src/lib/graph/graph.h

   1 #ifndef BABELTRACE_GRAPH_GRAPH_INTERNAL_H
   2 #define BABELTRACE_GRAPH_GRAPH_INTERNAL_H
   3
   4 /*
   5  * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
   6  * Copyright 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  */
  26
  27 #include <babeltrace2/graph/graph.h>
  28 #include <babeltrace2/graph/message-const.h>
  29 #include "common/macros.h"
  30 #include "lib/object.h"
  31 #include "lib/object-pool.h"
  32 #include "common/assert.h"
  33 #include <stdlib.h>
  34 #include <glib.h>
  35
  36 #include "component.h"
  37 #include "component-sink.h"
  38 #include "connection.h"
  39
  40 struct bt_component;
  41 struct bt_port;
  42
  43 enum bt_graph_configuration_state {
  44         BT_GRAPH_CONFIGURATION_STATE_CONFIGURING,
  45         BT_GRAPH_CONFIGURATION_STATE_PARTIALLY_CONFIGURED,
  46         BT_GRAPH_CONFIGURATION_STATE_CONFIGURED,
  47         BT_GRAPH_CONFIGURATION_STATE_FAULTY,
  48 };
  49
  50 struct bt_graph {
  51         /**
  52          * A component graph contains components and point-to-point connection
  53          * between these components.
  54          *
  55          * In terms of ownership:
  56          * 1) The graph is the components' parent,
  57          * 2) The graph is the connnections' parent,
  58          * 3) Components share the ownership of their connections,
  59          * 4) A connection holds weak references to its two component endpoints.
  60          */
  61         struct bt_object base;
  62
  63         /* Array of pointers to bt_connection. */
  64         GPtrArray *connections;
  65         /* Array of pointers to bt_component. */
  66         GPtrArray *components;
  67         /* Queue of pointers (weak references) to sink bt_components. */
  68         GQueue *sinks_to_consume;
  69
  70         bool canceled;
  71         bool in_remove_listener;
  72         bool has_sink;
  73
  74         /*
  75          * If this is false, then the public API's consuming
  76          * functions (bt_graph_consume() and bt_graph_run()) return
  77          * BT_GRAPH_STATUS_CANNOT_CONSUME. The internal "no check"
  78          * functions always work.
  79          *
  80          * In bt_port_output_message_iterator_create(), on success,
  81          * this flag is cleared so that the iterator remains the only
  82          * consumer for the graph's lifetime.
  83          */
  84         bool can_consume;
  85
  86         enum bt_graph_configuration_state config_state;
  87
  88         struct {
  89                 GArray *source_output_port_added;
  90                 GArray *filter_output_port_added;
  91                 GArray *filter_input_port_added;
  92                 GArray *sink_input_port_added;
  93                 GArray *source_filter_ports_connected;
  94                 GArray *source_sink_ports_connected;
  95                 GArray *filter_filter_ports_connected;
  96                 GArray *filter_sink_ports_connected;
  97         } listeners;
  98
  99         /* Pool of `struct bt_message_event *` */
 100         struct bt_object_pool event_msg_pool;
 101
 102         /* Pool of `struct bt_message_packet_beginning *` */
 103         struct bt_object_pool packet_begin_msg_pool;
 104
 105         /* Pool of `struct bt_message_packet_end *` */
 106         struct bt_object_pool packet_end_msg_pool;
 107
 108         /*
 109          * Array of `struct bt_message *` (weak).
 110          *
 111          * This is an array of all the messages ever created from
 112          * this graph. Some of them can be in one of the pools above,
 113          * some of them can be at large. Because each message has a
 114          * weak pointer to the graph containing its pool, we need to
 115          * notify each message that the graph is gone on graph
 116          * destruction.
 117          *
 118          * TODO: When we support a maximum size for object pools,
 119          * add a way for a message to remove itself from this
 120          * array (on destruction).
 121          */
 122         GPtrArray *messages;
 123 };
 124
 125 static inline
 126 void _bt_graph_set_can_consume(struct bt_graph *graph, bool can_consume)
 127 {
 128         BT_ASSERT(graph);
 129         graph->can_consume = can_consume;
 130 }
 131
 132 #ifdef BT_DEV_MODE
 133 # define bt_graph_set_can_consume       _bt_graph_set_can_consume
 134 #else
 135 # define bt_graph_set_can_consume(_graph, _can_consume)
 136 #endif
 137
 138 BT_HIDDEN
 139 enum bt_graph_status bt_graph_consume_sink_no_check(struct bt_graph *graph,
 140                 struct bt_component_sink *sink);
 141
 142 BT_HIDDEN
 143 enum bt_graph_listener_status bt_graph_notify_port_added(struct bt_graph *graph,
 144                 struct bt_port *port);
 145
 146 BT_HIDDEN
 147 enum bt_graph_listener_status bt_graph_notify_ports_connected(
 148                 struct bt_graph *graph, struct bt_port *upstream_port,
 149                 struct bt_port *downstream_port);
 150
 151 BT_HIDDEN
 152 void bt_graph_remove_connection(struct bt_graph *graph,
 153                 struct bt_connection *connection);
 154
 155 /*
 156  * This only works with a component which is not connected at this
 157  * point.
 158  *
 159  * Also the reference count of `component` should be 0 when you call
 160  * this function, which means only `graph` owns the component, so it
 161  * is safe to destroy.
