytes_inmem);
if (cache->bytes_dirty != 0 || cache->pages_dirty != 0)
__wt_errx(session,
"cache server: exiting with %" PRIu64
" bytes dirty and %" PRIu64 " pages dirty",
cache->bytes_dirty, cache->pages_dirty);
WT_TRET(__wt_cond_destroy(session, &cache->evict_cond));
WT_TRET(__wt_cond_destroy(session, &cache->evict_waiter_cond));
__wt_spin_destroy(session, &cache->evict_lock);
__wt_spin_destroy(session, &cache->evict_walk_lock);
__wt_free(session, cache->evict);
__wt_free(session, conn->cache);
return (ret);
}
/*
* __lsm_tree_discard --
* Free an LSM tree structure.
*/
static int
__lsm_tree_discard(WT_SESSION_IMPL *session, WT_LSM_TREE *lsm_tree)
{
WT_DECL_RET;
WT_LSM_CHUNK *chunk;
u_int i;
/* We may be destroying an lsm_tree before it was added. */
if (F_ISSET(lsm_tree, WT_LSM_TREE_OPEN))
TAILQ_REMOVE(&S2C(session)->lsmqh, lsm_tree, q);
__wt_free(session, lsm_tree->name);
__wt_free(session, lsm_tree->config);
__wt_free(session, lsm_tree->key_format);
__wt_free(session, lsm_tree->value_format);
__wt_free(session, lsm_tree->collator_name);
__wt_free(session, lsm_tree->bloom_config);
__wt_free(session, lsm_tree->file_config);
WT_TRET(__wt_rwlock_destroy(session, &lsm_tree->rwlock));
WT_TRET(__wt_cond_destroy(session, &lsm_tree->work_cond));
for (i = 0; i < lsm_tree->nchunks; i++) {
if ((chunk = lsm_tree->chunk[i]) == NULL)
continue;
__wt_free(session, chunk->bloom_uri);
__wt_free(session, chunk->uri);
__wt_free(session, chunk);
}
__wt_free(session, lsm_tree->chunk);
for (i = 0; i < lsm_tree->nold_chunks; i++) {
chunk = lsm_tree->old_chunks[i];
WT_ASSERT(session, chunk != NULL);
__wt_free(session, chunk->bloom_uri);
__wt_free(session, chunk->uri);
__wt_free(session, chunk);
}
__wt_free(session, lsm_tree->old_chunks);
__wt_free(session, lsm_tree);
return (ret);
}
/*
* __wt_thread_group_create --
* Create a new thread group, assumes incoming group structure is
* zero initialized.
*/
int
__wt_thread_group_create(
WT_SESSION_IMPL *session, WT_THREAD_GROUP *group, const char *name,
uint32_t min, uint32_t max, uint32_t flags,
int (*run_func)(WT_SESSION_IMPL *session, WT_THREAD *context))
{
WT_DECL_RET;
bool cond_alloced;
/* Check that the structure is initialized as expected */
WT_ASSERT(session, group->alloc == 0);
cond_alloced = false;
__wt_verbose(session, WT_VERB_THREAD_GROUP,
"Creating thread group: %p", (void *)group);
WT_RET(__wt_rwlock_alloc(session, &group->lock, "Thread group"));
WT_ERR(__wt_cond_alloc(
session, "Thread group cond", false, &group->wait_cond));
cond_alloced = true;
__wt_writelock(session, group->lock);
group->run_func = run_func;
group->name = name;
WT_TRET(__thread_group_resize(session, group, min, max, flags));
__wt_writeunlock(session, group->lock);
/* Cleanup on error to avoid leaking resources */
err: if (ret != 0) {
if (cond_alloced)
WT_TRET(__wt_cond_destroy(session, &group->wait_cond));
__wt_rwlock_destroy(session, &group->lock);
}
return (ret);
}
/*
* __wt_logmgr_destroy --
* Destroy the log archiving server thread and logging subsystem.
