| 1 | #ifndef BABELTRACE_GRAPH_CLOCK_CLASS_PRIORITY_MAP_H |
| 2 | #define BABELTRACE_GRAPH_CLOCK_CLASS_PRIORITY_MAP_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright 2017 Philippe Proulx <pproulx@efficios.com> |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 8 | * of this software and associated documentation files (the "Software"), to deal |
| 9 | * in the Software without restriction, including without limitation the rights |
| 10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 11 | * copies of the Software, and to permit persons to whom the Software is |
| 12 | * furnished to do so, subject to the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice shall be included in |
| 15 | * all copies or substantial portions of the Software. |
| 16 | * |
| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 20 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 23 | * SOFTWARE. |
| 24 | * |
| 25 | * The Common Trace Format (CTF) Specification is available at |
| 26 | * http://www.efficios.com/ctf |
| 27 | */ |
| 28 | |
| 29 | /* For bt_get() */ |
| 30 | #include <babeltrace/ref.h> |
| 31 | |
| 32 | #include <stdint.h> |
| 33 | #include <stddef.h> |
| 34 | |
| 35 | #ifdef __cplusplus |
| 36 | extern "C" { |
| 37 | #endif |
| 38 | |
| 39 | struct bt_clock_class; |
| 40 | |
| 41 | /** |
| 42 | @defgroup graphclockclassprioritymap Clock class priority map |
| 43 | @ingroup graph |
| 44 | @brief Clock class priority map. |
| 45 | |
| 46 | @code |
| 47 | #include <babeltrace/graph/clock-class-priority-map.h> |
| 48 | @endcode |
| 49 | |
| 50 | A <strong><em>clock class priority map</em></strong> object associates |
| 51 | CTF IR clock classes to priorities. A clock class priority indicates |
| 52 | which clock class you should choose to sort notifications by time. |
| 53 | |
| 54 | You need a clock class priority map object when you create |
| 55 | an \link graphnotifevent event notification\endlink or |
| 56 | an \link graphnotifinactivity inactivity notification\endlink. |
| 57 | |
| 58 | A priority is a 64-bit unsigned integer. A lower value has a |
| 59 | \em higher priority. Multiple clock classes can have the same priority |
| 60 | within a given clock class priority map. |
| 61 | |
| 62 | The following functions can \em freeze clock class priority map objects: |
| 63 | |
| 64 | - bt_notification_event_create() freezes its clock class priority |
| 65 | map parameter. |
| 66 | - bt_notification_inactivity_create() freezes its clock class priority |
| 67 | map parameter. |
| 68 | |
| 69 | You cannot modify a frozen clock class priority map object: it is |
| 70 | considered immutable, except for \link refs reference counting\endlink. |
| 71 | |
| 72 | As with any Babeltrace object, clock class priority map objects have |
| 73 | <a href="https://en.wikipedia.org/wiki/Reference_counting">reference |
| 74 | counts</a>. See \ref refs to learn more about the reference counting |
| 75 | management of Babeltrace objects. |
| 76 | |
| 77 | @file |
| 78 | @brief Clock class priority map type and functions. |
| 79 | @sa graphclockclassprioritymap |
| 80 | |
| 81 | @addtogroup graphclockclassprioritymap |
| 82 | @{ |
| 83 | */ |
| 84 | |
| 85 | /** |
| 86 | @struct bt_clock_class_priority_map |
| 87 | @brief A clock class priority map. |
| 88 | @sa graphclockclassprioritymap |
| 89 | */ |
| 90 | struct bt_clock_class_priority_map; |
| 91 | |
| 92 | /** |
| 93 | @brief Creates an empty clock class priority map. |
| 94 | |
| 95 | @returns Created clock class priority map object, or \c NULL on error. |
| 96 | |
