?RCS: $Id: usethreads.U,v $
?RCS:
-?RCS: Copyright (c) 1998 Andy Dougherty
+?RCS: Copyright (c) 1998-2000 Andy Dougherty
?RCS:
?RCS: You may distribute under the terms of either the GNU General Public
?RCS: License or the Artistic License, as specified in the README file.
?RCS:
?RCS: $Log: usethreads.U,v $
?RCS:
-?MAKE:usethreads d_oldpthreads: Myread Oldconfig Setvar test cat
+?MAKE:usethreads useithreads d_oldpthreads usereentrant: \
+ Myread Oldconfig Setvar test cat
?MAKE: -pick add $@ %<
?Y:TOP
?S:usethreads:
?S: This variable conditionally defines the USE_THREADS symbol,
?S: and indicates that Perl should be built to use threads.
?S:.
+?S:useithreads:
+?S: This variable conditionally defines the USE_ITHREADS symbol,
+?S: and indicates that Perl should be built to use the interpreter-based
+?S: threading implementation.
+?S:.
?X: I'm putting old_pthreads in this unit because it might eventually
?X: be part of an automatic determination to see if we can use threads
?X: at all.
?S: draft POSIX threads API. This is only potentially meaningful if
?S: usethreads is set.
?S:.
+?S:usereentrant:
+?S: This variable conditionally defines the USE_REENTRANT_API symbol,
+?S: which indicates that the thread code may try to use the various
+?S: _r versions of library functions. This is only potentially
+?S: meaningful if usethreads is set and is very experimental, it is
+?S: not even prompted for.
+?S:.
+?C:USE_ITHREADS:
+?C: This symbol, if defined, indicates that Perl should be built to
+?C: use the interpreter-based threading implementation.
+?C:.
?C:USE_THREADS:
?C: This symbol, if defined, indicates that Perl should
-?C: be built to use threads.
+?C: be built to use threads. At present, it is a synonym for
+?C: and USE_ITHREADS, but eventually the source ought to be
+?C: changed to use this to mean _any_ threading implementation.
?C:.
?C:OLD_PTHREADS_API:
?C: This symbol, if defined, indicates that Perl should
?C: be built to use the old draft POSIX threads API.
?C:.
-?H:?%<:#ifndef USE_TTHREADS
-?H:?%<:#$usethreads USE_THREADS /**/
-?H:?%<:#endif
+?C:USE_REENTRANT_API:
+?C: This symbol, if defined, indicates that Perl should
+?C: try to use the various _r versions of library functions.
+?C: This is extremely experimental.
+?C:.
+?H:#$useithreads USE_ITHREADS /**/
+?H:#$usethreads USE_THREADS /**/
?H:#$d_oldpthreads OLD_PTHREADS_API /**/
+?H:#$usereentrant USE_REENTRANT_API /**/
?H:.
?LINT:set usethreads d_oldpthreads
?INIT:: set usethreads on the Configure command line to enable threads.
+?INIT:usereentrant='undef'
?F:!usethreads.cbu
+: Do we want threads support and if so, what type
?X: We should really have some explanatory text here, and some
?X: automatic setting of sensible defaults.
+case "$usethreads" in
+$define|true|[yY]*) dflt='y';;
+*) # Catch case where user specified ithreads but
+ # forgot -Dusethreads (A.D. 4/2002)
+ case "$useithreads" in
+ *$define*) dflt='y';;
+ *) dflt='n';;
+ esac
+ ;;
+esac
cat <<EOM
-Perl can be built to take advantage of threads, on some systems.
-To do so, Configure must be run with -Dusethreads.
+Perl can be built to offer a form of threading support on some systems
+To do so, Configure can be run with -Dusethreads.
-Note that threading is a highly experimental feature, and
-some known race conditions still remain. If you choose to try
-it, be very sure to not actually deploy it for production
-purposes. README.threads has more details, and is required
-reading if you enable threads.
+Note that Perl built with threading support runs slightly slower
+and uses slightly more memory than plain Perl.
+
+If this doesn't make any sense to you, just accept the default '$dflt'.
EOM
-case "$usethreads" in
-$define|true|[yY]*) dflt='y';;
-*) dflt='n';;
-esac
rp='Build a threading Perl?'
. ./myread
case "$ans" in
-y|Y) val="$define" ;;
+y|Y) val="$define" ;;
*) val="$undef" ;;
esac
set usethreads
-eval $setvar
+eval $setvar
+
+useithreads="$usethreads"
-?X: Check out what kind of threads api we have
+?X: Check out what kind of threads API we have
case "$d_oldpthreads" in
'') : Configure tests would be welcome here. For now, assume undef.
val="$undef" ;;
?X: In general, -lpthread needs to come before -lc but after other
?X: libraries such as -lgdbm and such like. We assume here that -lc
-?X: is present in libswanted. If that fails to be true in, then this
+?X: is present in libswanted. If that fails to be true, then this
?X: can be changed to add pthread to the very end of libswanted.
-case "$usethreads" in
-"$define"|true|[yY]*)
: Look for a hint-file generated 'call-back-unit'. If the
: user has specified that a threading perl is to be built,
: we may need to set or change some other defaults.
- if $test -f usethreads.cbu; then
- echo "Your platform has some specific hints for threaded builds, using them..."
- . ./usethreads.cbu
- else
+if $test -f usethreads.cbu; then
+ echo "Your platform has some specific hints regarding threaded builds, using them..."
+ . ./usethreads.cbu
+else
+ case "$usethreads" in
+ "$define"|true|[yY]*)
$cat <<EOM
-(Your platform doesn't have any specific hints for threaded builds.
+(Your platform does not have any specific hints for threaded builds.
Assuming POSIX threads, then.)
EOM
- fi
- ;;
-esac
+ ;;
+ esac
+fi
https://perl5.git.perl.org / metaconfig.git / blobdiff