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104 lines
2.5 KiB
104 lines
2.5 KiB
5 months ago
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/******************************************************************************
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* Copyright (c) 2015-2024 jiangxiaogang<kerndev@foxmail.com>
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*
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* This file is part of KLite distribution.
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*
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* KLite is free software, you can redistribute it and/or modify it under
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* the MIT Licence.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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******************************************************************************/
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#include "internal.h"
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#include "kernel.h"
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struct sem
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{
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struct tcb_list list;
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uint32_t value;
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};
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sem_t sem_create(uint32_t value)
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{
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struct sem *sem;
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sem = heap_alloc(NULL, sizeof(struct sem));
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if(sem != NULL)
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{
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memset(sem, 0, sizeof(struct sem));
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sem->value = value;
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}
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return (sem_t)sem;
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}
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void sem_delete(sem_t sem)
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{
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heap_free(NULL, sem);
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}
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void sem_post(sem_t sem)
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{
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cpu_enter_critical();
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if(sched_tcb_wake_from(&sem->list))
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{
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sched_preempt(false);
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cpu_leave_critical();
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return;
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}
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sem->value++;
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cpu_leave_critical();
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}
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void sem_wait(sem_t sem)
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{
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cpu_enter_critical();
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if(sem->value > 0)
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{
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sem->value--;
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cpu_leave_critical();
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return;
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}
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sched_tcb_wait(sched_tcb_now, &sem->list);
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sched_switch();
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cpu_leave_critical();
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}
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uint32_t sem_timed_wait(sem_t sem, uint32_t timeout)
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{
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cpu_enter_critical();
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if(sem->value > 0)
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{
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sem->value--;
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cpu_leave_critical();
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return true;
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}
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if(timeout == 0)
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{
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cpu_leave_critical();
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return false;
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}
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sched_tcb_timed_wait(sched_tcb_now, &sem->list, timeout);
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sched_switch();
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cpu_leave_critical();
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return sched_tcb_now->timeout;
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}
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uint32_t sem_value(sem_t sem)
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{
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return sem->value;
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}
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