[Xapian-tickets] [Xapian] #769: Provide more options for lock retrying

[Xapian]

#769: Provide more options for lock retrying
-------------------------+-------------------------
 Reporter:  bremner      |             Owner:  olly
     Type:  enhancement  |            Status:  new
 Priority:  normal       |         Milestone:
Component:  Other        |           Version:
 Severity:  normal       |        Resolution:
 Keywords:               |        Blocked By:
 Blocking:               |  Operating System:  All
-------------------------+-------------------------

Comment (by olly):

 The other problem with `timer_create()` is that it seems to have somewhat
 limited portability in practice - so far we've found that OpenBSD and GNU
 Hurd just have dummy implementations which always fail with `ENOSYS`, on
 AIX it always seems to fail with `EAGAIN`, and on NetBSD the calls appear
 to work but the timer doesn't actually seem to trigger after the timeout
 has passed.

 If we're using threads, we could perhaps launch one to perform the
 `fcntl()` call and a second which just does `sleep()` (or a finer
 granularity variant where supported) and then kills the first thread.

 A "sleeper thread" could probably also be used to implement the match
 timeout on platforms where `timer_create()` isn't usable (or maybe
 everywhere even).

--
Ticket URL: <https://trac.xapian.org/ticket/769#comment:2>
Xapian <https://xapian.org/>
Xapian