Gergő Magyar 376ed3bb4a perf(lock): probe this process's own start time once (#3222) ... * perf(lock): probe this process's own start time once `acquireFileLock` stamps the owner file with the acquiring process's start time so a later reclaimer can tell a live owner from pid reuse. That value cannot change while we are running, but it was re-probed on every acquisition — and on Windows the probe is a `powershell.exe` spawn plus a `Get-CimInstance Win32_Process` WMI query, which is the single most expensive step in taking an uncontended lock. Add `readProcessStartTimeCached` and make it the default reader in `acquireFileLock` and `resolveWatchDeps`. Only this process's own pid is cached: - A foreign pid is always re-probed. That process can exit and its pid be reused, which is precisely what the stamp exists to detect. - A failed probe is not cached. `acquireFileLock` throws when the start time is empty, so caching one transient failure would leave the process unable to take a lock for the rest of its life. `readProcessStartTime` itself is unchanged and still probes every call, so the existing timezone-pinning regression test keeps exercising the real `ps` invocation instead of passing off a cached value. Behavior is otherwise identical: same probe, same string, same stamp. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * chore(autofix): apply prettier + eslint fixes via /autofix command --------- Co-authored-by: Gergo Magyar <gergomagyar0@gmail.com> Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>		2026-09-08 19:06:03 +01:00
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process-identity.ts	perf(lock): probe this process's own start time once (#3222)	2026-09-08 19:06:03 +01:00