ZerOS Kernel Module and Drive Development Guide

This skill provides comprehensive guidance for developing kernel modules and drive extensions in ZerOS. Kernel modules are core system components that provide fundamental functionality to the operating system.

Overview

What are Kernel Modules?

Kernel modules are core system components that:

•Located in kernel/ directory (core modules, filesystem, memory, process, drive)
•Or system/ui/ directory (UI management modules)
•Loaded during system boot by BootLoader
•Managed by DependencyConfig (dependency management)
•Provide system-level functionality
•Run with kernel privileges (no permission checks needed)

Key Characteristics

•Static Class Design: Modules use static classes with static methods
•No Process: Modules don't have PID, run in kernel context
•Auto-initialization: Automatically initialized on load
•POOL Registration: Registered to POOL for module access
•Dependency Management: Dependencies declared in bootloader/starter.js
•Signal Publishing: Must publish load signal after initialization

Module Types

Core Modules

Location: kernel/core/

Purpose: Foundation modules (logger, dependency management, type pools)

Examples:

•kernel/core/logger/kernelLogger.js - Logging system
•kernel/core/signal/dependencyConfig.js - Dependency management
•kernel/core/signal/pool.js - Object pool
•kernel/core/typePool/ - Type pools (enum definitions)

Filesystem Modules

Location: kernel/filesystem/

Purpose: File system functionality (disk, file tree, file framework)

Examples:

•kernel/filesystem/disk.js - Virtual disk management
•kernel/filesystem/nodeTree.js - File tree structure
•kernel/filesystem/fileFramework.js - File object template
•kernel/filesystem/init.js - Filesystem initialization

Memory Management Modules

Location: kernel/memory/

Purpose: Memory allocation and management (heap, stack, memory manager)

Examples:

•kernel/memory/heap.js - Heap memory management
•kernel/memory/shed.js - Stack memory management
•kernel/memory/memoryManager.js - Unified memory manager
•kernel/memory/kernelMemory.js - Kernel dynamic data storage

Process Management Modules

Location: kernel/process/

Purpose: Process lifecycle management (process manager, permissions)

Examples:

•kernel/process/processManager.js - Process lifecycle management
•kernel/process/permissionManager.js - Permission management
•kernel/process/applicationAssetManager.js - Application resource management

Drive Modules

Location: kernel/drive/

Purpose: System drivers (network, storage, encryption, multithreading, etc.)

Examples:

•kernel/drive/LStorage.js - Local storage driver
•kernel/drive/cacheDrive.js - Cache driver
•kernel/drive/cryptDrive.js - Encryption driver
•kernel/drive/multithreadingDrive.js - Multithreading driver
•kernel/drive/networkManager.js - Network management driver
•kernel/drive/speechDrive.js - Speech recognition driver
•kernel/drive/dragDrive.js - Drag and drop driver
•kernel/drive/geographyDrive.js - Geography location driver

UI Modules

Location: system/ui/

Purpose: User interface management (GUI manager, taskbar, notifications)

Examples:

•system/ui/guiManager.js - GUI window management
•system/ui/taskbarManager.js - Taskbar management
•system/ui/notificationManager.js - Notification management
•system/ui/eventManager.js - Event management

Module Structure

Complete Template

javascript

// kernel/drive/myDrive.js
// My Drive Module
// Dependencies: KernelLogger (loaded in HTML), LStorage

KernelLogger.info("MyDrive", "模块初始化");

class MyDrive {
    // ==================== Initialization Flag ====================
    static _initialized = false;
    static _initializing = false;  // Prevent concurrent initialization
    
    // ==================== Internal State ====================
    static _state = {
        config: null,
        cache: new Map(),
        // Add other state properties
    };
    
    // ==================== Constants ====================
    static DEFAULT_CONFIG = {
        enabled: true,
        timeout: 5000
    };
    
