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RTOS/TMS320F28069: Why are there extra semaphore events shown in RTOS Analyzer Execution Graph?

Louis Zhu
Expert 1685 points

Part Number: TMS320F28069

Tool/software: TI-RTOS

I experiment TI-RTOS (SYS/BIOS v6.0.0.21, UIA v2.20.0.02) in CCS v7.4.

My application posts a semaphore from SWI, and ConvertTemp task pends on it. Why there are extra semaphore post and pend events shown in the circle? Please advise.

  • 0
    TI__Guru* 96960 points

    Hi Louis,

    Internally the kernel may be using a semaphore (or a gate that calls a semaphore) for thread safety reasons. For example, Memory_alloc (or malloc) will use a semaphore for mutual exclusion.

    You can correlate the execution graph with the Live Session view and see the handle of the Semaphore being used. Unfortunately the actual semaphore may not be in ROV->Semaphore since many of the internal semaphores are constructed (instead of created) and therefore not show up in ROV.

    Todd

  • 0 in reply to ToddMullanix
    Expert 1685 points
    Thanks for the explanation!