Kumar Kartikeya Dwivedi 4f07ddfa9b Introduce sd_notify_barrier
This adds the sd_notify_barrier function, to allow users to synchronize against
the reception of sd_notify(3) status messages. It acts as a synchronization
point, and a successful return gurantees that all previous messages have been
consumed by the manager. This can be used to eliminate race conditions where
the sending process exits too early for systemd to associate its PID to a
cgroup and attribute the status message to a unit correctly.

systemd-notify now uses this function for proper notification delivery and be
useful for NotifyAccess=all units again in user mode, or in cases where it
doesn't have a control process as parent.

Fixes: #2739
2020-05-01 03:22:47 +05:30
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2016-10-06 11:53:58 -04:00
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Systemd

System and Service Manager

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