| 1 | #ifndef BABELTRACE_CTF_IR_CLOCK_H |
| 2 | #define BABELTRACE_CTF_IR_CLOCK_H |
| 3 | |
| 4 | /* |
| 5 | * BabelTrace - CTF IR: Clock |
| 6 | * |
| 7 | * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 8 | * |
| 9 | * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 10 | * |
| 11 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 12 | * of this software and associated documentation files (the "Software"), to deal |
| 13 | * in the Software without restriction, including without limitation the rights |
| 14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 15 | * copies of the Software, and to permit persons to whom the Software is |
| 16 | * furnished to do so, subject to the following conditions: |
| 17 | * |
| 18 | * The above copyright notice and this permission notice shall be included in |
| 19 | * all copies or substantial portions of the Software. |
| 20 | * |
| 21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 24 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 26 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 27 | * SOFTWARE. |
| 28 | * |
| 29 | * The Common Trace Format (CTF) Specification is available at |
| 30 | * http://www.efficios.com/ctf |
| 31 | */ |
| 32 | |
| 33 | #include <stdint.h> |
| 34 | |
| 35 | #ifdef __cplusplus |
| 36 | extern "C" { |
| 37 | #endif |
| 38 | |
| 39 | struct bt_ctf_clock; |
| 40 | |
| 41 | /* |
| 42 | * bt_ctf_clock_create: create a clock. |
| 43 | * |
| 44 | * Allocate a new clock setting its reference count to 1. |
| 45 | * |
| 46 | * @param name Name of the clock (will be copied). |
| 47 | * |
| 48 | * Returns an allocated clock on success, NULL on error. |
| 49 | */ |
| 50 | extern struct bt_ctf_clock *bt_ctf_clock_create(const char *name); |
| 51 | |
| 52 | /* |
| 53 | * bt_ctf_clock_get_name: get a clock's name. |
| 54 | * |
| 55 | * Get the clock's name. |
| 56 | * |
| 57 | * @param clock Clock instance. |
| 58 | * |
| 59 | * Returns the clock's name, NULL on error. |
| 60 | */ |
| 61 | extern const char *bt_ctf_clock_get_name(struct bt_ctf_clock *clock); |
| 62 | |
| 63 | /* |
| 64 | * bt_ctf_clock_get_description: get a clock's description. |
| 65 | * |
| 66 | * Get the clock's description. |
| 67 | * |
| 68 | * @param clock Clock instance. |
| 69 | * |
| 70 | * Returns the clock's description, NULL if unset. |
| 71 | */ |
| 72 | extern const char *bt_ctf_clock_get_description(struct bt_ctf_clock *clock); |
| 73 | |
| 74 | /* |
| 75 | * bt_ctf_clock_set_description: set a clock's description. |
| 76 | * |
| 77 | * Set the clock's description. The description appears in the clock's TSDL |
| 78 | * meta-data. |
| 79 | * |
| 80 | * @param clock Clock instance. |
| 81 | * @param desc Description of the clock. |
| 82 | * |
| 83 | * Returns 0 on success, a negative value on error. |
| 84 | */ |
| 85 | extern int bt_ctf_clock_set_description(struct bt_ctf_clock *clock, |
| 86 | const char *desc); |
| 87 | |
| 88 | /* |
| 89 | * bt_ctf_clock_get_frequency: get a clock's frequency. |
| 90 | * |
| 91 | * Get the clock's frequency (Hz). |
| 92 | * |
| 93 | * @param clock Clock instance. |
| 94 | * |
| 95 | * Returns the clock's frequency, -1ULL on error. |
| 96 | */ |
| 97 | extern uint64_t bt_ctf_clock_get_frequency(struct bt_ctf_clock *clock); |
| 98 | |
| 99 | /* |
| 100 | * bt_ctf_clock_set_frequency: set a clock's frequency. |
| 101 | * |
| 102 | * Set the clock's frequency (Hz). |
| 103 | * |
| 104 | * @param clock Clock instance. |
| 105 | * @param freq Clock's frequency in Hz, defaults to 1 000 000 000 Hz (1ns). |
| 106 | * |
| 107 | * Returns 0 on success, a negative value on error. |
| 108 | */ |
| 109 | extern int bt_ctf_clock_set_frequency(struct bt_ctf_clock *clock, |
| 110 | uint64_t freq); |
| 111 | |
| 112 | /* |
| 113 | * bt_ctf_clock_get_precision: get a clock's precision. |
| 114 | * |
| 115 | * Get the clock's precision (in clock ticks). |
| 116 | * |
| 117 | * @param clock Clock instance. |
| 118 | * |
| 119 | * Returns the clock's precision, -1ULL on error. |
| 120 | */ |
| 121 | extern uint64_t bt_ctf_clock_get_precision(struct bt_ctf_clock *clock); |
| 122 | |
| 123 | /* |
| 124 | * bt_ctf_clock_set_precision: set a clock's precision. |
| 125 | * |
| 126 | * Set the clock's precision. |
| 127 | * |
| 128 | * @param clock Clock instance. |
| 129 | * @param precision Clock's precision in clock ticks, defaults to 1. |
| 130 | * |
| 131 | * Returns 0 on success, a negative value on error. |
| 132 | */ |
| 133 | extern int bt_ctf_clock_set_precision(struct bt_ctf_clock *clock, |
| 134 | uint64_t precision); |
| 135 | |
