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| author | Steve Baird <baird@adacore.com> | 2022-08-25 14:56:55 -0700 |
|---|---|---|
| committer | Marc Poulhiès <poulhies@adacore.com> | 2022-09-12 10:16:50 +0200 |
| commit | 4a46f59cb360013e11591a1e0d4cdc09f4b7dee1 (patch) | |
| tree | 61cdc0621ee774861853706fb397e7aafedfe103 /gcc/ada/doc | |
| parent | de01e1b86a1095459883d15224aa195e6a3c71ff (diff) | |
| download | gcc-4a46f59cb360013e11591a1e0d4cdc09f4b7dee1.zip gcc-4a46f59cb360013e11591a1e0d4cdc09f4b7dee1.tar.gz gcc-4a46f59cb360013e11591a1e0d4cdc09f4b7dee1.tar.bz2 | |
[Ada] Lock_Free aspect takes precedence over Ceiling_Locking locking policy
Allow the Lock_Free aspect of a protected type to be True (but only by
explicit specification) if Ceiling_Locking locking policy has been specified.
Clarify that the Lock_Free aspect takes precedence over the Ceiling_Locking
policy in that case.
gcc/ada/
* sem_ch9.adb
(Satisfies_Lock_Free_Requirements): If Ceiling_Locking locking
policy has been specified, then either return False (if Lock_Free
was not explicitly specified) or generate a warning that ceiling
locking will not be implemented for this protected unit (if
Lock_Free was explicitly specified). Generate an error message (in
addition to returning False) if an explicit Lock_Free aspect
specification is rejected because atomic primitives are not
supported on the given target.
* doc/gnat_rm/implementation_defined_pragmas.rst: Clarify that the
Lock_Free aspect for a protected unit takes precedence over the
Ceiling_Locking locking policy in the case where both apply.
* gnat_rm.texi: Regenerate.
Diffstat (limited to 'gcc/ada/doc')
| -rw-r--r-- | gcc/ada/doc/gnat_rm/implementation_defined_pragmas.rst | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gcc/ada/doc/gnat_rm/implementation_defined_pragmas.rst b/gcc/ada/doc/gnat_rm/implementation_defined_pragmas.rst index 623949e..1d3a99d 100644 --- a/gcc/ada/doc/gnat_rm/implementation_defined_pragmas.rst +++ b/gcc/ada/doc/gnat_rm/implementation_defined_pragmas.rst @@ -3752,7 +3752,12 @@ In addition, each protected subprogram body must satisfy: * May not dereferenced access values * Function calls and attribute references must be static - +If the Lock_Free aspect is specified to be True for a protected unit +and the Ceiling_Locking locking policy is in effect, then the run-time +actions associated with the Ceiling_Locking locking policy (described in +Ada RM D.3) are not performed when a protected operation of the protected +unit is executed. + Pragma Loop_Invariant ===================== |