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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 | /* * Copyright (c) 1997-2016 Wind River Systems, Inc. * * SPDX-License-Identifier: Apache-2.0 */ #include <kernel.h> #include <debug/object_tracing_common.h> #include <init.h> #include <wait_q.h> extern struct k_timer _k_timer_list_start[]; extern struct k_timer _k_timer_list_end[]; #ifdef CONFIG_OBJECT_TRACING struct k_timer *_trace_list_k_timer; /* * Complete initialization of statically defined timers. */ static int init_timer_module(struct device *dev) { ARG_UNUSED(dev); struct k_timer *timer; for (timer = _k_timer_list_start; timer < _k_timer_list_end; timer++) { SYS_TRACING_OBJ_INIT(k_timer, timer); } return 0; } SYS_INIT(init_timer_module, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_OBJECTS); #endif /* CONFIG_OBJECT_TRACING */ /** * @brief Handle expiration of a kernel timer object. * * @param t Timeout used by the timer. * * @return N/A */ void _timer_expiration_handler(struct _timeout *t) { struct k_timer *timer = CONTAINER_OF(t, struct k_timer, timeout); struct k_thread *thread; unsigned int key; /* * if the timer is periodic, start it again; don't add _TICK_ALIGN * since we're already aligned to a tick boundary */ if (timer->period > 0) { key = irq_lock(); _add_timeout(NULL, &timer->timeout, &timer->wait_q, timer->period); irq_unlock(key); } /* update timer's status */ timer->status += 1; /* invoke timer expiry function */ if (timer->expiry_fn) { timer->expiry_fn(timer); } thread = (struct k_thread *)sys_dlist_peek_head(&timer->wait_q); if (!thread) { return; } /* * Interrupts _DO NOT_ have to be locked in this specific instance of * calling _unpend_thread() because a) this is the only place a thread * can be taken off this pend queue, and b) the only place a thread * can be put on the pend queue is at thread level, which of course * cannot interrupt the current context. */ _unpend_thread(thread); key = irq_lock(); _ready_thread(thread); irq_unlock(key); _set_thread_return_value(thread, 0); } void k_timer_init(struct k_timer *timer, void (*expiry_fn)(struct k_timer *), void (*stop_fn)(struct k_timer *)) { timer->expiry_fn = expiry_fn; timer->stop_fn = stop_fn; timer->status = 0; sys_dlist_init(&timer->wait_q); _init_timeout(&timer->timeout, _timer_expiration_handler); SYS_TRACING_OBJ_INIT(k_timer, timer); timer->user_data = NULL; } void k_timer_start(struct k_timer *timer, s32_t duration, s32_t period) { __ASSERT(duration >= 0 && period >= 0 && (duration != 0 || period != 0), "invalid parameters\n"); volatile s32_t period_in_ticks, duration_in_ticks; period_in_ticks = _ms_to_ticks(period); duration_in_ticks = _TICK_ALIGN + _ms_to_ticks(duration); unsigned int key = irq_lock(); if (timer->timeout.delta_ticks_from_prev != _INACTIVE) { _abort_timeout(&timer->timeout); } timer->period = period_in_ticks; _add_timeout(NULL, &timer->timeout, &timer->wait_q, duration_in_ticks); timer->status = 0; irq_unlock(key); } void k_timer_stop(struct k_timer *timer) { int key = irq_lock(); int inactive = (_abort_timeout(&timer->timeout) == _INACTIVE); irq_unlock(key); if (inactive) { return; } if (timer->stop_fn) { timer->stop_fn(timer); } key = irq_lock(); struct k_thread *pending_thread = _unpend_first_thread(&timer->wait_q); if (pending_thread) { _ready_thread(pending_thread); } if (_is_in_isr()) { irq_unlock(key); } else { _reschedule_threads(key); } } u32_t k_timer_status_get(struct k_timer *timer) { unsigned int key = irq_lock(); u32_t result = timer->status; timer->status = 0; irq_unlock(key); return result; } u32_t k_timer_status_sync(struct k_timer *timer) { __ASSERT(!_is_in_isr(), ""); unsigned int key = irq_lock(); u32_t result = timer->status; if (result == 0) { if (timer->timeout.delta_ticks_from_prev != _INACTIVE) { /* wait for timer to expire or stop */ _pend_current_thread(&timer->wait_q, K_FOREVER); _Swap(key); /* get updated timer status */ key = irq_lock(); result = timer->status; } else { /* timer is already stopped */ } } else { /* timer has already expired at least once */ } timer->status = 0; irq_unlock(key); return result; } s32_t _timeout_remaining_get(struct _timeout *timeout) { unsigned int key = irq_lock(); s32_t remaining_ticks; if (timeout->delta_ticks_from_prev == _INACTIVE) { remaining_ticks = 0; } else { /* * compute remaining ticks by walking the timeout list * and summing up the various tick deltas involved */ struct _timeout *t = (struct _timeout *)sys_dlist_peek_head(&_timeout_q); remaining_ticks = t->delta_ticks_from_prev; while (t != timeout) { t = (struct _timeout *)sys_dlist_peek_next(&_timeout_q, &t->node); remaining_ticks += t->delta_ticks_from_prev; } } irq_unlock(key); return __ticks_to_ms(remaining_ticks); } |