52 lines
1 KiB
C
52 lines
1 KiB
C
#pragma once
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#include "types.h"
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struct spinlock;
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// spinlock.c
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/**
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* Acquire the lock.
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* Loops (spins) until the lock is acquired.
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* Panics if the lock is already held by this cpu.
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*/
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void acquire(struct spinlock *);
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/**
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* Check whether this cpu is holding the lock.
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* Interrupts must be off.
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*/
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int holding(struct spinlock *);
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/**
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* Initialize spinlock
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*/
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void initlock(struct spinlock *, char *);
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/**
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* Release the lock.
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* Panics if the lock is not held.
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*/
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void release(struct spinlock *);
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/**
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* @brief push_off/pop_off are like intr_off()/intr_on() except that they are matched:
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* it takes two pop_off()s to undo two push_off()s. Also, if interrupts
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* are initially off, then push_off, pop_off leaves them off.
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*/
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void push_off(void);
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/** @copydoc pop_off */
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void pop_off(void);
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/** Mutual exclusion spin lock */
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struct spinlock {
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u32 locked; // Is the lock held?
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// NOTE: Perhaps feature gate this?
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// For debugging:
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char *name; // Name of lock.
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struct cpu *cpu; // The cpu holding the lock.
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};
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