Atomic compare_and_swap function

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originally posted by kwokwong@Nov 2 2006, 10:14 PM

hi all,

according the header file (d:\altera5\kits\nios2_50\bin\eclipse\plugins\com.microtronix.nios2linux.uclibc_1.4.0\include\bits\atomicity.h),

the implemented function is only stub (not really atomic!).

does anyone know how to do it really atomic?

i thought that the simplest way is to disable the interrupt when doing this function and re-enable the interrupt afterwards.

so i need to know how to enable/disable interrupt ??

regards,

kwok wong

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It is not implemented, so we need a nios2 version in,

uClibc/libc/sysdeps/linux/nios2/bits/atomicity.h

Look at other arch, eg, arm,m68k,mips,i386, they use locked exchange instead of disable interrupt.

Are there locked instructions in Nios2?