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Hang if subprocess spawns dependent subprocess #630

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harrisonliew opened this issue Jan 25, 2022 · 1 comment
Open

Hang if subprocess spawns dependent subprocess #630

harrisonliew opened this issue Jan 25, 2022 · 1 comment
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advanced PR bug low priority Easy workaround exists, regular QoL issue usability

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@harrisonliew
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harrisonliew commented Jan 25, 2022 •
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In this scenario, Hammer will hang:

  1. Hammer spawns a subprocess running a tool (e.g. a fill deck)
  2. The tool's script spawns some other process that waits for the tool to finish before running (e.g. merging fill with input database, like Hammer GDS merging #287)
  3. As a result, there is a bidirectional wait dependency and so the tool never exits.

It appears the subprocess module can't support this scenario? At the moment, these kinds of scripts need to be run outside of Hammer.
@harrisonliew harrisonliew added bug low priority Easy workaround exists, regular QoL issue usability advanced PR labels Jan 25, 2022
@harrisonliew harrisonliew mentioned this issue Jan 26, 2022
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@harrisonliew
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Possibly related: when VCS runs the compiled simulator, that output is not captured by the Hammer logs either.

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