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Linux ARM 5/16
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Authored by soutade_gmail.com on Jun 8 2016, 2:46 PM.

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Linux ARM : Add linux_support.s that contains futex implementation

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rS FreeBSD src repository - subversion
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soutade_gmail.com retitled this revision from to Linux ARM 5/16.
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It looks like these should all be atomic operations. If so the flow should be:

1: ldrex old, [addr]
   operation
   strex res, new, [addr]
   cmp res, #0
   bne 1b

It looks like these should all be atomic operations. If so the flow should be:

1: ldrex old, [addr]
   operation
   strex res, new, [addr]
   cmp res, #0
   bne 1b

Don't understand what is exactly the problem you point to.

sys/arm/linux/linux_support.s
83

There is a ldrex here, but no strex. These should be in pairs with the needed operation between the two. See sys/arm/include/atomic-v6.h as an example.

Rework all functions with right use of ldrex and strex