Use thread-safe getenv wrapper

[cyyever]

Fixes #ISSUE_NUMBER

cc @mrshenli @pritamdamania87 @zhaojuanmao @satgera @rohan-varma @gqchen @aazzolini @osalpekar @jiayisuse @H-Huang @kwen2501 @awgu @penguinwu @fegin @XilunWu @wanchaol @fduwjj @wz337 @tianyu-l @wconstab @yf225 @chauhang @d4l3k

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/124478

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❌ 1 New Failure

As of commit 24c516d with merge base a56e057 ():

NEW FAILURE - The following job has failed:

• pull / linux-focal-py3.11-clang10 / test (default, 3, 3, linux.2xlarge) (gh)
  RuntimeError: profiler/test_profiler 1/1 failed

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[wconstab]

ping @shuqiangzhang when you're ready for a review on this

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