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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Use GitHub Actions concurrency to keep matching scheduled workflow runs—or a specific job—from operating on the same resource at the same time. Choose a group key that identifies the resource and the runs that should coordinate, then decide whether newer work should replace, cancel, or wait behind existing work. Concurrency controls overlap; it does not guarantee that every scheduled trigger runs on time or at all.
Choose what needs to run exclusively
GitHub Actions permits concurrent runs by default. A concurrency group limits matching runs or jobs to one active member at a time. Configure it at the broadest scope that actually shares state or causes side effects, rather than serializing unrelated work.
Serialize the whole workflow
Put concurrency at the top level when no two runs of the workflow should overlap—for example, when each run updates the same deployment target or shared data. This can hold the entire run behind another member of the group.
Serialize only a critical job
Put concurrency on the job that needs exclusive access when other jobs can safely proceed in parallel. Only that job is coordinated; the rest of the workflow is not automatically serialized. See GitHub’s concurrency documentation.
#1 Best Overall
- ✓ BLUE BACKLIGHT & 18 ON/OFF PROGRAMS: BN-LINK digital timer switch features a blue backlight, ensuring easy visibility and programming. Set up to 18 On/Off programs and 7-day scheduling options, you have the flexibility to tailor your lighting. Whether it's for lights, fans, you can set intervals as short as one minute and choose individual days or preset combination days, providing unparalleled customization and convenience.
- ✓ FULL CONTROL & BACKUP BATTERY: Take charge of your home lighting effortlessly with the BN-LINK 7-Day Programmable Light Switch Timer. DST Mode makes seasonal time adjustments quick and easy with one-touch control, eliminating the need to reset your schedules.Easily shift between AUTO (timed on/off) and MANUAL (manual on/off) modes by pressing and holding on the door. Plus, enjoy peace of mind with its built-in rechargeable battery, ensuring your settings remain intact during power outages.
- ✓ PROTECT HOME & SAVE ENERGY: Activate automatic timer light switch's "Random" vacation mode to create the illusion of occupancy and deter potential intruders while you're away. Scheduled programming allows this wall timer switches to automatically turn lights on/off according to your schedule, perfect for managing porch lights, entryway lights, hallway lights, garage lights, patio lights, ceiling fans, and more while saving time, energy, and daily effort.
- ✓ SINGLE-POLE & 3-WAY COMPATIBLE: Designed for both single-pole and 3-way setups, This light switch timer indoor gives you flexible installation options for different home wiring needs. BN-LINK 3 way timer switch for lights lets you control the same light from two locations, ideal for stairways, hallways, garages, large rooms, and entryways. Compatible with SPDT switches. Wall plate included.
- ✓ NEUTRAL WIRE REQUIRED：Neutral Wire Must Required When Installation.This digital light timer switch is ETL listed and rigorously controlled for quality and safety. Conforms to UL Std.60730-1, 60730-2-7. Rating: 15A/1875W, 10A/1250W Tungsten, 10A/1250W Ballast, 1/2HP, 125VAC, 60Hz. Operating temp.: -15°C (5°F) to 50°C (122°F). Storage temp.: -20°C (-4°F) to 60°C (140°F).
Pick a group key that matches the shared resource
A common workflow-per-branch key is ${{ github.workflow }}-${{ github.ref }}. It coordinates runs of the same workflow on the same ref while leaving other workflows and refs independent. Use a shared, stable key instead when different workflows or branches really do operate on the same external resource.
Group names are case-insensitive. Workflows using the same group can affect one another’s pending or active work, so do not reuse a group accidentally. Conversely, including workflow and branch identity when they must be independent prevents unintended cross-workflow or cross-ref coordination. The key should represent the boundary at which simultaneous access is unsafe, not merely be copied from a template. Details and expression context are in GitHub’s concurrency documentation.
Rank #2
- SunSmart technology – Built-in function adjusts sunrise and sunset settings throughout the year to accommodate varying daylight times for your region
- Weekly programming – Create up to seven ON/OFF programs throughout the week to support varied schedules, and a random security feature alters settings by up to 30 minutes to create a lived-in appearance
- Switch upgrade – Replace single-pole or three-way switches equipped with a neutral wire to control LED, CFL, incandescent and halogen bulbs, and other permanently installed fixtures
- Daylight saving time – Optional setting accommodates clock changes in areas that observe daylight saving time without reprogramming your light timer
Configure a scheduled workflow
This example serializes the whole workflow for each branch ref and allows an active run to finish when a newer run arrives:
on:
schedule:
- cron: '17 * * * *'
concurrency:
group: ${{ github.workflow }}-${{ github.ref }}
cancel-in-progress: false
jobs:
scheduled-task:
runs-on: ubuntu-latest
steps:
- run: ./run-task.shThe offset cron minute avoids scheduling at the top of the hour, a period GitHub identifies as especially prone to schedule delay under high load. It reduces exposure to that hotspot but cannot guarantee punctual delivery. If the task instead needs exclusivity only during one step of a larger workflow, place the concurrency block on that job.
The Tool Desk
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- ✓ VERSATILE & CUSTOMIZABLE: BN-LINK digital timer switch sets up to 18 On/Off programs and 7-day scheduling options, you have the flexibility to tailor your lighting. Whether it's for lights, fans, you can set intervals as short as one minute and choose individual days or preset combination days, providing unparalleled customization and convenience.
