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script: Bump poll timeout to 250ms

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The module has a poll timeout because it needs to periodically check if
it is shutting down. Otherwise, it would be stuck polling and the bar
couldn't shut down until the script produces a new line.

However, this causes the bar to wake up intermittently (currently
~40/s) due to the 25ms timeout.
Bumping this to 250ms still gives us timely shut downs and caps the
number of wake ups to 4/s.

This is only a stop-gap solution, ideally the script runner is
integrated into the main event loop and uses its polling handles which
don't have to wake up to check for a shutdown.

Ref #1778
Ref #2337
This commit is contained in:
patrick96 2022-12-12 00:15:04 +01:00 committed by Patrick Ziegler
parent d5498c8a8a
commit edf37385cb
2 changed files with 5 additions and 3 deletions
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4
CHANGELOG.md
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@ -35,7 +35,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- Added `enable-struts` option in bar section to enable/disable struts ([`#2769`](https://github.com/polybar/polybar/issues/2769), [`#2844`](https://github.com/polybar/polybar/pull/2844)) by [@VanillaViking](https://github.com/VanillaViking).
### Changed
- `custom/script`: No longer produces a completely empty module if the `exec` command failed. It only produces an empty module if the script had a zero exit code. ([`#2857`](https://github.com/polybar/polybar/discussions/2857), [`#2861`](https://github.com/polybar/polybar/pull/2861))
- `custom/script`:
- No longer produces a completely empty module if the `exec` command failed. It only produces an empty module if the script had a zero exit code. ([`#2857`](https://github.com/polybar/polybar/discussions/2857), [`#2861`](https://github.com/polybar/polybar/pull/2861))
- Bumped the script polling interval (not related to the `interval` setting) to decrease wakeups. Polybar may take slightly longer to shut down. [`#2879`](https://github.com/polybar/polybar/pull/2879)
- `internal/fs`: Use `/` as a fallback if no mountpoints are specified ([`#2572`](https://github.com/polybar/polybar/issues/2572), [`#2705`](https://github.com/polybar/polybar/pull/2705))
- `internal/backlight`:
- Detect backlight if none specified ([`#2572`](https://github.com/polybar/polybar/issues/2572), [`#2728`](https://github.com/polybar/polybar/pull/2728))

4
src/adapters/script_runner.cpp
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@ -109,7 +109,7 @@ script_runner::interval script_runner::run() {
* For non-tailed scripts, we only use the first line. However, to ensure interruptability when the module shuts
* down, we still need to continue polling.
*/
if (io_util::poll_read(fd, 25) && !got_output) {
if (io_util::poll_read(fd, 250) && !got_output) {
changed = set_output(cmd.readline());
got_output = true;
}
@ -155,7 +155,7 @@ script_runner::interval script_runner::run_tail() {
assert(fd != -1);
while (!m_stopping && cmd.is_running() && !io_util::poll(fd, POLLHUP, 0)) {
if (io_util::poll_read(fd, 25)) {
if (io_util::poll_read(fd, 250)) {
auto changed = set_output(cmd.readline());
if (changed) {