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Document restriction on 32-bits and 64-bits datatypes.

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This commit is contained in:
Ed Schouten 2011-12-27 22:14:35 +00:00
parent 6d57c75097
commit 669ab20feb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=228920
1 changed files with 6 additions and 0 deletions
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6
share/man/man3/ATOMIC_VAR_INIT.3
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@ -281,6 +281,12 @@ This behaviour cannot be emulated for older compilers.
To prevent unintended non-atomic access to these variables, this header
file places the atomic variable in a structure when using an older
compiler.
.Pp
When using GCC on architectures on which it lacks support for built-in
atomic intrinsics, these macros may emit function calls to fallback
routines.
These fallback routines are only implemented for 32-bits and 64-bits
datatypes, if supported by the CPU.
.Sh SEE ALSO
.Xr pthread 3 ,
.Xr atomic 9