[BACKPORT #2298] sched: Fix nx_waitid(), nx_waitpid(), nxtask_exithook() for SMP #2306
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@masayuki2009 @btashton This had a little conflict in nxtask_exithook. Please take a look. |
btashton
approved these changes
Nov 15, 2020
Summary: - I noticed waitpid_test stops with lc823450-xgevk:rndis - The condition was CONFIG_DEBUG_ASSERTION=y - Actually, the child task sent SIGCHILD but the parent couldn't catch the signal - Then, I found that nx_waitid(), nx_waitpid() use sched_lock() - However, a parent task and a child task are running on different CPUs - So, sched_lock() is not enough and need to use a critical section - Also, signal handling in nxtask_exithook() must be done in a critical section Impact: - SMP only Testing: - Tested with ostest with the following configurations - lc823450-xgevk:rndis (CONFIG_DEBUG_ASSERTION=y and n) - spresense:smp - spresense:wifi_smp (NCPUS=2 and 4) - sabre-6quad:smp (QEMU) - esp32-core:smp (QEMU) - maix-bit:smp (QEMU) - sim:smp Signed-off-by: Masayuki Ishikawa <[email protected]>
Yes. |
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Summary
Backports #2298