diff options
| -rw-r--r-- | dist/ExtUtils-ParseXS/lib/perlxs.pod | 17 | ||||
| -rw-r--r-- | pod/perldelta.pod | 18 | ||||
| -rw-r--r-- | reentr.h | 2 | ||||
| -rw-r--r-- | regen/reentr.pl | 2 |
4 files changed, 29 insertions, 10 deletions
diff --git a/dist/ExtUtils-ParseXS/lib/perlxs.pod b/dist/ExtUtils-ParseXS/lib/perlxs.pod index e887d33ca7..6b21d966a9 100644 --- a/dist/ExtUtils-ParseXS/lib/perlxs.pod +++ b/dist/ExtUtils-ParseXS/lib/perlxs.pod @@ -2051,11 +2051,18 @@ you need to do is to instantiate a Perl interpreter. This wrapping happens always when compiling Perl core source (PERL_CORE is defined) or the Perl core extensions (PERL_EXT is -defined). When compiling XS code outside of Perl core the wrapping -does not take place. Note, however, that intermixing the _r-forms -(as Perl compiled for multithreaded operation will do) and the _r-less -forms is neither well-defined (inconsistent results, data corruption, -or even crashes become more likely), nor is it very portable. +defined). When compiling XS code outside of the Perl core, the wrapping +does not take place before Perl 5.28. Starting in that release you can + + #define PERL_REENTRANT + +in your code to enable the wrapping. It is advisable to do so if you +are using such functions, as intermixing the C<_r>-forms (as Perl compiled +for multithreaded operation will do) and the C<_r>-less forms is neither +well-defined (inconsistent results, data corruption, or even crashes +become more likely), nor is it very portable. Unfortunately, not all +systems have all the C<_r> forms, but using this C<#define> gives you +whatever protection that Perl is aware is available on each system. =head1 EXAMPLES diff --git a/pod/perldelta.pod b/pod/perldelta.pod index 7ef8c7fff8..c9dd65f83f 100644 --- a/pod/perldelta.pod +++ b/pod/perldelta.pod @@ -373,13 +373,25 @@ XXX Changes which affect the interface available to C<XS> code go here. Other significant internal changes for future core maintainers should be noted as well. -[ List each change as an =item entry ] - =over 4 =item * -XXX +XS modules can now automatically get reentrant versions of system +functions on threaded perls. + +By saying + + #define PERL_REENTRANT + +near the beginning of an C<XS> file, it will be compiled so that +whatever reentrant functions perl knows about on that system will +automatically and invisibly be used instead of the plain, non-reentrant +versions. For example, if you write C<getpwnam()> in your code, on a +system that has C<pwnam_r()> all calls to the former will be translated +invisibly into the latter. This does not happen except on threaded +perls, as they aren't needed otherwise. Be aware that which functions +have reentrant versions varies from system to system. =back @@ -23,7 +23,7 @@ */ #ifndef PERL_REENTR_API -# if defined(PERL_CORE) || defined(PERL_EXT) +# if defined(PERL_CORE) || defined(PERL_EXT) || defined(PERL_REENTRANT) # define PERL_REENTR_API 1 # else # define PERL_REENTR_API 0 diff --git a/regen/reentr.pl b/regen/reentr.pl index 397f8ed091..0dbb79b774 100644 --- a/regen/reentr.pl +++ b/regen/reentr.pl @@ -73,7 +73,7 @@ print $h <<EOF; */ #ifndef PERL_REENTR_API -# if defined(PERL_CORE) || defined(PERL_EXT) +# if defined(PERL_CORE) || defined(PERL_EXT) || defined(PERL_REENTRANT) # define PERL_REENTR_API 1 # else # define PERL_REENTR_API 0 |