jerpelea opened a new pull request, #21250: URL: https://github.com/apache/nuttx/pull/21250
## Summary nxsig_queue_action() runs the signal handler at once when the signal is for the calling thread. It is called from nxsig_tcbdispatch(), which holds the critical section. In a kernel build this happens at the end of each system call with a pending signal: the user handler then runs in user mode with interrupts disabled, and on SMP its thread holds the global critical section lock until the handler returns. The other CPUs wait for the lock all that time, and the CPU of the handler takes no interrupt. Let nxsig_queue_action() only mark the delivery, and deliver in nxsig_tcbdispatch() after it leaves the critical section. A signal that an interrupt queues meanwhile is delivered in the same loop. ## Impact RELEASE ## Testing CI -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