    // ==================== Initialization ====================
    
    /**
     * Initialize module
     */
    static init() {
        if (MyDrive._initialized) {
            KernelLogger.warn("MyDrive", "模块已初始化，跳过重复初始化");
            return;
        }
        
        if (MyDrive._initializing) {
            KernelLogger.warn("MyDrive", "模块正在初始化中，跳过重复初始化");
            return;
        }
        
        MyDrive._initializing = true;
        
        try {
            // 1. Load configuration
            MyDrive._loadConfig();
            
            // 2. Initialize internal state
            MyDrive._initState();
            
            // 3. Register to POOL
            MyDrive._registerToPool();
            
            // 4. Mark as initialized
            MyDrive._initialized = true;
            
            KernelLogger.info("MyDrive", "模块初始化完成");
        } catch (error) {
            KernelLogger.error("MyDrive", "模块初始化失败", error);
            // Don't throw error, allow system to continue
            // Or throw based on criticality
        } finally {
            MyDrive._initializing = false;
        }
    }
    
    // ==================== Signal Publishing ====================
    
    /**
     * Publish load signal (call after initialization)
     * Notifies dependency manager that module has loaded
     */
    static _publishLoadSignal() {
        // Prefer DependencyConfig.publishSignal
        if (typeof DependencyConfig !== 'undefined' && DependencyConfig && typeof DependencyConfig.publishSignal === 'function') {
            DependencyConfig.publishSignal("../kernel/drive/myDrive.js");
        } else if (typeof document !== 'undefined' && document.body) {
            // Fallback: dispatch event directly
            document.body.dispatchEvent(
                new CustomEvent("dependencyLoaded", {
                    detail: {
                        name: "../kernel/drive/myDrive.js",
                    },
                })
            );
            KernelLogger.debug("MyDrive", "已发布依赖加载信号（降级方案）");
        } else {
            // Delay signal publishing
            if (document.readyState === 'loading') {
                document.addEventListener('DOMContentLoaded', () => {
                    MyDrive._publishLoadSignal();
                });
            } else {
                setTimeout(() => {
                    MyDrive._publishLoadSignal();
                }, 0);
            }
        }
    }
    
    // ==================== Configuration Management ====================
    
    /**
     * Load configuration from LStorage
     */
    static _loadConfig() {
        try {
            if (typeof LStorage !== 'undefined') {
                const config = LStorage.getSystemStorage('system.myDriveConfig');
                if (config) {
                    MyDrive._state.config = Object.assign({}, MyDrive.DEFAULT_CONFIG, config);
                    KernelLogger.debug("MyDrive", "已加载配置", MyDrive._state.config);
                } else {
                    MyDrive._state.config = Object.assign({}, MyDrive.DEFAULT_CONFIG);
                }
            } else {
                MyDrive._state.config = Object.assign({}, MyDrive.DEFAULT_CONFIG);
            }
        } catch (error) {
            KernelLogger.warn("MyDrive", "加载配置失败，使用默认配置", error);
            MyDrive._state.config = Object.assign({}, MyDrive.DEFAULT_CONFIG);
        }
    }
    
    /**
     * Save configuration to LStorage
     */
    static _saveConfig() {
        try {
            if (typeof LStorage !== 'undefined') {
                LStorage.setSystemStorage('system.myDriveConfig', MyDrive._state.config);
                KernelLogger.debug("MyDrive", "已保存配置");
            }
        } catch (error) {
            KernelLogger.warn("MyDrive", "保存配置失败", error);
        }
    }
    
    // ==================== State Management ====================
    
    /**
     * Initialize internal state
     */
    static _initState() {
        // Initialize internal state
        MyDrive._state.cache.clear();
        // Add other initialization logic
    }
    
    // ==================== POOL Registration ====================
    
    /**
     * Register module to POOL
     */
    static _registerToPool() {
        if (typeof POOL !== 'undefined' && POOL && typeof POOL.__SET__ === 'function') {
            try {
                // Ensure pool category exists
                if (!POOL.__HAS__("KERNEL_GLOBAL_POOL")) {
                    POOL.__INIT__("KERNEL_GLOBAL_POOL");
                }
                POOL.__SET__("KERNEL_GLOBAL_POOL", "MyDrive", MyDrive);
                KernelLogger.debug("MyDrive", "已注册到 POOL");
            } catch (e) {
                KernelLogger.warn("MyDrive", `注册到 POOL 失败: ${e.message}`);
            }
        }
    }
    