- ✓ FULL CONTROL & BACKUP BATTERY: Take charge of your home lighting effortlessly with the BN-LINK 7-Day Programmable Light Switch Timer. DST Mode makes seasonal time adjustments quick and easy with one-touch control, eliminating the need to reset your schedules.Easily shift between AUTO (timed on/off) and MANUAL (manual on/off) modes by pressing and holding on the door. Plus, enjoy peace of mind with its built-in rechargeable battery, ensuring your settings remain intact during power outages.
- ✓ PROTECT HOME & SAVE ENERGY: Activate automatic timer light switch's "Random" vacation mode to create the illusion of occupancy and deter potential intruders while you're away. Scheduled programming allows this wall timer switches to automatically turn lights on/off according to your schedule, perfect for managing porch lights, entryway lights, hallway lights, garage lights, patio lights, ceiling fans, and more while saving time, energy, and daily effort.
- ✓ SINGLE-POLE & 3-WAY COMPATIBLE: Designed for both single-pole and 3-way setups, This light switch timer indoor gives you flexible installation options for different home wiring needs. BN-LINK 3 way timer switch for lights lets you control the same light from two locations, ideal for stairways, hallways, garages, large rooms, and entryways. Compatible with SPDT switches. Wall plate included.
- ✓ NEUTRAL WIRE REQUIRED：Compatible with SPDT and Neutral Wire Must Required When Installation.This digital light timer switch is ETL listed and rigorously controlled for quality and safety. Conforms to UL Std.60730-1, 60730-2-7. Rating: 15A/1875W, 10A/1250W Tungsten, 10A/1250W Ballast, 1/2HP, 125VAC, 60Hz.
Choose what happens when another run arrives
There are two separate decisions: whether the current active run should finish, and whether older waiting work should be retained. GitHub’s available behaviors differ as follows:
| Configuration | Active run | Pending work | Use it when |
|---|---|---|---|
Default behavior (cancel-in-progress omitted or false; no queue) |
One run remains active. | At most one run is pending; a newer queued run replaces the older pending run. | Intermediate pending executions are disposable and the newest waiting work is the useful one. |
cancel-in-progress: true |
An active run is canceled when newer matching work arrives. | The newer work can proceed after cancellation; without a queue policy, the pending-run replacement behavior still applies. | Active work becomes obsolete as soon as a newer run exists, and interruption is safe. |
queue: max |
The active run is allowed to proceed. | Up to 100 waiting jobs or workflow runs are retained for the group instead of replacing a pending run. | Every run should wait its turn rather than dropping intermediate work. |
With queue: max, GitHub documents a maximum of 100 waiting jobs or workflow runs per group. It cannot be combined with cancel-in-progress: true. Queue ordering is based on when work began waiting, and actual start times can vary; do not treat it as a promise of dispatch-time ordering. See GitHub’s concurrency documentation.
Rank #4
- Country of Origin: CHINA
- The Package Length of the product is 6.6 inches
- The Package Width of the product is 7.87 inches
- The Package Height of the product is 12.19 inches
Understand what concurrency does not guarantee
Concurrency prevents simultaneous execution among matching work that reaches the group. It is not an exactly-once or on-time delivery mechanism for cron triggers. GitHub says the schedule event can be delayed during periods of high Actions load, particularly at the beginning of an hour; at sufficiently high load, queued jobs can also be dropped. GitHub advises choosing a different minute of the hour to reduce the likelihood of delay. See GitHub’s schedule-event documentation.
Quick Recap
Best Value
- Save time, money and energy by scheduling your indoor or outdoor lighting and appliances - ideal for ceiling lights, ceiling fans, exhaust fans, patio lights, and more.
- Features 4 programmable On/Off buttons and 2 On/Off override buttons for when you need to use the connected light/fan outside of your selected scheduled times.
- Blue LED indicator lights next to each button show which buttons/programs are currently active or selected. Compatible with LED, CFL, Incandescent and Halogen bulbs as well as dimmable LED and dimmable CFL bulbs.
- Replace your existing light switch - (NEUTRAL WIRE IS REQUIRED – WALL PLATE NOT INCLUDED) Screw terminal installation provides improved space efficiency when replacing existing switches compared to flying leads
- Backup battery maintains your settings in the event of a power outage. Electrical Ratings: 120VAC 60 Hz, 15A General/Resistive, 1200W Tungsten, 1200VA Ballast, ½ HP, UL Listed.
Check schedule behavior when runs are late or missing
- Confirm the workflow is on the default branch. Scheduled workflows run using the latest commit on the default branch, and the workflow file must exist on that branch. A schedule does not run a version selected from another branch. GitHub documents this behavior.
- Check the timezone and cron cadence. Schedules default to UTC, support an IANA timezone, and have a shortest interval of once every five minutes. Make sure the expression is interpreted in the intended timezone. See the schedule-event reference.
- Check repository activity for public repositories. GitHub automatically disables scheduled workflows in public repositories after 60 days without repository activity. This can explain an absent run even when the cron expression and concurrency group are unchanged. See GitHub’s schedule-event documentation.
- Distinguish a delayed or dropped trigger from serialization. A run waiting behind another member of its group is a concurrency outcome; a schedule delayed or dropped under platform load is a trigger-delivery issue. Changing the group policy cannot recover a trigger that was never delivered.
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