1. 09 Apr, 2019 1 commit
    • alex@thinkpad's avatar
      QEMU logging: updated DryOS and VxWorks task switch handling · 9049426c8cce
      alex@thinkpad authored
      It was quite hard to pass the test suite, as there were lots of edge cases:
      
      - context switch may happen either in a timer interrupt, or in a regular task (e.g. msleep, sempahores and so on)
      - context switch is not atomic - it happens a few instructions (or function calls!) afterh updating the current task pointer
      - until the registers are swapped for the new task, we are still on the stack of the previous task
      - there may be dummy task switches (i.e. from one task to the same task)
      - an interrupt can occur in the middle of a (non-atomic) context switch (!)
      - VxWorks models do not even use a unique task ID (!)
      
      Result: QEMU no longer crashes during logging tests!
      
      Issue: these cameras do not appear to use an unique task ID. Workaround: assign our own task IDs.
      
      --HG--
      branch : qemu
      9049426c8cce
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