90 lines
1.9 KiB
Markdown
90 lines
1.9 KiB
Markdown
# TaskGroup::WaitFor
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```cpp
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bool WaitFor(std::chrono::milliseconds timeout);
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```
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等待任务组中的所有任务完成，最多等待指定的超时时间。
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**参数：**
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- `timeout` - 最大等待时间
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**返回：**
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- `true` - 所有任务在超时前已完成
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- `false` - 等待超时，仍有任务未完成
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**线程安全：** ✅ 线程安全
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**示例：**
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```cpp
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#include "XCEngine/Threading/TaskGroup.h"
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#include "XCEngine/Threading/Task.h"
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#include <iostream>
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#include <chrono>
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using namespace XCEngine::Threading;
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int main() {
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TaskGroup group;
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group.AddTask([]() {
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std::this_thread::sleep_for(std::chrono::seconds(5));
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std::cout << "Long running task completed\n";
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});
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std::cout << "Waiting with 1 second timeout...\n";
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if (group.WaitFor(std::chrono::milliseconds(1000))) {
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std::cout << "All tasks completed within timeout\n";
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} else {
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std::cout << "Timeout! Some tasks still running.\n";
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}
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group.Wait();
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std::cout << "All tasks finally completed after second wait.\n";
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return 0;
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}
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```
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## 相关文档
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- [TaskGroup 总览](task-group.md) - 返回类总览
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- [Wait](wait.md) - 无限等待
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## 详细描述
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`WaitFor` 方法会阻塞当前线程，直到所有任务完成或超过指定的超时时间。
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## 参数
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| 参数 | 类型 | 描述 |
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|------|------|------|
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| `timeout` | `std::chrono::milliseconds` | 超时时间（毫秒） |
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## 返回值
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返回 `bool` 类型：
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- `true`: 所有任务在超时前完成
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- `false`: 发生超时
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## 示例
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```cpp
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TaskGroup* group = TaskSystem::Get().CreateTaskGroup();
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group->AddTask([]() {
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std::this_thread::sleep_for(std::chrono::seconds(5));
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});
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// 等待3秒超时
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if (group->WaitFor(std::chrono::milliseconds(3000))) {
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printf("All tasks completed on time\n");
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} else {
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printf("Wait timed out\n");
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}
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TaskSystem::Get().DestroyTaskGroup(group);
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```
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