| 97 | @postsuccessrefcountret1 |
| 98 | */ |
| 99 | extern struct bt_clock_class_priority_map *bt_clock_class_priority_map_create(void); |
| 100 | |
| 101 | /** |
| 102 | @brief Returns the number of CTF IR clock classes contained in the |
| 103 | clock class priority map \p clock_class_priority_map. |
| 104 | |
| 105 | @param[in] clock_class_priority_map Clock class priority map of |
| 106 | which to get the number of |
| 107 | clock classes. |
| 108 | @returns Number of clock classes contained |
| 109 | in \p clock_class_priority_map, |
| 110 | or a negative value on error. |
| 111 | |
| 112 | @prenotnull{clock_class_priority_map} |
| 113 | @postrefcountsame{clock_class_priority_map} |
| 114 | */ |
| 115 | extern int64_t bt_clock_class_priority_map_get_clock_class_count( |
| 116 | struct bt_clock_class_priority_map *clock_class_priority_map); |
| 117 | |
| 118 | extern struct bt_clock_class * |
| 119 | bt_clock_class_priority_map_borrow_clock_class_by_index( |
| 120 | struct bt_clock_class_priority_map *clock_class_priority_map, |
| 121 | uint64_t index); |
| 122 | |
| 123 | /** |
| 124 | @brief Returns the CTF IR clock class at index \p index in the clock |
| 125 | class priority map \p clock_class_priority_map. |
| 126 | |
| 127 | @param[in] clock_class_priority_map Clock class priority map of which |
| 128 | to get the clock class at index |
| 129 | \p index. |
| 130 | @param[in] index Index of the clock class to find |
| 131 | in \p clock_class_priority_map. |
| 132 | @returns Clock class at index \p index in |
| 133 | \p clock_class_priority_map, |
| 134 | or \c NULL on error. |
| 135 | |
| 136 | @prenotnull{clock_class_priority_map} |
| 137 | @pre \p index is lesser than the number of clock classes contained in |
| 138 | the clock class priority map \p clock_class_priority_map (see |
| 139 | bt_clock_class_priority_map_get_clock_class_count()). |
| 140 | @postrefcountsame{clock_class_priority_map} |
| 141 | |
| 142 | @sa bt_clock_class_priority_map_get_clock_class_by_name(): Finds a clock |
| 143 | class by name in a given clock class priority map. |
| 144 | @sa bt_clock_class_priority_map_get_highest_priority_clock_class(): |
| 145 | Returns the clock class with the highest priority contained |
| 146 | in a given clock class priority map. |
| 147 | @sa bt_clock_class_priority_map_add_clock_class(): Adds a clock class |
| 148 | to a clock class priority map. |
| 149 | */ |
| 150 | static inline |
| 151 | struct bt_clock_class * |
| 152 | bt_clock_class_priority_map_get_clock_class_by_index( |
| 153 | struct bt_clock_class_priority_map *clock_class_priority_map, |
| 154 | uint64_t index) |
| 155 | { |
| 156 | return bt_get(bt_clock_class_priority_map_borrow_clock_class_by_index( |
| 157 | clock_class_priority_map, index)); |
| 158 | } |
| 159 | |
| 160 | extern struct bt_clock_class * |
| 161 | bt_clock_class_priority_map_borrow_clock_class_by_name( |
| 162 | struct bt_clock_class_priority_map *clock_class_priority_map, |
| 163 | const char *name); |
| 164 | |
| 165 | /** |
| 166 | @brief Returns the CTF IR clock class named \c name found in the clock |
| 167 | class priority map \p clock_class_priority_map. |
| 168 | |
| 169 | @param[in] clock_class_priority_map Clock class priority map of |
| 170 | which to get the clock class |
| 171 | named \p name. |
| 172 | @param[in] name Name of the clock class to find |
| 173 | in \p clock_class_priority_map. |
| 174 | @returns Clock class named \p name in |
| 175 | \p clock_class_priority_map, |
| 176 | or \c NULL on error. |
| 177 | |
| 178 | @prenotnull{clock_class_priority_map} |
