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Avoid extra mutex contention#189

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mperham merged 3 commits intomperham:mainfrom
albus522:avoid-extra-mutex-contention
Aug 8, 2024
Merged

Avoid extra mutex contention#189
mperham merged 3 commits intomperham:mainfrom
albus522:avoid-extra-mutex-contention

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@albus522 albus522 commented Aug 8, 2024

NOTE: This includes the commit from #188 so I didn't have to deal with wonky rebasing.

This limits the mutex lock to interactions with the stack that are small, fast, and atomic. Moving the connection close code outside the mutex as it doesn't impact the pool.

Sidenote: Thinking about releasing the reap update, it probably needs to be a major version bump as it breaks things for anyone that has used the defined extension points and interacts with @que. It is probably possible this could be modified to only introduce a breaking change if reap is used.

After max queue size connections have been reaped, no new connections are allowed to be created.
The connection shutdown block can safely happen outside the mutex. This allows another thread to safely grab a connection while the reaper is still working through old connections.
@mperham mperham merged commit 7d48bcb into mperham:main Aug 8, 2024
alexf101 pushed a commit to StileEducation/connection_pool that referenced this pull request Apr 10, 2025
* Fix reaper exhausting the queue

After max queue size connections have been reaped, no new connections are allowed to be created.

* Reduce contention on the stack mutex

The connection shutdown block can safely happen outside the mutex. This allows another thread to safely grab a connection while the reaper is still working through old connections.

* Handle stack shutdown in reap
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