*/
int
__wt_logmgr_destroy(WT_SESSION_IMPL *session)
{
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
WT_SESSION *wt_session;
conn = S2C(session);
if (!FLD_ISSET(conn->log_flags, WT_CONN_LOG_ENABLED)) {
/*
* We always set up the log_path so printlog can work without
* recovery. Therefore, always free it, even if logging isn't
* on.
*/
__wt_free(session, conn->log_path);
return (0);
}
if (conn->log_tid_set) {
WT_TRET(__wt_cond_signal(session, conn->log_cond));
WT_TRET(__wt_thread_join(session, conn->log_tid));
conn->log_tid_set = 0;
}
if (conn->log_file_tid_set) {
WT_TRET(__wt_cond_signal(session, conn->log_file_cond));
WT_TRET(__wt_thread_join(session, conn->log_file_tid));
conn->log_file_tid_set = 0;
}
if (conn->log_file_session != NULL) {
wt_session = &conn->log_file_session->iface;
WT_TRET(wt_session->close(wt_session, NULL));
conn->log_file_session = NULL;
}
if (conn->log_wrlsn_tid_set) {
WT_TRET(__wt_cond_signal(session, conn->log_wrlsn_cond));
WT_TRET(__wt_thread_join(session, conn->log_wrlsn_tid));
conn->log_wrlsn_tid_set = 0;
}
if (conn->log_wrlsn_session != NULL) {
wt_session = &conn->log_wrlsn_session->iface;
WT_TRET(wt_session->close(wt_session, NULL));
conn->log_wrlsn_session = NULL;
}
WT_TRET(__wt_log_slot_destroy(session));
WT_TRET(__wt_log_close(session));
/* Close the server thread's session. */
if (conn->log_session != NULL) {
wt_session = &conn->log_session->iface;
WT_TRET(wt_session->close(wt_session, NULL));
conn->log_session = NULL;
}
/* Destroy the condition variables now that all threads are stopped */
WT_TRET(__wt_cond_destroy(session, &conn->log_cond));
WT_TRET(__wt_cond_destroy(session, &conn->log_file_cond));
WT_TRET(__wt_cond_destroy(session, &conn->log_wrlsn_cond));
WT_TRET(__wt_cond_destroy(session, &conn->log->log_sync_cond));
WT_TRET(__wt_cond_destroy(session, &conn->log->log_write_cond));
WT_TRET(__wt_rwlock_destroy(session, &conn->log->log_archive_lock));
__wt_spin_destroy(session, &conn->log->log_lock);
__wt_spin_destroy(session, &conn->log->log_slot_lock);
__wt_spin_destroy(session, &conn->log->log_sync_lock);
__wt_spin_destroy(session, &conn->log->log_writelsn_lock);
__wt_free(session, conn->log_path);
__wt_free(session, conn->log);
return (ret);
}
/*
* __session_close --
* WT_SESSION->close method.
*/
static int
__session_close(WT_SESSION *wt_session, const char *config)
{
WT_CONNECTION_IMPL *conn;
WT_CURSOR *cursor;
WT_DECL_RET;
WT_SESSION_IMPL *session;
int tret;
conn = (WT_CONNECTION_IMPL *)wt_session->connection;
session = (WT_SESSION_IMPL *)wt_session;
SESSION_API_CALL(session, close, config, cfg);
WT_UNUSED(cfg);
/* Rollback any active transaction. */
if (F_ISSET(&session->txn, TXN_RUNNING))
WT_TRET(__session_rollback_transaction(wt_session, NULL));
/* Close all open cursors. */
while ((cursor = TAILQ_FIRST(&session->cursors)) != NULL)
WT_TRET(cursor->close(cursor));
WT_ASSERT(session, session->ncursors == 0);
/*
* Acquire the schema lock: we may be closing btree handles.
*
* Note that in some special cases, the schema may already be locked
* (e.g., if this session is an LSM tree worker and the tree is being
* dropped).
