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sim/README.txt: Update the SMP related section

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Xiang Xiao 2020-02-09 19:18:40 +08:00 committed by Gregory Nutt
parent 406a9adfdd
commit a129389fe1
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boards/sim/sim/sim/README.txt
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@ -288,6 +288,9 @@ SMP
result is undefined: result is undefined:
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1318.htm http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1318.htm
Update: The dead lock is due to up_testset call pthread API for synchronization
inside the signal handler. After swiching to atomic API, the problem get resolved.
You can enable SMP for ostest configuration by enabling: You can enable SMP for ostest configuration by enabling:
+CONFIG_SPINLOCK=y +CONFIG_SPINLOCK=y
@ -322,6 +325,19 @@ SMP
often simuart_post() will be called from CPU1 and it will try to restart NSH often simuart_post() will be called from CPU1 and it will try to restart NSH
on CPU0 and, again, the same quirkiness occurs. on CPU0 and, again, the same quirkiness occurs.
Update: Only CPU0 call up_idle now, other CPUs have a simple idle loop:
/* The idle Loop */
for (; ; )
{
/* Give other pthreads/CPUs a shot */
pthread_yield();
}
So it isn't a problem any more.
But for example, this command: But for example, this command:
nsh> sleep 1 & nsh> sleep 1 &