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authorEric Wong <e@yhbt.net>2020-06-27 10:03:59 +0000
committerEric Wong <e@yhbt.net>2020-06-28 22:29:39 +0000
commit35e31227139e401cf7845d824a1b4e6a1de56fe3 (patch)
tree78bc53a4e5cfe47486e6a7882a078e73836dc051 /lib/PublicInbox/WatchMaildir.pm
parent6968c91707d51f6a60d476cc2f5d65a660146813 (diff)
downloadpublic-inbox-35e31227139e401cf7845d824a1b4e6a1de56fe3.tar.gz
SQLite only issues non-blocking F_SETLK ops (not F_SETLKW) and
retries failures using a configurable busy_timeout.  SQLite's
busy loop sleeps for a millisecond and retries the lock until
the configured busy_timeout is hit.

Trying to set ->sqlite_busy_timeout to larger values (e.g. 30000
milliseconds) still leads to failure when running the new stress
test with 8 processes with TMPDIR on a 7200 RPM HDD.

Inspection of SQLite source reveals there's no built-in way to
use F_SETLKW, so tack on the existing flock(2) support we use to
synchronize git + SQLite + Xapian for inbox writing.  We use
flock(2) instead of POSIX fcntl(2) locks since Perl doesn't
provide a way to manipulate "struct flock" portably.
Diffstat (limited to 'lib/PublicInbox/WatchMaildir.pm')
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