On 12/11/2025 10:24, Takashi Yano via Cygwin wrote:
On Tue, 21 Oct 2025 17:41:51 -0700
Nahor wrote:
...
I haven't been able to reproduce the missing data in the history file
so it's unknown if it's an issue in Fish or flock not locking properly
at times. So far the test passes on Linux and MacOS.
Thanks for the report.
Do you have any evidence that flock() should be MT-safe?
This issue seems to be caused by the fact that flock() in
cygwin is not MT-safe.
If flock is guarded by mutex in your test case, the issue
does not happen.
By definition, all standard APIs and certainly all synchronization
APIs on systems with threads support need to be thread safe to avoid
embarrassing failures.
Enjoy
Jakob
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