Import Percona XtraDB into the MariaDB source tree.

1 files changed, 97 insertions, 0 deletions

diff --git a/storage/xtradb/usr/usr0sess.c b/storage/xtradb/usr/usr0sess.c
new file mode 100644
index 00000000000..f45c43869ea
--- /dev/null
+++ b/storage/xtradb/usr/usr0sess.c
@@ -0,0 +1,97 @@
+/*****************************************************************************
+
+Copyright (c) 1996, 2009, Innobase Oy. 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., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+
+*****************************************************************************/
+
+/******************************************************
+Sessions
+
+Created 6/25/1996 Heikki Tuuri
+*******************************************************/
+
+#include "usr0sess.h"
+
+#ifdef UNIV_NONINL
+#include "usr0sess.ic"
+#endif
+
+#include "trx0trx.h"
+
+/*************************************************************************
+Closes a session, freeing the memory occupied by it. */
+static
+void
+sess_close(
+/*=======*/
+	sess_t*		sess);	/* in, own: session object */
+
+/*************************************************************************
+Opens a session. */
+UNIV_INTERN
+sess_t*
+sess_open(void)
+/*===========*/
+					/* out, own: session object */
+{
+	sess_t*	sess;
+
+	ut_ad(mutex_own(&kernel_mutex));
+
+	sess = mem_alloc(sizeof(sess_t));
+
+	sess->state = SESS_ACTIVE;
+
+	sess->trx = trx_create(sess);
+
+	UT_LIST_INIT(sess->graphs);
+
+	return(sess);
+}
+
+/*************************************************************************
+Closes a session, freeing the memory occupied by it. */
+static
+void
+sess_close(
+/*=======*/
+	sess_t*	sess)	/* in, own: session object */
+{
+	ut_ad(mutex_own(&kernel_mutex));
+	ut_ad(sess->trx == NULL);
+
+	mem_free(sess);
+}
+
+/*************************************************************************
+Closes a session, freeing the memory occupied by it, if it is in a state
+where it should be closed. */
+UNIV_INTERN
+ibool
+sess_try_close(
+/*===========*/
+			/* out: TRUE if closed */
+	sess_t*	sess)	/* in, own: session object */
+{
+	ut_ad(mutex_own(&kernel_mutex));
+
+	if (UT_LIST_GET_LEN(sess->graphs) == 0) {
+		sess_close(sess);
+
+		return(TRUE);
+	}
+
+	return(FALSE);
+}