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Synchronize source files from linuxdeepin/dtkgui.

Source-pull-request: linuxdeepin/dtkgui#346

Synchronize source files from linuxdeepin/dtkgui.

Source-pull-request: linuxdeepin/dtkgui#346
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deepin pr auto review

这段代码是关于单例实现的修改,我来分析一下改进前后的变化和可能存在的问题:

语法逻辑

  1. 修改前:先创建lockfile并处理路径,再在Linux系统下添加pid namespace信息
  2. 修改后:先处理pid namespace信息,再创建lockfile并处理路径

改进点

  1. 修改后的代码逻辑更合理,先完成key的完整构造(包括pid namespace),再进行路径处理
  2. 将socket_key的修改提前,确保后续的lockfile构建使用完整的key

潜在问题

  1. 线程安全问题:static QScopedPointer lock(new QLockFile(lockfile)) 在多线程环境下可能存在竞态条件
  2. 资源管理:使用QScopedPointer管理QLockFile是好的做法,但需要注意lock的生命周期
  3. 路径处理:路径拼接逻辑可能在某些极端情况下(如超长路径)出现问题

改进建议

  1. 线程安全
static QMutex lockMutex;
QMutexLocker locker(&lockMutex);
static QScopedPointer<QLockFile> lock;
if (!lock) {
    lock.reset(new QLockFile(lockfile));
}
  1. 错误处理
if (!lock->tryLock()) {
    qWarning() << "Failed to lock single instance file:" << lockfile;
    return false;
}
  1. 路径处理优化
QString lockfile = socket_key;
if (!lockfile.startsWith(QLatin1Char('/'))) {
    QDir tempDir = QDir::temp();
    if (!tempDir.exists()) {
        qWarning() << "Temp directory does not exist";
        return false;
    }
    lockfile = tempDir.absoluteFilePath(socket_key);
}
  1. 代码可读性
    建议将lockfile的构造逻辑提取为一个单独的函数:
static QString generateLockFile(const QString &socket_key)
{
    QString lockfile = socket_key;
    if (!lockfile.startsWith(QLatin1Char('/'))) {
        QDir tempDir = QDir::temp();
        if (!tempDir.exists()) {
            qWarning() << "Temp directory does not exist";
            return QString();
        }
        lockfile = tempDir.absoluteFilePath(socket_key);
    }
    lockfile += QStringLiteral(".lock");
    return lockfile;
}
  1. 性能优化
    对于频繁调用的场景,可以考虑缓存lockfile路径,避免重复计算

总体来说,这次修改优化了代码逻辑顺序,但还需要注意线程安全、错误处理和边界情况的处理。建议采用上述改进建议来增强代码的健壮性和可靠性。

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  • 敏感词检查失败, 检测到1个文件存在敏感词
详情
{
    "src/kernel/dguiapplicationhelper.cpp": [
        {
            "line": "    QString socket_key = \"_d_dtk_single_instance_\";",
            "line_number": 1484,
            "rule": "S106",
            "reason": "Var naming | 2ad926d35b"
        }
    ]
}

@ComixHe ComixHe merged commit 2fbdd7b into master Oct 16, 2025
11 of 15 checks passed
@ComixHe ComixHe deleted the sync-pr-346-nosync branch October 16, 2025 05:14
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3 participants