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Mainly around fork() calls, but some nearby places as well.
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Using "make update-copyrights" after setting GNULIB_PATH in my
config.mak
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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.
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Respect XDG_DATA_HOME to avoid cluttering ~/.public-inbox/.
Existing users of ~/.public-inbox/imap.sqlite3 will remain
supported, but the preference for new data is to use
~/.local/share and other paths standardized by XDG.
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
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