| 179 | @prenotnull{name} |
| 180 | @postrefcountsame{clock_class_priority_map} |
| 181 | @postsuccessrefcountretinc |
| 182 | |
| 183 | @sa bt_clock_class_priority_map_get_clock_class_by_index(): Returns the clock |
| 184 | class contained in a given clock class priority map at |
| 185 | a given index. |
| 186 | @sa bt_clock_class_priority_map_get_highest_priority_clock_class(): |
| 187 | Returns the clock class with the highest priority contained in |
| 188 | a given clock class priority map. |
| 189 | @sa bt_clock_class_priority_map_add_clock_class(): Adds a clock class |
| 190 | to a clock class priority map. |
| 191 | */ |
| 192 | static inline |
| 193 | struct bt_clock_class *bt_clock_class_priority_map_get_clock_class_by_name( |
| 194 | struct bt_clock_class_priority_map *clock_class_priority_map, |
| 195 | const char *name) |
| 196 | { |
| 197 | return bt_get(bt_clock_class_priority_map_borrow_clock_class_by_name( |
| 198 | clock_class_priority_map, name)); |
| 199 | } |
| 200 | |
| 201 | extern struct bt_clock_class * |
| 202 | bt_clock_class_priority_map_borrow_highest_priority_clock_class( |
| 203 | struct bt_clock_class_priority_map *clock_class_priority_map); |
| 204 | |
| 205 | /** |
| 206 | @brief Returns the CTF IR clock class with the currently highest |
| 207 | priority within the clock class priority map |
| 208 | \p clock_class_priority_map. |
| 209 | |
| 210 | If multiple clock classes share the same highest priority in |
| 211 | \p clock_class_priority_map, you cannot deterministically know which one |
| 212 | this function returns. |
| 213 | |
| 214 | @param[in] clock_class_priority_map Clock class priority map of which |
| 215 | to get the clock class with the |
| 216 | highest priority. |
| 217 | @returns Clock class with the highest |
| 218 | priority within |
| 219 | \p clock_class_priority_map, or |
| 220 | \c NULL on error or if there are |
| 221 | no clock classes in |
| 222 | \p clock_class_priority_map. |
| 223 | |
| 224 | @prenotnull{clock_class_priority_map} |
| 225 | @postrefcountsame{clock_class_priority_map} |
| 226 | @postsuccessrefcountretinc |
| 227 | |
| 228 | @sa bt_clock_class_priority_map_get_clock_class_by_index(): Returns the clock |
| 229 | class contained in a given clock class priority map at |
| 230 | a given index. |
| 231 | @sa bt_clock_class_priority_map_get_clock_class_by_name(): Finds a |
| 232 | clock class by name in a given clock class priority map. |
| 233 | @sa bt_clock_class_priority_map_add_clock_class(): Adds a clock class |
| 234 | to a clock class priority map. |
| 235 | */ |
| 236 | static inline |
| 237 | struct bt_clock_class * |
| 238 | bt_clock_class_priority_map_get_highest_priority_clock_class( |
| 239 | struct bt_clock_class_priority_map *clock_class_priority_map) |
| 240 | { |
| 241 | return bt_get( |
| 242 | bt_clock_class_priority_map_borrow_highest_priority_clock_class( |
| 243 | clock_class_priority_map)); |
| 244 | } |
| 245 | |
| 246 | /** |
| 247 | @brief Returns the priority of the CTF IR clock class \p clock_class |
| 248 | contained within the clock class priority map |
| 249 | \p clock_class_priority_map. |
| 250 | |
| 251 | @param[in] clock_class_priority_map Clock class priority map |
| 252 | containing \p clock_class. |
| 253 | @param[in] clock_class Clock class of which to get the |
| 254 | priority. |
| 255 | @param[out] priority Returned priority of |
| 256 | \p clock_class within |
| 257 | \p clock_class_priority_map. |
| 258 | @returns 0 on success, or a negative |
| 259 | value on error. |
| 260 | |
