xiaoxiang781216 commented on issue #274: Improve sim timer URL: https://github.com/apache/incubator-nuttx/pull/274#issuecomment-586552455 > Some time back, i attempted to implement a timer for the simulation using a host timer on a timer pthread . I ran into the same problems as I did when I tried to implement simulated interrupts: https://cwiki.apache.org/confluence/display/NUTTX/NuttX+Simulation > This patch has a smaller scope: utilize the host timer to implement RTC get/set without arlarm support. So the pthread sync or signal handler isn't an issue here. > Basically, you cannot do a NuttX context switch from the context of a host signal handler or from host pthreads. I still have the host-based timer implementation and can send a tarball to anyone who is interested. It is from 2014 and so would need some minor environmental updates. In most case, the interrupt simulate through idle thread is same as through pthread/signal. Only two behaviour difference from my daily use: 1.The bad busy loop block all work in idle thread and then the simulator stop response 2.Simulated interrupt always happen inside idle thread which make the cpu loading generate the wrong report
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