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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2026 Richard QIn
*/
#pragma once
#include "common/types.h"
struct cpu;
// Spinlock
// Features: Non-interruptible, busy-wait loop, extremely short hold time.
// Scenario: Protecting core data such as scheduler, interrupt handling, PMM, etc.
class Spinlock
{
public:
volatile uint32 locked; // Whether it is locked (0: unlocked, 1: locked)
const char *name; // Lock Name (for debugging)
struct cpu *cpu; // The CPU holding the lock
// Constructor
Spinlock() : locked(0), name("uninit"), cpu(nullptr) {}
// Initialize lock name
void init(const char *name);
// Acquire lock
void acquire();
// Release lock
void release();
// Check if the current CPU holds the lock
bool holding();
};
// Mutex
// Features: Allows interruption, allows sleeping (yield CPU), can hold for a long time.
// Scenarios: File system IO, device driver waiting, long-term buffering operations.
class Mutex
{
public:
uint32 locked; // Whether it is locked
const char *name; // Lock Name
int pid; // PID of the process holding the lock (for debugging)
Spinlock lk; // Internal spin lock, protects the state of the Mutex itself
void init(const char *name);
void acquire();
void release();
bool holding();
};
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