Zygo Blaxell 0580c10082 main: add support for pause (SIGUSR1) and resume (SIGUSR2) ...

These are simple on/off switches for the task queue.  They are lightweight
requests for bees to be paused temporarily, but allow bees to release
open files and save progress while paused.

These signals are an alternative to SIGSTOP and SIGCONT, or using the
cgroup freezer's FROZEN and THAWED states, which pause and resume the
bees process, but do not allow the bees process to release open files
or save progress.  Snapshot and file deletes can occur on the filesystem
while bees is paused by SIGUSR1 but not by SIGSTOP.

These signals are also an alternative to SIGTERM and restart, which
flush out the whole hash table and progress state on exit, and read
the whole table back into memory on restart.

This feature is experimental and may be replaced by a more general
configuration or runtime control mechanism in the future.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

2024-12-12 23:01:19 -05:00

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