| 261 | @prenotnull{clock_class_priority_map} |
| 262 | @prenotnull{clock_class} |
| 263 | @prenotnull{priority} |
| 264 | @pre \p clock_class is contained in \p clock_class_priority_map (was |
| 265 | previously added to \p clock_class_priority_map with |
| 266 | bt_clock_class_priority_map_add_clock_class()). |
| 267 | @postrefcountsame{clock_class_priority_map} |
| 268 | @postrefcountsame{clock_class} |
| 269 | |
| 270 | @sa bt_clock_class_priority_map_get_highest_priority_clock_class(): |
| 271 | Returns the clock class with the highest priority contained |
| 272 | in a given clock class priority map. |
| 273 | */ |
| 274 | extern int bt_clock_class_priority_map_get_clock_class_priority( |
| 275 | struct bt_clock_class_priority_map *clock_class_priority_map, |
| 276 | struct bt_clock_class *clock_class, uint64_t *priority); |
| 277 | |
| 278 | /** |
| 279 | @brief Adds the CTF IR clock class \p clock_class to the clock class |
| 280 | priority map \p clock_class_priority_map with the |
| 281 | priority \p priority. |
| 282 | |
| 283 | You can call this function even if \p clock_class is frozen. |
| 284 | |
| 285 | A lower priority value means a \em higher priority. Multiple clock |
| 286 | classes can have the same priority within a given clock class priority |
| 287 | map. |
| 288 | |
| 289 | @param[in] clock_class_priority_map Clock class priority map to |
| 290 | which to add \p clock_class. |
| 291 | @param[in] clock_class Clock class to add to |
| 292 | \p clock_class_priority_map. |
| 293 | @param[in] priority Priority of \p clock_class within |
| 294 | \p clock_class_priority_map, |
| 295 | where a lower value means a |
| 296 | higher priority. |
| 297 | @returns 0 on success, or a negative |
| 298 | value on error. |
| 299 | |
| 300 | @prenotnull{clock_class_priority_map} |
| 301 | @prenotnull{clock_class} |
| 302 | @prehot{clock_class_priority_map} |
| 303 | @postrefcountsame{clock_class_priority_map} |
| 304 | @postsuccessrefcountinc{clock_class} |
| 305 | |
| 306 | @sa bt_clock_class_priority_map_get_clock_class_by_index(): Returns the clock |
| 307 | class contained in a given clock class priority map |
| 308 | at a given index. |
| 309 | @sa bt_clock_class_priority_map_get_clock_class_by_name(): Finds a |
| 310 | clock class by name in a given clock class priority map. |
| 311 | */ |
| 312 | extern int bt_clock_class_priority_map_add_clock_class( |
| 313 | struct bt_clock_class_priority_map *clock_class_priority_map, |
| 314 | struct bt_clock_class *clock_class, uint64_t priority); |
| 315 | |
| 316 | /** |
| 317 | @brief Creates a copy of the clock class priority map |
| 318 | \p clock_class_priority_map. |
| 319 | |
| 320 | You can copy a frozen clock class priority map: the resulting copy is |
| 321 | <em>not frozen</em>. |
| 322 | |
| 323 | @param[in] clock_class_priority_map Clock class priority map to copy. |
| 324 | @returns Copy of \p clock_class_priority_map |
| 325 | on success, or a negative value |
| 326 | on error. |
| 327 | |
| 328 | @prenotnull{clock_class_priority_map} |
| 329 | @postrefcountsame{clock_class_priority_map} |
| 330 | @postsuccessrefcountret1 |
| 331 | @post <strong>On success</strong>, the returned clock class priority map |
| 332 | is not frozen. |
| 333 | */ |
| 334 | extern struct bt_clock_class_priority_map *bt_clock_class_priority_map_copy( |
| 335 | struct bt_clock_class_priority_map *clock_class_priority_map); |
| 336 | |
| 337 | /** @} */ |
| 338 | |
| 339 | #ifdef __cplusplus |
| 340 | } |
| 341 | #endif |
| 342 | |
| 343 | #endif /* BABELTRACE_GRAPH_CLOCK_CLASS_PRIORITY_MAP_H */ |