[GitHub] [incubator-nuttx] xiaoxiang781216 edited a comment on pull request #1009: Add support for preemptive scheduling in simulator build

[GitBox <gi...@apache.org>]

xiaoxiang781216 edited a comment on pull request #1009:
URL: https://github.com/apache/incubator-nuttx/pull/1009#issuecomment-647422156


   SP modification need adjust for each host, @sebastianene07 can reference state-thread which implement user mode thread by setjmp/longjmp:
   https://github.com/ossrs/state-threads/blob/srs/md.h#L317
   But there is a portable way to modify PC like this:
   ```
   void up_initial_state(struct tcb_s *tcb)
   {
     if (setjmp((&tcb->xcp))
       {
          tcb->start();
       }
     else
       {
          tcb->xcp.regs[JB_SP] = (xcpt_reg_t)tcb->adj_stack_ptr - sizeof(xcpt_reg_t);
       }
   }
   ```


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