Signal Fixes

[rickard-green]

Three signal handling fixes:

• OTP-18647 - A process optimized for parallel signal delivery could under some circumstances lose wakeup information. That is, the processes was not woken up to take care of the signal, so the signal would not be taken care of until the process was woken by another signal. Only processes configured with message_queue_data set to off_heap utilize this optimization.
• OTP-18706 - Delivery time of message signals to a process not executing any receive expressions could become very long, potentially infinite. For example, a process checking for messages using process_info(self(), message_queue_len) or process_info(self(), messages) and avoiding to execute a receive expression matching on messages could be very slow in detecting new messages. Note that you are still discouraged from using process_info() this way. A process that wants to check if there are messages available to handle should execute a receive expression matching on messages.
• OTP-18737 - A constant flow of incoming non-message signals could prevent a process needing to execute dirty from doing so.

[github-actions]

CT Test Results

       4 files     194 suites   1h 47m 1s ⏱️
2 942 tests 2 647 ✔️ 295 💤 0 ❌
3 649 runs  3 285 ✔️ 364 💤 0 ❌

Results for commit 97f1928.

♻️ This comment has been updated with latest results.