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I am developing an embedded application in LM3S6965 evaluation board using Keil C compiler. Is there any option for creating multithreaded embedded application?
Multi-threading is not an intrinsic part of C, so is not provided by the compiler at all, but rather by libraries. In that respect, multi-threading can be implemented using any C compiler; it is more a case of choosing (or writing) a suitable library.
Many RTOS kernels exist for ARM Cortex-M, but the the Keil MDK-ARM includes the RTX real-time OS library which supports multi-threading.
The uVision IDE explicitly has an option to include the RTX library, and the debugger has a rudimentary level of kernel awareness. RTX itself is fairly primitive, but suited to small projects, and all of Keil’s other middle-ware such as TCP/IP, USB, CAN and filesystem work with it directly.