Fix Build::compile_objects deadlock on parallel
#829
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`jobserver::Client::acquire` may block if there's not enough token. To avoid blocking, this patch waits for child in a separate thread so that once the old compiler job is done, it may continue spawning new job instead of blocking forever. Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>
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P.S. This could be much easier if stdlib provides a simple async runtime. |
thomcc
approved these changes
Jul 20, 2023
Thanks for the review, with this change it still spawns less threads than before, where two threads are spawned for every object. |
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jobserver::Client::acquiremay block if there's not enough token.To avoid blocking, this patch waits for child in a separate thread so that once the old compiler job is done, it may continue spawning new job instead of blocking forever.
This PR also makes sure that the released token is always re-acquired.