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Make sentinel value configurable in library/std/src/sys_common/thread_local_key.rs #105359

Merged
merged 1 commit into from
Dec 29, 2022
Merged

Make sentinel value configurable in library/std/src/sys_common/thread_local_key.rs #105359

merged 1 commit into from
Dec 29, 2022

Commits on Dec 6, 2022

  1. Make sentinel value configurable 

    There are OSs that always return the lowest free value.
The algorithm in `lazy_init` always avoids keys with the
sentinel value.
In affected OSs, this means that each call to `lazy_init`
will always request two keys from the OS and returns/frees
the first one (with sentinel value) immediately afterwards.

By making the sentinel value configurable, affected OSs can
use a different value than zero to prevent this performance
issue.
    @flba-eb
    flba-eb committed Dec 6, 2022
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