| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | Alexander Lakhin <exclusion(at)gmail(dot)com>, Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>, Noah Misch <noah(at)leadboat(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jacob Champion <jacob(dot)champion(at)enterprisedb(dot)com>, Denis Laxalde <denis(dot)laxalde(at)dalibo(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu>, "Gregory Stark (as CFM)" <stark(dot)cfm(at)gmail(dot)com>, Jelte Fennema <Jelte(dot)Fennema(at)microsoft(dot)com>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Peter Eisentraut <peter(at)eisentraut(dot)org>, Andres Freund <andres(at)anarazel(dot)de>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Etsuro Fujita <etsuro(dot)fujita(at)gmail(dot)com> |
| Subject: | Re: [EXTERNAL] Re: Add non-blocking version of PQcancel |
| Date: | 2024-07-17 00:05:23 |
| Message-ID: | CA+hUKG+RNLqeLug7mUwy2Ew21_oHMU+M65=Mi7Er7-nXsYwN0A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Jul 17, 2024 at 3:08 AM Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
> Ugh. I tried to follow what's going on in that cygwin code, but I gave
> up pretty quickly. It depends on a mutex, but I didn't see the mutex
> being defined or initialized anywhere.
Not obvious how it'd be deadlocking (?), though... it's hard to see
how anything between LOCK_EVENTS and UNLOCK_EVENTS could escape/return
early. (Something weird going on with signal handlers? I can't
imagine where one would call poll() though).
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