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70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
#pragma once
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#include <common/atomic.h>
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#include <common/spinlock.h>
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#include <common/glib.h>
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#include <process/process.h>
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/**
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* @brief Mutex - 互斥锁
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*
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* - 同一时间只有1个任务可以持有mutex
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* - 不允许递归地加锁、解锁
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* - 只允许通过mutex的api来操作mutex
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* - 在硬中断、软中断中不能使用mutex
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*/
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typedef struct
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{
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atomic_t count; // 锁计数。1->已解锁。 0->已上锁,且有可能存在等待者
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spinlock_t wait_lock; // mutex操作锁，用于对mutex的list的操作进行加锁
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struct List wait_list; // Mutex的等待队列
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} mutex_t;
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/**
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* @brief 在mutex上的等待者的结构体
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*
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*/
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struct mutex_waiter_t
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{
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struct List list;
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struct process_control_block *pcb;
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};
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/**
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* @brief 初始化互斥量
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*
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* @param lock mutex结构体
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*/
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void mutex_init(mutex_t *lock);
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/**
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* @brief 对互斥量加锁
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*
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* @param lock mutex结构体
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*/
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void mutex_lock(mutex_t *lock);
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/**
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* @brief 对互斥量解锁
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*
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* @param lock mutex结构体
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*/
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void mutex_unlock(mutex_t *lock);
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/**
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* @brief 尝试对互斥量加锁
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*
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* @param lock mutex结构体
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*
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* @return 成功加锁->1, 加锁失败->0
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*/
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int mutex_trylock(mutex_t *lock);
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/**
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* @brief 判断mutex是否已被加锁
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*
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* @return 已加锁->1, 未加锁->0
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*/
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#define mutex_is_locked(lock) ((atomic_read(&(lock)->count) == 1) ? 0 : 1)
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