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https://github.com/projectacrn/acrn-hypervisor.git
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1f23fe3fd8
This simple event implemention can only support exclusive waiting at same time. It mainly used by thread who want to wait for special event happens. Thread A who want to wait for some events calls wait_event(struct sched_event *); Thread B who can give the event signal calls signal_event(struct sched_event *); Tracked-On: #4329 Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <cpu.h>
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#include <schedule.h>
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#include <event.h>
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#include <logmsg.h>
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void init_event(struct sched_event *event)
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{
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spinlock_init(&event->lock);
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event->set = false;
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event->waiting_thread = NULL;
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}
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void reset_event(struct sched_event *event)
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{
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uint64_t rflag;
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spinlock_irqsave_obtain(&event->lock, &rflag);
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event->set = false;
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event->waiting_thread = NULL;
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spinlock_irqrestore_release(&event->lock, rflag);
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}
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/* support exclusive waiting only */
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void wait_event(struct sched_event *event)
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{
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uint64_t rflag;
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spinlock_irqsave_obtain(&event->lock, &rflag);
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ASSERT((event->waiting_thread == NULL), "only support exclusive waiting");
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while (!event->set) {
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event->waiting_thread = sched_get_current(get_pcpu_id());
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sleep_thread(event->waiting_thread);
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spinlock_irqrestore_release(&event->lock, rflag);
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schedule();
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spinlock_irqsave_obtain(&event->lock, &rflag);
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}
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event->set = false;
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event->waiting_thread = NULL;
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spinlock_irqrestore_release(&event->lock, rflag);
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}
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void signal_event(struct sched_event *event)
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{
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uint64_t rflag;
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spinlock_irqsave_obtain(&event->lock, &rflag);
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event->set = true;
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if (event->waiting_thread != NULL) {
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wake_thread(event->waiting_thread);
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}
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spinlock_irqrestore_release(&event->lock, rflag);
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}
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