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| author | ed <ed@FreeBSD.org> | 2011-12-27 22:14:35 +0000 |
|---|---|---|
| committer | ed <ed@FreeBSD.org> | 2011-12-27 22:14:35 +0000 |
| commit | 88405d6b4db506be77862821665c43143a4c5c4b (patch) | |
| tree | cac44cbba13806303a83cc77de43603d3663bf38 /share/man/man3 | |
| parent | 52306b41a65349c9fb64a1e03d2b593af6927dbd (diff) | |
| download | FreeBSD-src-88405d6b4db506be77862821665c43143a4c5c4b.zip FreeBSD-src-88405d6b4db506be77862821665c43143a4c5c4b.tar.gz | |
Document restriction on 32-bits and 64-bits datatypes.
Diffstat (limited to 'share/man/man3')
| -rw-r--r-- | share/man/man3/ATOMIC_VAR_INIT.3 | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/share/man/man3/ATOMIC_VAR_INIT.3 b/share/man/man3/ATOMIC_VAR_INIT.3 index 6f20b84..41f28db 100644 --- a/share/man/man3/ATOMIC_VAR_INIT.3 +++ b/share/man/man3/ATOMIC_VAR_INIT.3 @@ -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 |