    // ==================== Public API ====================
    
    /**
     * Execute operation
     * @param {string} param Parameter
     * @returns {Promise<any>} Result
     */
    static async doSomething(param) {
        if (!MyDrive._initialized) {
            KernelLogger.warn("MyDrive", "模块未初始化，无法执行操作");
            throw new Error("MyDrive 模块未初始化");
        }
        
        try {
            KernelLogger.debug("MyDrive", `执行操作: ${param}`);
            
            // Implementation logic
            const result = await MyDrive._executeOperation(param);
            
            KernelLogger.info("MyDrive", "操作执行成功");
            return result;
        } catch (error) {
            KernelLogger.error("MyDrive", "操作执行失败", error);
            throw error;
        }
    }
    
    /**
     * Execute operation (private method)
     */
    static async _executeOperation(param) {
        // Implementation logic
        return { success: true, data: param };
    }
    
    /**
     * Get configuration
     * @returns {Object} Configuration object (copy)
     */
    static getConfig() {
        return Object.assign({}, MyDrive._state.config);
    }
    
    /**
     * Set configuration
     * @param {Object} newConfig New configuration
     */
    static setConfig(newConfig) {
        if (!newConfig || typeof newConfig !== 'object') {
            throw new Error("Configuration must be an object");
        }
        
        MyDrive._state.config = Object.assign({}, MyDrive._state.config, newConfig);
        MyDrive._saveConfig();
        
        KernelLogger.info("MyDrive", "配置已更新", MyDrive._state.config);
    }
    
    /**
     * Cleanup resources
     */
    static cleanup() {
        if (!MyDrive._initialized) {
            return;
        }
        
        try {
            // Clear cache
            MyDrive._state.cache.clear();
            
            KernelLogger.info("MyDrive", "资源清理完成");
        } catch (error) {
            KernelLogger.error("MyDrive", "资源清理失败", error);
        }
    }
}

// Auto-initialize (if module is loaded)
if (typeof KernelLogger !== 'undefined') {
    // Delay initialization to ensure dependencies are loaded
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', () => {
            MyDrive.init();
            MyDrive._publishLoadSignal();
        });
    } else {
        // DOM already loaded, initialize directly
        MyDrive.init();
        MyDrive._publishLoadSignal();
    }
}

// Export to global scope (if POOL unavailable)
if (typeof window !== 'undefined') {
    window.MyDrive = MyDrive;
} else if (typeof globalThis !== 'undefined') {
    globalThis.MyDrive = MyDrive;
}

Dependency Management

Declaring Dependencies

All module dependencies must be declared in bootloader/starter.js:

javascript

// bootloader/starter.js
const MODULE_DEPENDENCIES = {
    // Your module
    "../kernel/drive/myDrive.js": [
        "../kernel/core/logger/kernelLogger.js",  // Dependency: KernelLogger
        "../kernel/drive/LStorage.js",            // Dependency: LStorage
        "../kernel/process/processManager.js"     // Dependency: ProcessManager
    ],
};

Rules:

•Key: Module file path (relative to test/index.html)
•Value: Array of dependency module paths
•Empty array [] means no dependencies (or only depends on modules loaded in HTML)

Waiting for Dependencies

If module needs to wait for dependencies:

javascript

static async init() {
    if (MyDrive._initialized) return;
    
    // Wait for dependency module to load
    const Dependency = POOL.__GET__("KERNEL_GLOBAL_POOL", "Dependency");
    if (Dependency && typeof Dependency.waitLoaded === 'function') {
        try {
            await Dependency.waitLoaded("../kernel/drive/LStorage.js", {
                interval: 50,
                timeout: 5000
            });
        } catch (error) {
            KernelLogger.error("MyDrive", "等待依赖加载失败", error);
            // Decide whether to continue or fail
        }
    }
    
