npl/linux: Honor finite event queue timeouts - #2293
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The Linux queue currently treats every nonzero timeout as an indefinite condition wait. An empty queue therefore never returns when a caller requests a finite timeout. Use a CLOCK_MONOTONIC condition variable and a normalized absolute deadline for finite waits. Reuse the deadline after spurious wakeups and preserve nonblocking reads and BLE_NPL_TIME_FOREVER behavior. Add a watchdog-bounded regression covering empty-queue expiration, queued events, producer wakeups, and reuse after timeout. Register it in the Linux NPL test target.
sjanc
approved these changes
Sep 9, 2026
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The Linux queue currently treats every nonzero timeout as an indefinite condition wait. An empty queue therefore never returns when a caller requests a finite timeout.
Use a CLOCK_MONOTONIC condition variable and a normalized absolute deadline for finite waits. Reuse the deadline after spurious wakeups and preserve nonblocking reads and BLE_NPL_TIME_FOREVER behavior.
Add a watchdog-bounded regression covering empty-queue expiration, queued events, producer wakeups, and reuse after timeout. Register it in the Linux NPL test target.