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libPQ -Canceling Blocking Calls
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* libPQ -Canceling Blocking Calls
@ 2008-07-10 20:09  Keary Suska <hierophant@pcisys.net>
  0 siblings, 1 reply; 3+ messages in thread

From: Keary Suska @ 2008-07-10 20:09 UTC (permalink / raw)
  To: pgsql-interfaces

Is it possible to use PQcancel() to cancel a blocking call, such as a call
to PQexec?

TIA,

Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"





^ permalink  raw  reply  [nested|flat] 3+ messages in thread

* Re: libPQ -Canceling Blocking Calls
@ 2008-07-10 21:05  Tom Lane <tgl@sss.pgh.pa.us>
  parent: Keary Suska <hierophant@pcisys.net>
  0 siblings, 1 reply; 3+ messages in thread

From: Tom Lane @ 2008-07-10 21:05 UTC (permalink / raw)
  To: Keary Suska <hierophant@pcisys.net>; +Cc: pgsql-interfaces

Keary Suska <hierophant@pcisys.net> writes:
> Is it possible to use PQcancel() to cancel a blocking call, such as a call
> to PQexec?

Sure.  Look at psql for an example.  You probably need to call PQcancel
from a signal handler, but there's a signal-safe variant for that.

			regards, tom lane



^ permalink  raw  reply  [nested|flat] 3+ messages in thread

* Re: libPQ -Canceling Blocking Calls
@ 2008-07-10 22:51  Keary Suska <hierophant@pcisys.net>
  parent: Tom Lane <tgl@sss.pgh.pa.us>
  0 siblings, 0 replies; 3+ messages in thread

From: Keary Suska @ 2008-07-10 22:51 UTC (permalink / raw)
  To: pgsql-interfaces

7/10/08 3:05 PM, also sprach tgl@sss.pgh.pa.us:

> Sure.  Look at psql for an example.  You probably need to call PQcancel
> from a signal handler, but there's a signal-safe variant for that.

Great. Although I was planning on using a threaded approach, but since libpq
was compiled thread-safe, I assume this would be fine. I was hoping I could
cancel a synchronous call without having to collapse the thread. This is
good news.

Thanks,

Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"





^ permalink  raw  reply  [nested|flat] 3+ messages in thread

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2008-07-10 20:09 libPQ -Canceling Blocking Calls Keary Suska <hierophant@pcisys.net>
2008-07-10 21:05 ` Tom Lane <tgl@sss.pgh.pa.us>
2008-07-10 22:51   ` Keary Suska <hierophant@pcisys.net>

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