| 1 | /* |
| 2 | * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com> |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 5 | * of this software and associated documentation files (the "Software"), to deal |
| 6 | * in the Software without restriction, including without limitation the rights |
| 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 8 | * copies of the Software, and to permit persons to whom the Software is |
| 9 | * furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice shall be included in |
| 12 | * all copies or substantial portions of the Software. |
| 13 | * |
| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 20 | * SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #define BT_LOG_TAG "CLOCK-VALUE" |
| 24 | #include <babeltrace/lib-logging-internal.h> |
| 25 | |
| 26 | #include <babeltrace/assert-pre-internal.h> |
| 27 | #include <babeltrace/compat/uuid-internal.h> |
| 28 | #include <babeltrace/ctf-ir/clock-class-internal.h> |
| 29 | #include <babeltrace/ctf-ir/clock-value-internal.h> |
| 30 | #include <babeltrace/ref.h> |
| 31 | #include <babeltrace/compiler-internal.h> |
| 32 | #include <babeltrace/types.h> |
| 33 | #include <babeltrace/compat/string-internal.h> |
| 34 | #include <inttypes.h> |
| 35 | #include <babeltrace/object-internal.h> |
| 36 | #include <babeltrace/assert-internal.h> |
| 37 | |
| 38 | BT_HIDDEN |
| 39 | void bt_clock_value_destroy(struct bt_clock_value *clock_value) |
| 40 | { |
| 41 | BT_LIB_LOGD("Destroying clock value: %!+k", clock_value); |
| 42 | bt_put(clock_value->clock_class); |
| 43 | g_free(clock_value); |
| 44 | } |
| 45 | |
| 46 | BT_HIDDEN |
| 47 | struct bt_clock_value *bt_clock_value_new(struct bt_clock_class *clock_class) |
| 48 | { |
| 49 | struct bt_clock_value *ret = NULL; |
| 50 | |
| 51 | BT_ASSERT(clock_class); |
| 52 | BT_LIB_LOGD("Creating clock value object: %![cc-]+K=", |
| 53 | clock_class); |
| 54 | ret = g_new0(struct bt_clock_value, 1); |
| 55 | if (!ret) { |
| 56 | BT_LOGE_STR("Failed to allocate one clock value."); |
| 57 | goto end; |
| 58 | } |
| 59 | |
| 60 | bt_object_init_unique(&ret->base); |
| 61 | ret->clock_class = bt_get(clock_class); |
| 62 | bt_clock_class_freeze(clock_class); |
| 63 | BT_LIB_LOGD("Created clock value object: %!+k", ret); |
| 64 | |
| 65 | end: |
| 66 | return ret; |
| 67 | } |
| 68 | |
| 69 | BT_HIDDEN |
| 70 | struct bt_clock_value *bt_clock_value_create(struct bt_clock_class *clock_class) |
| 71 | { |
| 72 | struct bt_clock_value *clock_value = NULL; |
| 73 | |
| 74 | BT_ASSERT(clock_class); |
| 75 | clock_value = bt_object_pool_create_object(&clock_class->cv_pool); |
| 76 | if (!clock_value) { |
| 77 | BT_LIB_LOGE("Cannot allocate one clock value from clock class's clock value pool: " |
| 78 | "%![cc-]+K", clock_class); |
| 79 | goto error; |
| 80 | } |
| 81 | |
| 82 | if (likely(!clock_value->clock_class)) { |
| 83 | clock_value->clock_class = bt_get(clock_class); |
| 84 | } |
| 85 | |
| 86 | goto end; |
| 87 | |
| 88 | error: |
| 89 | if (clock_value) { |
| 90 | bt_clock_value_recycle(clock_value); |
| 91 | clock_value = NULL; |
| 92 | } |
| 93 | |
| 94 | end: |
| 95 | return clock_value; |
| 96 | } |
| 97 | |
| 98 | BT_HIDDEN |
| 99 | void bt_clock_value_recycle(struct bt_clock_value *clock_value) |
| 100 | { |
| 101 | struct bt_clock_class *clock_class; |
| 102 | |
| 103 | BT_ASSERT(clock_value); |
| 104 | BT_LIB_LOGD("Recycling clock value: %!+k", clock_value); |
| 105 | |
| 106 | /* |
| 107 | * Those are the important ordered steps: |
| 108 | * |
| 109 | * 1. Reset the clock value object, but do NOT put its clock |
| 110 | * class's reference. This clock class contains the pool to |
| 111 | * which we're about to recycle this clock value object, so |
| 112 | * we must guarantee its existence thanks to this existing |
| 113 | * reference. |
| 114 | * |
| 115 | * 2. Move the clock class reference to our `clock_class` |
| 116 | * variable so that we can set the clock value's clock class |
| 117 | * member to NULL before recycling it. We CANNOT do this |
| 118 | * after we put the clock class reference because this |
| 119 | * bt_put() could destroy the clock class, also destroying |
| 120 | * its clock value pool, thus also destroying our clock value |
| 121 | * object (this would result in an invalid write access). |
| 122 | * |
| 123 | * 3. Recycle the clock value object. |
| 124 | * |
| 125 | * 4. Put our clock class reference. |
| 126 | */ |
| 127 | bt_clock_value_reset(clock_value); |
| 128 | clock_class = clock_value->clock_class; |
| 129 | BT_ASSERT(clock_class); |
| 130 | clock_value->clock_class = NULL; |
| 131 | bt_object_pool_recycle_object(&clock_class->cv_pool, clock_value); |
| 132 | bt_put(clock_class); |
| 133 | } |
| 134 | |
| 135 | uint64_t bt_clock_value_get_value(struct bt_clock_value *clock_value) |
| 136 | { |
| 137 | BT_ASSERT_PRE_NON_NULL(clock_value, "Clock value"); |
| 138 | BT_ASSERT_PRE(clock_value->is_set, |
| 139 | "Clock value is not set: %!+k", clock_value); |
| 140 | return clock_value->value_cycles; |
| 141 | } |
| 142 | |
| 143 | int bt_clock_value_get_ns_from_origin(struct bt_clock_value *clock_value, |
| 144 | int64_t *ret_value_ns) |
| 145 | { |
| 146 | int ret = 0; |
| 147 | BT_ASSERT_PRE_NON_NULL(clock_value, "Clock value"); |
| 148 | BT_ASSERT_PRE_NON_NULL(ret_value_ns, "Value (ns) (output)"); |
| 149 | BT_ASSERT_PRE(clock_value->is_set, |
| 150 | "Clock value is not set: %!+k", clock_value); |
| 151 | |
| 152 | if (clock_value->ns_from_origin_overflows) { |
| 153 | BT_LIB_LOGD("Clock value, once converted to nanoseconds from origin, " |
| 154 | "overflows the signed 64-bit integer range: " |
| 155 | "%![cv-]+k", clock_value); |
| 156 | ret = -1; |
| 157 | goto end; |
| 158 | } |
| 159 | |
| 160 | *ret_value_ns = clock_value->ns_from_origin; |
| 161 | |
| 162 | end: |
| 163 | return ret; |
| 164 | } |
| 165 | |
| 166 | struct bt_clock_class *bt_clock_value_borrow_clock_class( |
| 167 | struct bt_clock_value *clock_value) |
| 168 | { |
| 169 | BT_ASSERT_PRE_NON_NULL(clock_value, "Clock value"); |
| 170 | return clock_value->clock_class; |
| 171 | } |