    // Check if dependency is available
    if (typeof LStorage === 'undefined') {
        KernelLogger.warn("MyDrive", "LStorage 不可用，使用降级方案");
        // Use fallback or fail initialization
    }
    
    // Continue initialization
    MyDrive._initialized = true;
}

Checking Dependencies

Check dependency availability in methods:

javascript

static doSomething() {
    // Check dependency
    if (typeof LStorage === 'undefined') {
        KernelLogger.warn("MyDrive", "LStorage 不可用，无法执行操作");
        return;
    }
    
    // Use dependency
    const data = LStorage.getSystemStorage('key');
}

POOL Registration

Registering to POOL

Modules should register to POOL for access by other modules:

javascript

static _registerToPool() {
    if (typeof POOL !== 'undefined' && POOL && typeof POOL.__SET__ === 'function') {
        try {
            // Ensure pool category exists
            if (!POOL.__HAS__("KERNEL_GLOBAL_POOL")) {
                POOL.__INIT__("KERNEL_GLOBAL_POOL");
            }
            POOL.__SET__("KERNEL_GLOBAL_POOL", "MyDrive", MyDrive);
            KernelLogger.debug("MyDrive", "已注册到 POOL");
        } catch (e) {
            KernelLogger.warn("MyDrive", `注册到 POOL 失败: ${e.message}`);
        }
    }
}

Accessing Other Modules from POOL

javascript

// Get module from POOL
const LStorage = POOL.__GET__("KERNEL_GLOBAL_POOL", "LStorage");
if (LStorage) {
    const data = LStorage.getSystemStorage('key');
}

// Get ProcessManager
const ProcessManager = POOL.__GET__("KERNEL_GLOBAL_POOL", "ProcessManager");
if (ProcessManager) {
    const processes = ProcessManager.listProcesses();
}

POOL Key Naming

•Use module class name as POOL key (e.g., "MyDrive")
•Keep naming consistent
•Avoid generic names (e.g., "Manager", "Service")

Logging

Using KernelLogger

CRITICAL: All kernel modules must use KernelLogger, never use console.log:

javascript

// ✅ Correct: Use KernelLogger
KernelLogger.info("MyDrive", "模块初始化");
KernelLogger.warn("MyDrive", "警告信息");
KernelLogger.error("MyDrive", "错误信息", error);
KernelLogger.debug("MyDrive", "调试信息");

// ❌ Wrong: Never use console.log
console.log("模块初始化");
console.warn("警告信息");
console.error("错误信息");

Log Levels

Use appropriate log levels:

javascript

// DEBUG - Detailed debugging information
KernelLogger.debug("MyDrive", "调试信息");

// INFO - General information (module initialization, operation completion)
KernelLogger.info("MyDrive", "模块初始化完成");

// WARN - Warning information (non-fatal errors)
KernelLogger.warn("MyDrive", "配置未找到，使用默认值");

// ERROR - Error information (fatal errors)
KernelLogger.error("MyDrive", "初始化失败", error);

Logging Best Practices

•Initialization: Use info level for module initialization
•Operation completion: Use info level for important operations
•Warnings: Use warn level for recoverable errors
•Fatal errors: Use error level for fatal errors, include error object
•Debugging: Use debug level for detailed debugging information

Signal Publishing

Why Publish Signals?

