52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
#include "SingleInstanceManager.h"
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#include <QDebug>
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SingleInstanceManager::SingleInstanceManager(const QString& appKey)
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: m_appKey(appKey)
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, m_semaphore(nullptr)
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, m_sharedMemory(nullptr)
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, m_isRunning(false)
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{
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// 创建系统信号量，用于同步访问共享内存
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m_semaphore = std::make_unique<QSystemSemaphore>(appKey + "_semaphore", 1);
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m_semaphore->acquire(); // 获取信号量
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// 创建共享内存对象
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m_sharedMemory = std::make_unique<QSharedMemory>(appKey + "_memory");
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// 尝试附加到现有的共享内存
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if (m_sharedMemory->attach()) {
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// 如果能够附加，说明已有实例在运行
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m_isRunning = true;
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} else {
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// 尝试创建新的共享内存
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if (!m_sharedMemory->create(1)) {
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// 创建失败，可能是因为已经存在
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qDebug() << "Unable to create shared memory segment:" << m_sharedMemory->errorString();
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m_isRunning = true;
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} else {
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// 成功创建，当前是唯一实例
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m_isRunning = false;
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}
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}
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m_semaphore->release(); // 释放信号量
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}
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SingleInstanceManager::~SingleInstanceManager()
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{
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release();
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}
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bool SingleInstanceManager::isAnotherInstanceRunning() const
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{
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return m_isRunning;
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}
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void SingleInstanceManager::release()
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{
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if (m_sharedMemory) {
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m_sharedMemory->detach();
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}
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}
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