| 136 | /* |
| 137 | * bt_ctf_clock_get_offset_s: get a clock's offset in seconds. |
| 138 | * |
| 139 | * Get the clock's offset in seconds from POSIX.1 Epoch, 1970-01-01. |
| 140 | * |
| 141 | * @param clock Clock instance. |
| 142 | * |
| 143 | * Returns the clock's offset in seconds, -1ULL on error. |
| 144 | */ |
| 145 | extern uint64_t bt_ctf_clock_get_offset_s(struct bt_ctf_clock *clock); |
| 146 | |
| 147 | /* |
| 148 | * bt_ctf_clock_set_offset_s: set a clock's offset in seconds. |
| 149 | * |
| 150 | * Set the clock's offset in seconds from POSIX.1 Epoch, 1970-01-01, |
| 151 | * defaults to 0. |
| 152 | * |
| 153 | * @param clock Clock instance. |
| 154 | * @param offset_s Clock's offset in seconds, defaults to 0. |
| 155 | * |
| 156 | * Returns 0 on success, a negative value on error. |
| 157 | */ |
| 158 | extern int bt_ctf_clock_set_offset_s(struct bt_ctf_clock *clock, |
| 159 | uint64_t offset_s); |
| 160 | |
| 161 | /* |
| 162 | * bt_ctf_clock_get_offset_s: get a clock's offset in ticks. |
| 163 | * |
| 164 | * Get the clock's offset in ticks from Epoch + offset_t. |
| 165 | * |
| 166 | * @param clock Clock instance. |
| 167 | * |
| 168 | * Returns the clock's offset in ticks from Epoch + offset_s, -1ULL on error. |
| 169 | */ |
| 170 | extern uint64_t bt_ctf_clock_get_offset(struct bt_ctf_clock *clock); |
| 171 | |
| 172 | /* |
| 173 | * bt_ctf_clock_set_offset: set a clock's offset in ticks. |
| 174 | * |
| 175 | * Set the clock's offset in ticks from Epoch + offset_s. |
| 176 | * |
| 177 | * @param clock Clock instance. |
| 178 | * @param offset Clock's offset in ticks from Epoch + offset_s, defaults to 0. |
| 179 | * |
| 180 | * Returns 0 on success, a negative value on error. |
| 181 | */ |
| 182 | extern int bt_ctf_clock_set_offset(struct bt_ctf_clock *clock, |
| 183 | uint64_t offset); |
| 184 | |
| 185 | /* |
| 186 | * bt_ctf_clock_get_is_absolute: get a clock's absolute attribute. |
| 187 | * |
| 188 | * Get the clock's absolute attribute. A clock is absolute if the clock is a |
| 189 | * global reference across the trace's other clocks. |
| 190 | * |
| 191 | * @param clock Clock instance. |
| 192 | * |
| 193 | * Returns the clock's absolute attribute, a negative value on error. |
| 194 | */ |
| 195 | extern int bt_ctf_clock_get_is_absolute(struct bt_ctf_clock *clock); |
| 196 | |
| 197 | /* |
| 198 | * bt_ctf_clock_set_is_absolute: set a clock's absolute attribute. |
| 199 | * |
| 200 | * Set the clock's absolute attribute. A clock is absolute if the clock is a |
| 201 | * global reference across the trace's other clocks. |
| 202 | * |
| 203 | * @param clock Clock instance. |
| 204 | * @param is_absolute Clock's absolute attribute, defaults to FALSE. |
| 205 | * |
| 206 | * Returns 0 on success, a negative value on error. |
| 207 | */ |
| 208 | extern int bt_ctf_clock_set_is_absolute(struct bt_ctf_clock *clock, |
| 209 | int is_absolute); |
| 210 | |
| 211 | /* |
| 212 | * bt_ctf_clock_get_time: get a clock's current time value. |
| 213 | * |
| 214 | * Get the current time in nanoseconds since the clock's origin (offset and |
| 215 | * offset_s attributes). |
| 216 | * |
| 217 | * Returns the clock's current time value, -1ULL on error. |
| 218 | */ |
| 219 | extern uint64_t bt_ctf_clock_get_time(struct bt_ctf_clock *clock); |
| 220 | |
| 221 | /* |
| 222 | * bt_ctf_clock_set_time: set a clock's current time value. |
| 223 | * |
| 224 | * Set the current time in nanoseconds since the clock's origin (offset and |
| 225 | * offset_s attributes). Defaults to 0. |
| 226 | * |
| 227 | * Returns 0 on success, a negative value on error. |
| 228 | */ |
| 229 | extern int bt_ctf_clock_set_time(struct bt_ctf_clock *clock, |
| 230 | uint64_t time); |
| 231 | |
| 232 | /* |
| 233 | * bt_ctf_clock_get and bt_ctf_clock_put: increment and decrement the |
| 234 | * refcount of the clock |
| 235 | * |
| 236 | * These functions ensure that the clock won't be destroyed when it |
| 237 | * is in use. The same number of get and put (plus one extra put to |
| 238 | * release the initial reference done at creation) has to be done to |
| 239 | * destroy a clock. |
| 240 | * |
| 241 | * When the clock refcount is decremented to 0 by a bt_ctf_clock_put, |
| 242 | * the clock is freed. |
| 243 | * |
| 244 | * @param clock Clock instance. |
| 245 | */ |
| 246 | extern void bt_ctf_clock_get(struct bt_ctf_clock *clock); |
| 247 | extern void bt_ctf_clock_put(struct bt_ctf_clock *clock); |
| 248 | |
| 249 | #ifdef __cplusplus |
| 250 | } |
| 251 | #endif |
| 252 | |
| 253 | #endif /* BABELTRACE_CTF_IR_CLOCK_H */ |