Modules must publish load signals to notify dependency manager:

javascript

// After initialization
MyDrive._publishLoadSignal();

Why:

•Notifies DependencyConfig that module has loaded
•Allows dependent modules to proceed
•Required for proper dependency resolution

Publishing Signal

javascript

static _publishLoadSignal() {
    // Prefer DependencyConfig.publishSignal
    if (typeof DependencyConfig !== 'undefined' && DependencyConfig && typeof DependencyConfig.publishSignal === 'function') {
        DependencyConfig.publishSignal("../kernel/drive/myDrive.js");
    } else if (typeof document !== 'undefined' && document.body) {
        // Fallback: dispatch event
        document.body.dispatchEvent(
            new CustomEvent("dependencyLoaded", {
                detail: {
                    name: "../kernel/drive/myDrive.js",
                },
            })
        );
    } else {
        // Delay signal publishing
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', () => {
                MyDrive._publishLoadSignal();
            });
        } else {
            setTimeout(() => {
                MyDrive._publishLoadSignal();
            }, 0);
        }
    }
}

Important: Module path must exactly match path in bootloader/starter.js

Memory Management

Using KernelMemory

For persistent kernel data:

javascript

// Save data
KernelMemory.saveData('MYDRIVE_CONFIG', config);

// Load data
const config = KernelMemory.loadData('MYDRIVE_CONFIG');

// Check if data exists
if (KernelMemory.hasData('MYDRIVE_CONFIG')) {
    const config = KernelMemory.loadData('MYDRIVE_CONFIG');
}

// Delete data
KernelMemory.deleteData('MYDRIVE_CONFIG');

Using LStorage

For system storage (registry-like):

javascript

// Save system storage
LStorage.setSystemStorage('system.myDriveConfig', config);

// Load system storage
const config = LStorage.getSystemStorage('system.myDriveConfig');

Process Memory

If module needs to allocate memory for processes (rare):

javascript

// Allocate heap memory for process
const heapId = MemoryManager.allocateHeap(pid, size);

// Allocate stack memory for process
const shedId = MemoryManager.allocateShed(pid, size);

Note: Kernel modules usually don't allocate process memory; this is ProcessManager's responsibility.

Common Patterns

Pattern 1: Simple Drive Module

javascript

// kernel/drive/simpleDrive.js
KernelLogger.info("SimpleDrive", "模块初始化");

class SimpleDrive {
    static _initialized = false;
    
    static init() {
        if (SimpleDrive._initialized) return;
        
        SimpleDrive._initialized = true;
        SimpleDrive._registerToPool();
        KernelLogger.info("SimpleDrive", "模块初始化完成");
    }
    
    static _registerToPool() {
        if (typeof POOL !== 'undefined' && POOL && typeof POOL.__SET__ === 'function') {
            POOL.__SET__("KERNEL_GLOBAL_POOL", "SimpleDrive", SimpleDrive);
        }
    }
    
    static doWork() {
        if (!SimpleDrive._initialized) {
            KernelLogger.warn("SimpleDrive", "模块未初始化");
            return;
        }
        KernelLogger.info("SimpleDrive", "执行工作");
    }
}

// Auto-initialize
if (typeof KernelLogger !== 'undefined') {
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', () => {
            SimpleDrive.init();
            SimpleDrive._publishLoadSignal();
        });
    } else {
        SimpleDrive.init();
        SimpleDrive._publishLoadSignal();
    }
}

Pattern 2: Drive with Configuration

javascript

// kernel/drive/configDrive.js
KernelLogger.info("ConfigDrive", "模块初始化");

class ConfigDrive {
    static _initialized = false;
    static _config = {
        enabled: true,
        timeout: 5000
    };
    
    static init() {
        if (ConfigDrive._initialized) return;
        
        try {
            ConfigDrive._loadConfig();
            ConfigDrive._initialized = true;
            ConfigDrive._registerToPool();
            KernelLogger.info("ConfigDrive", "模块初始化完成");
        } catch (error) {
            KernelLogger.error("ConfigDrive", "模块初始化失败", error);
        }
    }
    
    static _loadConfig() {
        if (typeof LStorage !== 'undefined') {
            const savedConfig = LStorage.getSystemStorage('system.configDriveConfig');
            if (savedConfig) {
                ConfigDrive._config = Object.assign({}, ConfigDrive._config, savedConfig);
            }
        }
    }
    
    static _registerToPool() {
        if (typeof POOL !== 'undefined' && POOL && typeof POOL.__SET__ === 'function') {
            POOL.__SET__("KERNEL_GLOBAL_POOL", "ConfigDrive", ConfigDrive);
        }
    }
    
    static getConfig() {
        return Object.assign({}, ConfigDrive._config);
    }
    
    static setConfig(newConfig) {
        ConfigDrive._config = Object.assign({}, ConfigDrive._config, newConfig);
        if (typeof LStorage !== 'undefined') {
            LStorage.setSystemStorage('system.configDriveConfig', ConfigDrive._config);
        }
    }
}