*/
WT_WITH_SCHEMA_LOCK_OPT(session, tret = __session_close_cache(session));
WT_TRET(tret);
/* Discard metadata tracking. */
__wt_meta_track_discard(session);
/* Discard scratch buffers. */
__wt_scr_discard(session);
/* Free transaction information. */
__wt_txn_destroy(session);
/* Confirm we're not holding any hazard references. */
__wt_hazard_close(session);
/* Free the reconciliation information. */
__wt_rec_destroy(session, &session->reconcile);
/* Free the eviction exclusive-lock information. */
__wt_free(session, session->excl);
/* Destroy the thread's mutex. */
if (session->cond != NULL)
(void)__wt_cond_destroy(session, session->cond);
/* The API lock protects opening and closing of sessions. */
__wt_spin_lock(session, &conn->api_lock);
/*
* Sessions are re-used, clear the structure: this code sets the active
* field to 0, which will exclude the hazard array from review by the
* eviction thread. Note: there's no serialization support around the
* review of the hazard array, which means threads checking for hazard
* references first check the active field (which may be 0) and then use
* the hazard pointer (which cannot be NULL). For this reason, clear
* the session structure carefully.
*
* We don't need to publish here, because regardless of the active field
* being non-zero, the hazard reference is always valid.
*/
WT_SESSION_CLEAR(session);
session = conn->default_session;
/*
* Decrement the count of active sessions if that's possible: a session
* being closed may or may not be at the end of the array, step toward
* the beginning of the array until we reach an active session.
*/
while (conn->sessions[conn->session_cnt - 1].active == 0)
if (--conn->session_cnt == 0)
break;
__wt_spin_unlock(session, &conn->api_lock);
err: API_END_NOTFOUND_MAP(session, ret);
}
/*
* __session_close --
* WT_SESSION->close method.
*/
static int
__session_close(WT_SESSION *wt_session, const char *config)
{
WT_BTREE_SESSION *btree_session;
WT_CONNECTION_IMPL *conn;
WT_CURSOR *cursor;
WT_SESSION_IMPL *session, **tp;
int ret;
conn = (WT_CONNECTION_IMPL *)wt_session->connection;
session = (WT_SESSION_IMPL *)wt_session;
SESSION_API_CALL(session, close, config, cfg);
WT_UNUSED(cfg);
while ((cursor = TAILQ_FIRST(&session->cursors)) != NULL)
WT_TRET(cursor->close(cursor));
while ((btree_session = TAILQ_FIRST(&session->btrees)) != NULL)
WT_TRET(__wt_session_remove_btree(session, btree_session, 0));
WT_TRET(__wt_schema_close_tables(session));
__wt_spin_lock(session, &conn->spinlock);
/* Discard scratch buffers. */
__wt_scr_discard(session);
/* Confirm we're not holding any hazard references. */
__wt_hazard_empty(session);
/* Free the reconciliation information. */
__wt_rec_destroy(session);
/* Free the eviction exclusive-lock information. */
__wt_free(session, session->excl);
/* Destroy the thread's mutex. */
if (session->cond != NULL)
(void)__wt_cond_destroy(session, session->cond);
/*
* Replace the session reference we're closing with the last entry in
* the table, then clear the last entry. As far as the walk of the
* server threads is concerned, it's OK if the session appears twice,
* or if it doesn't appear at all, so these lines can race all they
* want.
*/
for (tp = conn->sessions; *tp != session; ++tp)
;
--conn->session_cnt;
*tp = conn->sessions[conn->session_cnt];
conn->sessions[conn->session_cnt] = NULL;
/*
* Publish, making the session array entry available for re-use. There
* must be a barrier here to ensure the cleanup above completes before
* the entry is re-used.
*/
WT_PUBLISH(session->iface.connection, NULL);
session = &conn->default_session;
__wt_spin_unlock(session, &conn->spinlock);
err:
API_END_NOTFOUND_MAP(session, ret);
}