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README.md

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CuRT : Compat Unicellular Real-Time operating system.

Features

  • Preemptive Multi-threading
  • Priority-base Round-Robin Scheduling
  • Thread Management
  • Semaphore Management Support
  • IPC: mailbox, message queue

Licensing

Revised BSD License. Please check the file LICENSE.txt for details.

Supported Hardware

  • Marvell/Intel Xscale PXA25x platforms
  • Emulated ARM PXA environment by QEMU

Building and Testing

  • ARM Toolchain from CodeSourcery: Sourcery G++ 2008q1 http://www.codesourcery.com/gnu_toolchains/sgpp
  • Download "arm-linux" toolchain and set up the required path.
  • Prepare QEMU as ARM system emulator (version >= 0.9.1)
  • Perform the following commands to build CuRT and sample application $ make && cd app/shell
  • Install built CuRT image into NAND flash: $ ./prepare-flash
  • Launch CuRT via QEMU: $ ./run-connex
  • Type "help" to get information from shell $ help

Internals

  • Thread state:

    • RUNNING
    • READY
    • EVENT_WAIT
    • BLOCK
    • DELAY
    • TERMINATE

  • Scheduling policy The scheduler is called in the following two cases:

    • SCHED_TIME_EXPIRE : when thread's time_quantum value is 0.
    • SCHED_THREAD_REQUEST : Request the execution for higher priority thread.

defined in prio_exist_flag

	----------------------------------------------------------------
	|0|1|0|0|0|0|0|0|0|0|1|0|0|0|0|0|0|0|0|0|1|0|0|0|0|0|0|0|0|0|0|1|
	----------------------------------------------------------------
  		|                 |                   |                     |
  		|                 |                   |                     |
	ready_list[1]     ready_list[11]    ready_list[21]         ready_list[31]
                                                                    |
                                                                Idle thread