// Auto-initialize
if (typeof KernelLogger !== 'undefined') {
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', () => {
            ConfigDrive.init();
            ConfigDrive._publishLoadSignal();
        });
    } else {
        ConfigDrive.init();
        ConfigDrive._publishLoadSignal();
    }
}

Pattern 3: Drive with Dependencies

javascript

// kernel/drive/dependentDrive.js
KernelLogger.info("DependentDrive", "模块初始化");

class DependentDrive {
    static _initialized = false;
    
    static async init() {
        if (DependentDrive._initialized) return;
        
        try {
            // Wait for dependency
            const Dependency = POOL.__GET__("KERNEL_GLOBAL_POOL", "Dependency");
            if (Dependency && typeof Dependency.waitLoaded === 'function') {
                await Dependency.waitLoaded("../kernel/drive/LStorage.js", {
                    interval: 50,
                    timeout: 5000
                });
            }
            
            // Check dependency availability
            if (typeof LStorage === 'undefined') {
                throw new Error("LStorage 不可用");
            }
            
            DependentDrive._initialized = true;
            DependentDrive._registerToPool();
            KernelLogger.info("DependentDrive", "模块初始化完成");
        } catch (error) {
            KernelLogger.error("DependentDrive", "模块初始化失败", error);
        }
    }
    
    static _registerToPool() {
        if (typeof POOL !== 'undefined' && POOL && typeof POOL.__SET__ === 'function') {
            POOL.__SET__("KERNEL_GLOBAL_POOL", "DependentDrive", DependentDrive);
        }
    }
    
    static async doWork() {
        if (!DependentDrive._initialized) {
            KernelLogger.warn("DependentDrive", "模块未初始化");
            return;
        }
        
        // Check dependency
        if (typeof LStorage === 'undefined') {
            KernelLogger.warn("DependentDrive", "LStorage 不可用");
            return;
        }
        
        // Use dependency
        const data = LStorage.getSystemStorage('key');
        KernelLogger.info("DependentDrive", "执行工作", data);
    }
}

// Auto-initialize
if (typeof KernelLogger !== 'undefined') {
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', () => {
            DependentDrive.init().then(() => {
                DependentDrive._publishLoadSignal();
            });
        });
    } else {
        DependentDrive.init().then(() => {
            DependentDrive._publishLoadSignal();
        });
    }
}

Pattern 4: Drive with Process Cleanup

javascript

// kernel/drive/processAwareDrive.js
KernelLogger.info("ProcessAwareDrive", "模块初始化");

class ProcessAwareDrive {
    static _initialized = false;
    static _processSessions = new Map();  // Map<pid, session>
    
    static init() {
        if (ProcessAwareDrive._initialized) return;
        
        try {
            // Register cleanup handler with ProcessManager
            if (typeof ProcessManager !== 'undefined') {
                // ProcessManager will call cleanup on process exit
                // Implementation depends on ProcessManager API
            }
            
            ProcessAwareDrive._initialized = true;
            ProcessAwareDrive._registerToPool();
            KernelLogger.info("ProcessAwareDrive", "模块初始化完成");
        } catch (error) {
            KernelLogger.error("ProcessAwareDrive", "模块初始化失败", error);
        }
    }
    
    static createSession(pid, options) {
        if (!ProcessAwareDrive._initialized) {
            throw new Error("模块未初始化");
        }
        
        const session = {
            pid: pid,
            options: options,
            createdAt: Date.now()
        };
        