 162  */
 163 BT_HIDDEN
 164 int bt_graph_remove_unconnected_component(struct bt_graph *graph,
 165                 struct bt_component *component);
 166
 167 BT_HIDDEN
 168 void bt_graph_add_message(struct bt_graph *graph,
 169                 struct bt_message *msg);
 170
 171 static inline
 172 const char *bt_graph_status_string(enum bt_graph_status status)
 173 {
 174         switch (status) {
 175         case BT_GRAPH_STATUS_CANCELED:
 176                 return "BT_GRAPH_STATUS_CANCELED";
 177         case BT_GRAPH_STATUS_AGAIN:
 178                 return "BT_GRAPH_STATUS_AGAIN";
 179         case BT_GRAPH_STATUS_END:
 180                 return "BT_GRAPH_STATUS_END";
 181         case BT_GRAPH_STATUS_OK:
 182                 return "BT_GRAPH_STATUS_OK";
 183         case BT_GRAPH_STATUS_ERROR:
 184                 return "BT_GRAPH_STATUS_ERROR";
 185         case BT_GRAPH_STATUS_COMPONENT_REFUSES_PORT_CONNECTION:
 186                 return "BT_GRAPH_STATUS_COMPONENT_REFUSES_PORT_CONNECTION";
 187         case BT_GRAPH_STATUS_NOMEM:
 188                 return "BT_GRAPH_STATUS_NOMEM";
 189         default:
 190                 return "(unknown)";
 191         }
 192 }
 193
 194 static inline
 195 const char *bt_graph_configuration_state_string(
 196                 enum bt_graph_configuration_state state)
 197 {
 198         switch (state) {
 199         case BT_GRAPH_CONFIGURATION_STATE_CONFIGURING:
 200                 return "BT_GRAPH_CONFIGURATION_STATE_CONFIGURING";
 201         case BT_GRAPH_CONFIGURATION_STATE_PARTIALLY_CONFIGURED:
 202                 return "BT_GRAPH_CONFIGURATION_STATE_PARTIALLY_CONFIGURED";
 203         case BT_GRAPH_CONFIGURATION_STATE_CONFIGURED:
 204                 return "BT_GRAPH_CONFIGURATION_STATE_CONFIGURED";
 205         default:
 206                 return "(unknown)";
 207         }
 208 }
 209
 210 static inline
 211 enum bt_graph_status bt_graph_configure(struct bt_graph *graph)
 212 {
 213         enum bt_graph_status status = BT_GRAPH_STATUS_OK;
 214         uint64_t i;
 215
 216         BT_ASSERT(graph->config_state != BT_GRAPH_CONFIGURATION_STATE_FAULTY);
 217
 218         if (G_LIKELY(graph->config_state ==
 219                         BT_GRAPH_CONFIGURATION_STATE_CONFIGURED)) {
 220                 goto end;
 221         }
 222
 223 #ifdef BT_ASSERT_PRE
 224         BT_ASSERT_PRE(graph->has_sink, "Graph has no sink component: %!+g", graph);
 225 #endif
 226
 227         graph->config_state = BT_GRAPH_CONFIGURATION_STATE_PARTIALLY_CONFIGURED;
 228
 229         for (i = 0; i < graph->components->len; i++) {
 230                 struct bt_component *comp = graph->components->pdata[i];
 231                 struct bt_component_sink *comp_sink = (void *) comp;
 232                 struct bt_component_class_sink *comp_cls_sink =
 233                         (void *) comp->class;
 234
 235                 if (comp->class->type != BT_COMPONENT_CLASS_TYPE_SINK) {
 236                         continue;
 237                 }
 238
 239                 if (comp_sink->graph_is_configured_method_called) {
 240                         continue;
 241                 }
 242
 243                 if (comp_cls_sink->methods.graph_is_configured) {
 244                         enum bt_self_component_status comp_status;
 245
 246 #ifdef BT_LIB_LOGD
 247                         BT_LIB_LOGD("Calling user's \"graph is configured\" method: "
 248                                 "%![graph-]+g, %![comp-]+c",
 249                                 graph, comp);
 250 #endif
 251
 252                         comp_status = comp_cls_sink->methods.graph_is_configured(
 253                                 (void *) comp_sink);
 254
 255 #ifdef BT_LIB_LOGD
 256                         BT_LIB_LOGD("User method returned: status=%s",
 257                                 bt_self_component_status_string(comp_status));
 258 #endif
 259
 260 #ifdef BT_ASSERT_PRE
 261                         BT_ASSERT_PRE(comp_status == BT_SELF_COMPONENT_STATUS_OK ||
 262                                 comp_status == BT_SELF_COMPONENT_STATUS_ERROR ||
 263                                 comp_status == BT_SELF_COMPONENT_STATUS_NOMEM,
 264                                 "Unexpected returned status: status=%s",
 265                                 bt_self_component_status_string(comp_status));
 266 #endif
 267
 268                         if (comp_status != BT_SELF_COMPONENT_STATUS_OK) {
 269                                 status = BT_GRAPH_STATUS_ERROR;
 270 #ifdef BT_LIB_LOGW
 271                                 BT_LIB_LOGW("User's \"graph is configured\" method failed: "
 272                                         "%![comp-]+c, status=%s",
 273                                         comp,
 274                                         bt_self_component_status_string(
 275                                                 comp_status));
 276 #endif
 277
 278                                 goto end;
 279                         }
 280                 }
 281
 282                 comp_sink->graph_is_configured_method_called = true;
 283         }
 284
 285         graph->config_state = BT_GRAPH_CONFIGURATION_STATE_CONFIGURED;
 286
 287 end:
 288         return status;
 289 }
 290
 291 static inline
 292 void bt_graph_make_faulty(struct bt_graph *graph)
 293 {
 294         graph->config_state = BT_GRAPH_CONFIGURATION_STATE_FAULTY;
 295 #ifdef BT_LIB_LOGD
 296         BT_LIB_LOGD("Set graph's state to faulty: %![graph-]+g", graph);
 297 #endif
 298 }
 299
 300 #endif /* BABELTRACE_GRAPH_GRAPH_INTERNAL_H */