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<div class="">On Oct 3, 2022, at 4:34 AM, Maxim Kartashev <<a href="mailto:mkartashev@openjdk.org" class="">mkartashev@openjdk.org</a>> wrote:</div>
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<div class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">On
Mon, 3 Oct 2022 10:35:44 GMT, Alan Bateman <</span><a href="mailto:alanb@openjdk.org" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">alanb@openjdk.org</a><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">>
wrote:</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
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<blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
The suggestion was to explore doing this at a low level with kqueue so that we don't have callbacks.<br class="">
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<span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Vladimir
Kempik had a draft implementation based on kqueue that, AFAIR, passed all the existing tests; he may be interested in getting his work merged into the mainline.</span></div>
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<div class="">As I mentioned, I wrote a prototype based on kqueue and it also (usually) passed all the tests but had problems shutting down. It also sometimes ran out of file descriptors. Unless my testing was wrong, I think that using kqueue here is likely
to run into the exhausted file descriptor situation frequently if the `ENTRY_MODIFY` event is watched. `ENTRY_CREATE` and `ENTRY_DELETE` could be detected by watching the directory file descriptor alone and rescanning the directory, but modifying a contained
file alone will not generate any event on the directory descriptor, hence watching for `ENTRY_MODIFY` requires an open descriptor for each file in the directory.</div>
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