        ProcessAwareDrive._processSessions.set(pid, session);
        KernelLogger.debug("ProcessAwareDrive", `创建会话 PID: ${pid}`);
        
        return session;
    }
    
    static cleanupProcess(pid) {
        if (ProcessAwareDrive._processSessions.has(pid)) {
            ProcessAwareDrive._processSessions.delete(pid);
            KernelLogger.debug("ProcessAwareDrive", `清理进程会话 PID: ${pid}`);
        }
    }
    
    static _registerToPool() {
        if (typeof POOL !== 'undefined' && POOL && typeof POOL.__SET__ === 'function') {
            POOL.__SET__("KERNEL_GLOBAL_POOL", "ProcessAwareDrive", ProcessAwareDrive);
        }
    }
}

// Auto-initialize
if (typeof KernelLogger !== 'undefined') {
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', () => {
            ProcessAwareDrive.init();
            ProcessAwareDrive._publishLoadSignal();
        });
    } else {
        ProcessAwareDrive.init();
        ProcessAwareDrive._publishLoadSignal();
    }
}

Best Practices

1. Always Use KernelLogger

javascript

// ✅ Correct
KernelLogger.info("MyDrive", "模块初始化");

// ❌ Wrong
console.log("模块初始化");

2. Check Initialization State

javascript

static doSomething() {
    if (!MyDrive._initialized) {
        KernelLogger.warn("MyDrive", "模块未初始化，无法执行操作");
        throw new Error("MyDrive 模块未初始化");
    }
    // Implementation
}

3. Handle Errors Gracefully

javascript

static init() {
    try {
        // Initialization logic
        MyDrive._initialized = true;
        KernelLogger.info("MyDrive", "模块初始化完成");
    } catch (error) {
        KernelLogger.error("MyDrive", "模块初始化失败", error);
        // Don't throw error, allow system to continue
        // Or throw based on criticality
    }
}

4. Register to POOL

javascript

static _registerToPool() {
    if (typeof POOL !== 'undefined' && POOL && typeof POOL.__SET__ === 'function') {
        try {
            if (!POOL.__HAS__("KERNEL_GLOBAL_POOL")) {
                POOL.__INIT__("KERNEL_GLOBAL_POOL");
            }
            POOL.__SET__("KERNEL_GLOBAL_POOL", "MyDrive", MyDrive);
        } catch (e) {
            KernelLogger.warn("MyDrive", `注册到 POOL 失败: ${e.message}`);
        }
    }
}

5. Publish Load Signal

javascript

// After initialization
MyDrive._publishLoadSignal();

6. Declare Dependencies

javascript

// bootloader/starter.js
const MODULE_DEPENDENCIES = {
    "../kernel/drive/myDrive.js": [
        "../kernel/core/logger/kernelLogger.js",
        "../kernel/drive/LStorage.js"
    ],
};

7. Use Static Class Design

javascript

// ✅ Correct: Static class
class MyDrive {
    static _initialized = false;
    static init() { /* ... */ }
    static doSomething() { /* ... */ }
}

// ❌ Wrong: Instance class (for kernel modules)
class MyDrive {
    constructor() { /* ... */ }
    init() { /* ... */ }
}

8. Prevent Duplicate Initialization

javascript

static _initialized = false;
static _initializing = false;

static init() {
    if (MyDrive._initialized) return;
    if (MyDrive._initializing) return;
    
    MyDrive._initializing = true;
    try {
        // Initialization logic
        MyDrive._initialized = true;
    } finally {
        MyDrive._initializing = false;
    }
}

9. Check Module Availability

javascript

static doSomething() {
    // Check if dependency is available
    if (typeof LStorage === 'undefined') {
        KernelLogger.warn("MyDrive", "LStorage 不可用");
        return;
    }
    
    // Use dependency
    const data = LStorage.getSystemStorage('key');
}

10. Clean Up Resources

javascript

static cleanup() {
    if (!MyDrive._initialized) return;
    
    try {
        // Clear cache
        MyDrive._state.cache.clear();
        
        // Remove event listeners
        // Clear timers
        // etc.
        
