/* * Copyright (c) 1997-2016 Wind River Systems, Inc. * * SPDX-License-Identifier: Apache-2.0 */ #include #include #include #include #include #include #include extern struct k_timer _k_timer_list_start[]; extern struct k_timer _k_timer_list_end[]; static struct k_spinlock lock; #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 z_timer_expiration_handler(struct _timeout *t) { struct k_timer *timer = CONTAINER_OF(t, struct k_timer, timeout); struct k_thread *thread; /* * 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) { z_add_timeout(&timer->timeout, z_timer_expiration_handler, timer->period); } /* update timer's status */ timer->status += 1U; /* invoke timer expiry function */ if (timer->expiry_fn != NULL) { timer->expiry_fn(timer); } thread = z_waitq_head(&timer->wait_q); if (thread == NULL) { return; } /* * Interrupts _DO NOT_ have to be locked in this specific * instance of thread unpending 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. */ z_unpend_thread_no_timeout(thread); z_ready_thread(thread); z_set_thread_return_value(thread, 0); } void k_timer_init(struct k_timer *timer, k_timer_expiry_t expiry_fn, k_timer_stop_t stop_fn) { timer->expiry_fn = expiry_fn; timer->stop_fn = stop_fn; timer->status = 0U; z_waitq_init(&timer->wait_q); z_init_timeout(&timer->timeout, z_timer_expiration_handler); SYS_TRACING_OBJ_INIT(k_timer, timer); timer->user_data = NULL; z_object_init(timer); } void z_impl_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 = z_ms_to_ticks(period); duration_in_ticks = z_ms_to_ticks(duration); (void)z_abort_timeout(&timer->timeout); timer->period = period_in_ticks; timer->status = 0U; z_add_timeout(&timer->timeout, z_timer_expiration_handler, duration_in_ticks); } #ifdef CONFIG_USERSPACE Z_SYSCALL_HANDLER(k_timer_start, timer, duration_p, period_p) { s32_t duration, period; duration = (s32_t)duration_p; period = (s32_t)period_p; Z_OOPS(Z_SYSCALL_VERIFY(duration >= 0 && period >= 0 && (duration != 0 || period != 0))); Z_OOPS(Z_SYSCALL_OBJ(timer, K_OBJ_TIMER)); z_impl_k_timer_start((struct k_timer *)timer, duration, period); return 0; } #endif void z_impl_k_timer_stop(struct k_timer *timer) { int inactive = z_abort_timeout(&timer->timeout) != 0; if (inactive) { return; } if (timer->stop_fn != NULL) { timer->stop_fn(timer); } struct k_thread *pending_thread = z_unpend1_no_timeout(&timer->wait_q); if (pending_thread != NULL) { z_ready_thread(pending_thread); z_reschedule_unlocked(); } } #ifdef CONFIG_USERSPACE Z_SYSCALL_HANDLER1_SIMPLE_VOID(k_timer_stop, K_OBJ_TIMER, struct k_timer *); #endif u32_t z_impl_k_timer_status_get(struct k_timer *timer) { k_spinlock_key_t key = k_spin_lock(&lock); u32_t result = timer->status; timer->status = 0U; k_spin_unlock(&lock, key); return result; } #ifdef CONFIG_USERSPACE Z_SYSCALL_HANDLER1_SIMPLE(k_timer_status_get, K_OBJ_TIMER, struct k_timer *); #endif u32_t z_impl_k_timer_status_sync(struct k_timer *timer) { __ASSERT(!z_is_in_isr(), ""); k_spinlock_key_t key = k_spin_lock(&lock); u32_t result = timer->status; if (result == 0U) { if (!z_is_inactive_timeout(&timer->timeout)) { /* wait for timer to expire or stop */ (void)z_pend_curr(&lock, key, &timer->wait_q, K_FOREVER); /* get updated timer status */ key = k_spin_lock(&lock); result = timer->status; } else { /* timer is already stopped */ } } else { /* timer has already expired at least once */ } timer->status = 0U; k_spin_unlock(&lock, key); return result; } #ifdef CONFIG_USERSPACE Z_SYSCALL_HANDLER1_SIMPLE(k_timer_status_sync, K_OBJ_TIMER, struct k_timer *); #endif #ifdef CONFIG_USERSPACE Z_SYSCALL_HANDLER1_SIMPLE(k_timer_remaining_get, K_OBJ_TIMER, struct k_timer *); Z_SYSCALL_HANDLER1_SIMPLE(k_timer_user_data_get, K_OBJ_TIMER, struct k_timer *); Z_SYSCALL_HANDLER(k_timer_user_data_set, timer, user_data) { Z_OOPS(Z_SYSCALL_OBJ(timer, K_OBJ_TIMER)); z_impl_k_timer_user_data_set((struct k_timer *)timer, (void *)user_data); return 0; } #endif