[Dataloader] Fix _DataLoaderIterMultiProcess/_DataLoaderIterSingleProcess has no attribute 'shudown'

[HydrogenSulfate]

PR Category

User Experience

PR Types

Bug fixes

Description

Pcard-75624

1. 修复_DataLoaderIterMultiProcess/_DataLoaderIterSingleProcess遇到报错问题时，可能会触发提示：has no attribute '_shutdown' attribute，其原因在于_shutdown的定义在触发报错的语句后面，因此将其移动到前面
2. 在_init_thread时也可能会失败，因此根据实际的_worker_status数量进行销毁，否则会触发list的 out of range报错

[paddle-bot]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 6 lines in your changes missing coverage. Please review.

Please upload report for BASE (develop@673924e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
python/paddle/io/dataloader/dataloader_iter.py	50.00%	6 Missing ⚠️

❌ Your patch status has failed because the patch coverage (50.00%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@ Coverage Diff @@ ## develop #73931 +/- ## ========================================== Coverage ? 50.00% ========================================== Files ? 1 Lines ? 12 Branches ? 0 ========================================== Hits ? 6 Misses ? 6 Partials ? 0 

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[SigureMo]

LGTMeow