        KernelLogger.info("MyDrive", "资源清理完成");
    } catch (error) {
        KernelLogger.error("MyDrive", "资源清理失败", error);
    }
}

File Location and Directory Selection

Directory Structure

code

kernel/
├── core/              # Core modules
│   ├── logger/        # Logging system
│   ├── signal/        # Dependency management, POOL
│   ├── typePool/      # Type pools (enums)
│   ├── exceptionHM/   # Exception handling
│   ├── safemode/      # Safe mode
│   └── usercontrol/   # User control
├── filesystem/        # Filesystem modules
├── memory/            # Memory management modules
├── process/           # Process management modules
├── drive/             # Drive modules
└── dynamicModule/     # Dynamic module management

system/ui/             # UI modules
├── guiManager.js
├── taskbarManager.js
├── notificationManager.js
└── eventManager.js

Choosing Directory

Module Type	Directory	Example
Core functionality	`kernel/core/`	Logger, dependency management
Filesystem	`kernel/filesystem/`	Disk, file tree
Memory	`kernel/memory/`	Heap, stack, memory manager
Process	`kernel/process/`	Process manager, permissions
Drive	`kernel/drive/`	Network, storage, encryption
UI	`system/ui/`	GUI manager, taskbar

Testing

Manual Testing

•Place module file in appropriate directory
•Declare dependencies in bootloader/starter.js
•Restart system or reload page
•Check browser console for initialization logs
•Test module methods in browser console

Browser Console Testing

javascript

// Check if module is loaded
if (typeof MyDrive !== 'undefined') {
    // Check if initialized
    if (MyDrive._initialized) {
        // Call module methods
        MyDrive.doSomething();
    } else {
        // Manually initialize
        MyDrive.init();
    }
}

// Check POOL registration
const MyDrive = POOL.__GET__("KERNEL_GLOBAL_POOL", "MyDrive");
if (MyDrive) {
    MyDrive.doSomething();
}

Common Issues and Solutions

Issue: Module not loading

Cause: Dependency not declared or path incorrect

Solution:

•Check dependencies in bootloader/starter.js
•Verify module path matches exactly
•Check console for loading errors

Issue: "模块未初始化"

Cause: Module not initialized or initialization failed

Solution:

•Check initialization logs
•Verify dependencies are loaded
•Check for initialization errors

Issue: Dependency not available

Cause: Dependency not loaded or wrong path

Solution:

•Check dependency declaration
•Wait for dependency using waitLoaded
•Check dependency availability before use

Issue: POOL registration fails

Cause: POOL not available or category not initialized

Solution:

•Check POOL availability
•Initialize category if needed
•Handle registration errors gracefully

Issue: Signal not published

Cause: Forgot to call _publishLoadSignal()

Solution: Always call _publishLoadSignal() after initialization

Differences: Kernel Modules vs Programs

Feature	Kernel Module	Program
Location	`kernel/` or `system/ui/`	`system/service/DISK/D/application/`
Lifecycle	Loaded on boot, unloaded on shutdown	Started/stopped by user or system
Management	DependencyConfig	ProcessManager
Initialization	`init()` static method	`__init__()` instance method
PID	No PID	Has PID
Permissions	No permissions needed (kernel privilege)	Must declare permissions
Purpose	System functionality	User functionality

References

•Kernel Developer Guide: docs/KERNEL_DEVELOPER_GUIDE.md
•ZerOS Kernel: docs/ZEROS_KERNEL.md
•System Flow: docs/SYSTEM_FLOW.md
•DependencyConfig API: docs/API/DependencyConfig.md
•Pool API: docs/API/Pool.md
•KernelLogger API: docs/API/KernelLogger.md
•Kernel Interaction Skill: dev/skill/zeros-kernel-interaction/SKILL.md