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-rw-r--r--sql/sql_manager.cc163
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+/* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
+
+/*
+ * sql_manager.cc
+ * This thread manages various maintenance tasks.
+ *
+ * o Flushing the tables every flush_time seconds.
+ * o Berkeley DB: removing unneeded log files.
+ */
+
+#include "mariadb.h"
+#include "sql_priv.h"
+#include "sql_manager.h"
+#include "sql_base.h" // flush_tables
+
+static bool volatile manager_thread_in_use = 0;
+static bool abort_manager = false;
+
+pthread_t manager_thread;
+mysql_mutex_t LOCK_manager;
+mysql_cond_t COND_manager;
+
+struct handler_cb {
+ struct handler_cb *next;
+ void (*action)(void *);
+ void *data;
+};
+
+static struct handler_cb *cb_list; // protected by LOCK_manager
+
+bool mysql_manager_submit(void (*action)(void *), void *data)
+{
+ bool result= FALSE;
+ DBUG_ASSERT(manager_thread_in_use);
+ struct handler_cb **cb;
+ mysql_mutex_lock(&LOCK_manager);
+ cb= &cb_list;
+ while (*cb)
+ cb= &(*cb)->next;
+ *cb= (struct handler_cb *)my_malloc(PSI_INSTRUMENT_ME,
+ sizeof(struct handler_cb), MYF(MY_WME));
+ if (!*cb)
+ result= TRUE;
+ else
+ {
+ (*cb)->next= NULL;
+ (*cb)->action= action;
+ (*cb)->data= data;
+ }
+ mysql_cond_signal(&COND_manager);
+ mysql_mutex_unlock(&LOCK_manager);
+ return result;
+}
+
+pthread_handler_t handle_manager(void *arg __attribute__((unused)))
+{
+ int error = 0;
+ struct timespec abstime;
+ bool reset_flush_time = TRUE;
+ my_thread_init();
+ DBUG_ENTER("handle_manager");
+
+ pthread_detach_this_thread();
+ manager_thread = pthread_self();
+ mysql_mutex_lock(&LOCK_manager);
+ while (!abort_manager)
+ {
+ /* XXX: This will need to be made more general to handle different
+ * polling needs. */
+ if (flush_time)
+ {
+ if (reset_flush_time)
+ {
+ set_timespec(abstime, flush_time);
+ reset_flush_time = FALSE;
+ }
+ while ((!error || error == EINTR) && !abort_manager && !cb_list)
+ error= mysql_cond_timedwait(&COND_manager, &LOCK_manager, &abstime);
+
+ if (error == ETIMEDOUT || error == ETIME)
+ {
+ tc_purge();
+ error = 0;
+ reset_flush_time = TRUE;
+ }
+ }
+ else
+ {
+ while ((!error || error == EINTR) && !abort_manager && !cb_list)
+ error= mysql_cond_wait(&COND_manager, &LOCK_manager);
+ }
+
+ struct handler_cb *cb= cb_list;
+ cb_list= NULL;
+ mysql_mutex_unlock(&LOCK_manager);
+
+ while (cb)
+ {
+ struct handler_cb *next= cb->next;
+ cb->action(cb->data);
+ my_free(cb);
+ cb= next;
+ }
+ mysql_mutex_lock(&LOCK_manager);
+ }
+ manager_thread_in_use = 0;
+ mysql_mutex_unlock(&LOCK_manager);
+ mysql_mutex_destroy(&LOCK_manager);
+ mysql_cond_destroy(&COND_manager);
+ DBUG_LEAVE; // Can't use DBUG_RETURN after my_thread_end
+ my_thread_end();
+ return (NULL);
+}
+
+
+/* Start handle manager thread */
+void start_handle_manager()
+{
+ DBUG_ENTER("start_handle_manager");
+ abort_manager = false;
+ {
+ pthread_t hThread;
+ int err;
+ manager_thread_in_use = 1;
+ mysql_cond_init(key_COND_manager, &COND_manager,NULL);
+ mysql_mutex_init(key_LOCK_manager, &LOCK_manager, NULL);
+ if ((err= mysql_thread_create(key_thread_handle_manager, &hThread,
+ &connection_attrib, handle_manager, 0)))
+ sql_print_warning("Can't create handle_manager thread (errno: %M)", err);
+ }
+ DBUG_VOID_RETURN;
+}
+
+
+/* Initiate shutdown of handle manager thread */
+void stop_handle_manager()
+{
+ DBUG_ENTER("stop_handle_manager");
+ if (manager_thread_in_use)
+ {
+ mysql_mutex_lock(&LOCK_manager);
+ abort_manager = true;
+ DBUG_PRINT("quit", ("initiate shutdown of handle manager thread: %lu",
+ (ulong)manager_thread));
+ mysql_cond_signal(&COND_manager);
+ mysql_mutex_unlock(&LOCK_manager);
+ }
+ DBUG_VOID_RETURN;
+}
+