X-Git-Url: https://git.liburcu.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fjul.c;fp=src%2Fbin%2Flttng-sessiond%2Fjul.c;h=a38738c3b77537bfb711dbc160af69f892d02c1a;hp=0000000000000000000000000000000000000000;hb=0475c50c4d3d2cea973fe4d1f17875d231dea96c;hpb=b9dfb1671626365019a72318fb131eb321244245

diff --git a/src/bin/lttng-sessiond/jul.c b/src/bin/lttng-sessiond/jul.c
new file mode 100644
index 000000000..a38738c3b
--- /dev/null
+++ b/src/bin/lttng-sessiond/jul.c
@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define _GNU_SOURCE
+#include <assert.h>
+
+#include <common/common.h>
+
+#include "jul.h"
+#include "utils.h"
+
+/*
+ * URCU intermediate call to complete destroy a JUL event.
+ */
+static void destroy_event_jul_rcu(struct rcu_head *head)
+{
+	struct lttng_ht_node_str *node =
+		caa_container_of(head, struct lttng_ht_node_str, head);
+	struct jul_event *event =
+		caa_container_of(node, struct jul_event, node);
+
+	free(event);
+}
+
+/*
+ * Initialize an already allocated JUL domain object.
+ *
+ * Return 0 on success or else a negative errno value.
+ */
+int jul_init_domain(struct jul_domain *dom)
+{
+	int ret;
+
+	assert(dom);
+
+	dom->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
+	if (!dom->events) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	return 0;
+
+error:
+	return ret;
+}
+
+/*
+ * Create a newly allocated JUL event data structure. If name is valid, it's
+ * copied into the created event.
+ *
+ * Return a new object else NULL on error.
+ */
+struct jul_event *jul_create_event(const char *name)
+{
+	struct jul_event *event;
+
+	DBG3("JUL create new event with name %s", name);
+
+	event = zmalloc(sizeof(*event));
+	if (!event) {
+		goto error;
+	}
+
+	if (name) {
+		strncpy(event->name, name, sizeof(event->name));
+		event->name[sizeof(event->name) - 1] = '\0';
+	}
+
+error:
+	return event;
+}
+
+/*
+ * Unique add of a JUL event to a given domain.
+ */
+void jul_add_event(struct jul_event *event, struct jul_domain *dom)
+{
+	assert(event);
+	assert(dom);
+	assert(dom->events);
+
+	DBG3("JUL adding event %s to domain", event->name);
+
+	lttng_ht_add_unique_str(dom->events, &event->node);
+}
+
+/*
+ * Find a JUL event in the given domain using name.
+ *
+ * RCU read side lock MUST be acquired.
+ *
+ * Return object if found else NULL.
+ */
+struct jul_event *jul_find_by_name(const char *name, struct jul_domain *dom)
+{
+	struct lttng_ht_node_str *node;
+	struct lttng_ht_iter iter;
+
+	assert(name);
+	assert(dom);
+	assert(dom->events);
+
+	lttng_ht_lookup(dom->events, (void *)name, &iter);
+	node = lttng_ht_iter_get_node_str(&iter);
+	if (node == NULL) {
+		goto error;
+	}
+
+	DBG3("JUL found by name %s in domain.", name);
+	return caa_container_of(node, struct jul_event, node);
+
+error:
+	DBG3("JUL NOT found by name %s in domain.", name);
+	return NULL;
+}
+
+/*
+ * Delete JUL event from given domain. Events hash table MUST be initialized.
+ */
+void jul_delete_event(struct jul_event *event, struct jul_domain *dom)
+{
+	int ret;
+	struct lttng_ht_iter iter;
+
+	assert(event);
+	assert(dom);
+	assert(dom->events);
+
+	DBG3("JUL deleting event %s from domain", event->name);
+
+	iter.iter.node = &event->node.node;
+	rcu_read_lock();
+	ret = lttng_ht_del(dom->events, &iter);
+	rcu_read_unlock();
+	assert(!ret);
+}
+
+/*
+ * Free given JUl event. After this call, the pointer is not usable anymore.
+ */
+void jul_destroy_event(struct jul_event *event)
+{
+	assert(event);
+
+	free(event);
+}
+
+/*
+ * Destroy a JUL domain completely. Note that the given pointer is NOT freed
+ * thus a reference can be passed to this function.
+ */
+void jul_destroy_domain(struct jul_domain *dom)
+{
+	struct lttng_ht_node_str *node;
+	struct lttng_ht_iter iter;
+
+	assert(dom);
+
+	DBG3("JUL destroy domain");
+
+	/*
+	 * Just ignore if no events hash table exists. This is possible if for
+	 * instance a JUL domain object was allocated but not initialized.
+	 */
+	if (!dom->events) {
+		return;
+	}
+
+	rcu_read_lock();
+	cds_lfht_for_each_entry(dom->events->ht, &iter.iter, node, node) {
+		int ret;
+
+		ret = lttng_ht_del(dom->events, &iter);
+		assert(!ret);
+		call_rcu(&node->head, destroy_event_jul_rcu);
+	}
+	rcu_read_unlock();
+
+	ht_cleanup_push(dom->events);
+}