diff options
Diffstat (limited to 'Include')
| -rw-r--r-- | Include/pyport.h | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/Include/pyport.h b/Include/pyport.h index fbaaa38..4faba7c 100644 --- a/Include/pyport.h +++ b/Include/pyport.h @@ -11,7 +11,7 @@ redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. /************************************************************************** Symbols and macros to supply platform-independent interfaces to basic -C-language operations whose spellings vary across platforms. +C language & library operations whose spellings vary across platforms. Please try to make documentation here as clear as possible: by definition, the stuff here is trying to illuminate C's darkest corners. @@ -22,6 +22,11 @@ SIGNED_RIGHT_SHIFT_ZERO_FILLS Meaning: To be defined iff i>>j does not extend the sign bit when i is a signed integral type and i < 0. Used in: Py_ARITHMETIC_RIGHT_SHIFT + +RETSIGTYPE +Meaning: Expands to void or int, depending on what the platform wants + signal handlers to return. Note that only void is ANSI! +Used in: Py_RETURN_FROM_SIGNAL_HANDLER **************************************************************************/ @@ -50,6 +55,25 @@ extern "C" { #define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) ((I) >> (J)) #endif +/* Py_FORCE_EXPANSION + * "Simply" returns its argument. However, macro expansions within the + * argument are evaluated. This unfortunate trickery is needed to get + * token-pasting to work as desired in some cases. + */ +#define Py_FORCE_EXPANSION(X) X + +/* Py_RETURN_FROM_SIGNAL_HANDLER + * The return from a signal handler varies depending on whether RETSIGTYPE + * is int or void. The macro Py_RETURN_FROM_SIGNAL_HANDLER(VALUE) expands + * to + * return VALUE + * if RETSIGTYPE is int, else to nothing if RETSIGTYPE is void. + */ +#define int_PySIGRETURN(VALUE) return VALUE +#define void_PySIGRETURN(VALUE) +#define Py_RETURN_FROM_SIGNAL_HANDLER(VALUE) \ + Py_FORCE_EXPANSION(RETSIGTYPE) ## _PySIGRETURN(VALUE) + #ifdef __cplusplus } #endif |