condition: introduce reference counting
[lttng-tools.git] / src / common / condition.c
index 0b184422a69bf0b3f3b36f877d0522b1ce8d8ee7..427c49e093ec3c4621161d32f94eefba730e7bf7 100644 (file)
@@ -1,22 +1,14 @@
 /*
- * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
  *
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License, version 2.1 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
- * This library 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 Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <lttng/condition/condition-internal.h>
 #include <lttng/condition/buffer-usage-internal.h>
+#include <lttng/condition/session-consumed-size-internal.h>
+#include <lttng/condition/session-rotation-internal.h>
 #include <common/macros.h>
 #include <common/error.h>
 #include <common/dynamic-buffer.h>
@@ -31,15 +23,36 @@ enum lttng_condition_type lttng_condition_get_type(
 }
 
 void lttng_condition_destroy(struct lttng_condition *condition)
+{
+       lttng_condition_put(condition);
+}
+
+static void condition_destroy_ref(struct urcu_ref *ref)
+{
+       struct lttng_condition *condition =
+               container_of(ref, struct lttng_condition, ref);
+
+       condition->destroy(condition);
+}
+
+LTTNG_HIDDEN
+void lttng_condition_get(struct lttng_condition *condition)
+{
+       urcu_ref_get(&condition->ref);
+}
+
+LTTNG_HIDDEN
+void lttng_condition_put(struct lttng_condition *condition)
 {
        if (!condition) {
                return;
        }
 
        assert(condition->destroy);
-       condition->destroy(condition);
+       urcu_ref_put(&condition->ref, condition_destroy_ref);
 }
 
+
 LTTNG_HIDDEN
 bool lttng_condition_validate(const struct lttng_condition *condition)
 {
@@ -62,11 +75,11 @@ end:
 }
 
 LTTNG_HIDDEN
-ssize_t lttng_condition_serialize(const struct lttng_condition *condition,
-               char *buf)
+int lttng_condition_serialize(const struct lttng_condition *condition,
+               struct lttng_payload *payload)
 {
-       ssize_t ret, condition_size;
-       struct lttng_condition_comm condition_comm;
+       int ret;
+       struct lttng_condition_comm condition_comm = {};
 
        if (!condition) {
                ret = -1;
@@ -74,18 +87,17 @@ ssize_t lttng_condition_serialize(const struct lttng_condition *condition,
        }
 
        condition_comm.condition_type = (int8_t) condition->type;
-       ret = sizeof(struct lttng_condition_comm);
-       if (buf) {
-               memcpy(buf, &condition_comm, ret);
-               buf += ret;
+
+       ret = lttng_dynamic_buffer_append(&payload->buffer, &condition_comm,
+                       sizeof(condition_comm));
+       if (ret) {
+               goto end;
        }
 
-       condition_size = condition->serialize(condition, buf);
-       if (condition_size < 0) {
-               ret = condition_size;
+       ret = condition->serialize(condition, payload);
+       if (ret) {
                goto end;
        }
-       ret += condition_size;
 end:
        return ret;
 }
@@ -104,35 +116,49 @@ bool lttng_condition_is_equal(const struct lttng_condition *a,
                goto end;
        }
 
+       if (a == b) {
+               is_equal = true;
+               goto end;
+       }
+
        is_equal = a->equal ? a->equal(a, b) : true;
 end:
        return is_equal;
 }
 
 LTTNG_HIDDEN
-ssize_t lttng_condition_create_from_buffer(
-               const struct lttng_buffer_view *buffer,
+ssize_t lttng_condition_create_from_payload(
+               struct lttng_payload_view *view,
                struct lttng_condition **condition)
 {
        ssize_t ret, condition_size = 0;
        const struct lttng_condition_comm *condition_comm;
-       condition_create_from_buffer_cb create_from_buffer = NULL;
+       condition_create_from_payload_cb create_from_payload = NULL;
 
-       if (!buffer || !condition) {
+       if (!view || !condition) {
                ret = -1;
                goto end;
        }
 
        DBG("Deserializing condition from buffer");
-       condition_comm = (const struct lttng_condition_comm *) buffer->data;
+       condition_comm = (typeof(condition_comm)) view->buffer.data;
        condition_size += sizeof(*condition_comm);
 
        switch ((enum lttng_condition_type) condition_comm->condition_type) {
        case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
-               create_from_buffer = lttng_condition_buffer_usage_low_create_from_buffer;
+               create_from_payload = lttng_condition_buffer_usage_low_create_from_payload;
                break;
        case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
-               create_from_buffer = lttng_condition_buffer_usage_high_create_from_buffer;
+               create_from_payload = lttng_condition_buffer_usage_high_create_from_payload;
+               break;
+       case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
+               create_from_payload = lttng_condition_session_consumed_size_create_from_payload;
+               break;
+       case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING:
+               create_from_payload = lttng_condition_session_rotation_ongoing_create_from_payload;
+               break;
+       case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED:
+               create_from_payload = lttng_condition_session_rotation_completed_create_from_payload;
                break;
        default:
                ERR("Attempted to create condition of unknown type (%i)",
@@ -141,12 +167,12 @@ ssize_t lttng_condition_create_from_buffer(
                goto end;
        }
 
-       if (create_from_buffer) {
-               const struct lttng_buffer_view view =
-                               lttng_buffer_view_from_view(buffer,
+       if (create_from_payload) {
+               struct lttng_payload_view condition_view =
+                               lttng_payload_view_from_view(view,
                                        sizeof(*condition_comm), -1);
 
-               ret = create_from_buffer(&view, condition);
+               ret = create_from_payload(&condition_view, condition);
                if (ret < 0) {
                        goto end;
                }
@@ -166,4 +192,5 @@ void lttng_condition_init(struct lttng_condition *condition,
                enum lttng_condition_type type)
 {
        condition->type = type;
+       urcu_ref_init(&condition->ref);
 }
This page took 0.025489 seconds and 4 git commands to generate.