Timer objects have a concept of slack. Slack defines how the system may alter the timer's deadline. Slack allows the system to internally coalesce timers and timer-like events to improve performance or efficiency.
Slack is made up of two components, type and amount. Type describes how slack can be applied:
- ZX_TIMER_SLACK_CENTER coalescing is allowed with earlier and later timers.
- ZX_TIMER_SLACK_EARLY coalescing is allowed only with earlier timers.
- ZX_TIMER_SLACK_LATE coalescing is allowed only with later timers.
Amount is the allowed deviation from the deadline. For example, a timer with ZX_TIMER_SLACK_EARLY and 5us may fire up to 5us before its deadline. A timer with ZX_TIMER_SLACK_CENTER and 7ms may fire anywhere from 7ms before its deadline to 7ms after its deadline.
Slack may also be applied to blocking syscalls that accept a deadline
Defaults and Job Policy
For Timer objects, slack is specified when creating and setting
timers. For other syscalls that take a deadline, but no slack
parameters, the slack type and amount are specified by the job's
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.