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45 lines
1.1 KiB
Markdown
45 lines
1.1 KiB
Markdown
# TaskGroup::AddDependency
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```cpp
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void AddDependency(uint64_t taskId, uint64_t dependsOn)
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```
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为任务添加依赖关系。被依赖的任务必须先完成，当前任务才会开始执行。
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**参数：**
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- `taskId` - 任务 ID（需要等待的任务）
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- `dependsOn` - 依赖的父任务 ID
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**返回：** 无
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**复杂度：** O(1)
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**注意：**
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- 如果被依赖的任务不存在或已完成，调用无效果。
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- 支持添加多个依赖，但不支持循环依赖。
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**示例：**
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```cpp
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TaskGroup* group = TaskSystem::Get().CreateTaskGroup();
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uint64_t init = group->AddTask([]() { Initialize(); });
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uint64_t task1 = group->AddTask([]() { Phase1(); });
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uint64_t task2 = group->AddTask([]() { Phase2(); });
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uint64_t cleanup = group->AddTask([]() { Cleanup(); });
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// task1 和 task2 依赖 init
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group->AddDependency(task1, init);
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group->AddDependency(task2, init);
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// cleanup 依赖 task1 和 task2
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group->AddDependency(cleanup, task1);
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group->AddDependency(cleanup, task2);
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group->Wait();
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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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