[GitHub] [nuttx] xiaoxiang781216 commented on issue #10642: Why nuttx didn't support atomic instruction?

["xiaoxiang781216 (via GitHub)" <gi...@apache.org>]

xiaoxiang781216 commented on issue #10642:
URL: https://github.com/apache/nuttx/issues/10642#issuecomment-1722215958

   atomic operation is defined since c11(https://en.cppreference.com/w/c/language/atomic), and the implementation is provided by toolchain already(e.g, libgcc.a from gcc). That's why you can't find the implementation from nuttx, an atmic test was added recently to help you check the atomic support with your toolchain:
   https://github.com/apache/nuttx-apps/tree/master/testing/atomic.
   For the old compiler, nuttx provide a simple implementation which ensure the atomic by disabling interrupt temporarily:
   https://github.com/apache/nuttx/blob/master/libs/libc/machine/arch_atomic.c
   Of cause, this implementation just works with one CPU case.
   
   


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