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Commit02d847f

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Add --with-threads configure option to control threaded libpq.
1 parent26188e8 commit02d847f

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5 files changed

+112
-42
lines changed

5 files changed

+112
-42
lines changed

‎configure

Lines changed: 63 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -855,6 +855,7 @@ Optional Packages:
855855
--with-libraries=DIRS look for additional libraries in DIRS
856856
--with-libs=DIRS alternative spelling of --with-libraries
857857
--with-pgport=PORTNUM change default port number 5432
858+
--with-threads allow libpq to be thread-safe
858859
--with-tcl build Tcl and Tk interfaces
859860
--without-tk do not build Tk interfaces if Tcl is enabled
860861
--with-tclconfig=DIR tclConfig.sh and tkConfig.sh are in DIR
@@ -2809,6 +2810,41 @@ echo "$as_me: WARNING: *** Library directory $dir does not exist." >&2;}
28092810
done
28102811
IFS=$ac_save_IFS
28112812
2813+
#
2814+
# Enable libpq to be thread-safe
2815+
#
2816+
echo"$as_me:$LINENO: checking allow threaded libpq">&5
2817+
echo$ECHO_N"checking allow threaded libpq...$ECHO_C">&6
2818+
2819+
2820+
2821+
# Check whether --with-threads or --without-threads was given.
2822+
iftest"${with_threads+set}" =set;then
2823+
withval="$with_threads"
2824+
2825+
case$withvalin
2826+
yes)
2827+
:
2828+
;;
2829+
no)
2830+
:
2831+
;;
2832+
*)
2833+
{ {echo"$as_me:$LINENO: error: no argument expected for --with-threads option">&5
2834+
echo"$as_me: error: no argument expected for --with-threads option">&2;}
2835+
{ (exit 1);exit 1; }; }
2836+
;;
2837+
esac
2838+
2839+
else
2840+
with_threads=no
2841+
2842+
fi;
2843+
2844+
echo"$as_me:$LINENO: result:$with_threads">&5
2845+
echo"${ECHO_T}$with_threads">&6
2846+
2847+
28122848
#
28132849
# Tcl/Tk
28142850
#
@@ -3550,7 +3586,7 @@ rm -f conftest*
35503586
#
35513587
# Pthreads
35523588
#
3553-
3589+
iftest"$with_threads" = yes;then
35543590
echo"$as_me:$LINENO: checking for ANSI C header files">&5
35553591
echo$ECHO_N"checking for ANSI C header files...$ECHO_C">&6
35563592
iftest"${ac_cv_header_stdc+set}" =set;then
@@ -3850,25 +3886,38 @@ echo "${ECHO_T}$ac_cv_header_pthread_h" >&6
38503886
38513887
fi
38523888
iftest$ac_cv_header_pthread_h = yes;then
3853-
3854-
cat>>confdefs.h<<\_ACEOF
3855-
#define HAVE_THREADS 1
3856-
_ACEOF
3857-
3889+
:
3890+
else
3891+
{ {echo"$as_me:$LINENO: error: pthread.h not found, required for --with-threads">&5
3892+
echo"$as_me: error: pthread.h not found, required for --with-threads">&2;}
3893+
{ (exit 1);exit 1; }; }
38583894
fi
38593895
38603896
3861-
iftest! -z"$HAVE_THREADS"
3862-
then
3863-
case$host_osin
3864-
# BSD/OS and NetBSD require no special libraries or flags
3865-
netbsd*|bsdi*) ;;
3897+
case$host_osin
3898+
netbsd*|bsdi*)
3899+
# these require no special flags or libraries
3900+
;;
38663901
freebsd2*|freebsd3*|freebsd4*) THREAD_CFLAGS="-pthread" ;;
38673902
freebsd*) THREAD_LIBS="-lc_r" ;;
38683903
linux*) THREAD_LIBS="-lpthread"
38693904
THREAD_CFLAGS="-D_REENTRANT" ;;
3870-
# other operating systems might fail because they have pthread.h but need
3871-
# special libs we don't know about yet.
3905+
*)
3906+
# other operating systems might fail because they have pthread.h but need
3907+
# special libs we don't know about yet.
3908+
{ {echo"$as_me:$LINENO: error:
3909+
Cannot enable threads on your platform.
3910+
Please report your platform threading info to the PostgreSQL mailing lists
3911+
so it can be added to the next release. Report any compile or link flags,
3912+
or libraries required for threading support.
3913+
">&5
3914+
echo"$as_me: error:
3915+
Cannot enable threads on your platform.
3916+
Please report your platform threading info to the PostgreSQL mailing lists
3917+
so it can be added to the next release. Report any compile or link flags,
3918+
or libraries required for threading support.
3919+
">&2;}
3920+
{ (exit 1);exit 1; }; }
38723921
esac
38733922
fi
38743923
@@ -17540,6 +17589,7 @@ s,@CPP@,$CPP,;t t
1754017589
s,@GCC@,$GCC,;t t
1754117590
s,@autodepend@,$autodepend,;t t
1754217591
s,@INCLUDES@,$INCLUDES,;t t
17592+
s,@with_threads@,$with_threads,;t t
1754317593
s,@with_tcl@,$with_tcl,;t t
1754417594
s,@with_tk@,$with_tk,;t t
1754517595
s,@with_perl@,$with_perl,;t t

‎configure.in

Lines changed: 24 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
dnl Process this file with autoconf to produce a configure script.
2-
dnl $Header: /cvsroot/pgsql/configure.in,v 1.260 2003/06/12 16:05:09 tgl Exp $
2+
dnl $Header: /cvsroot/pgsql/configure.in,v 1.261 2003/06/13 23:10:07 momjian Exp $
33
dnl
44
dnl Developers, please strive to achieve this order:
55
dnl
@@ -319,6 +319,14 @@ for dir in $LIBRARY_DIRS $SRCH_LIB; do
319319
done
320320
IFS=$ac_save_IFS
321321

322+
#
323+
# Enable libpq to be thread-safe
324+
#
325+
AC_MSG_CHECKING([allow threaded libpq])
326+
PGAC_ARG_BOOL(with, threads, no, [ --with-threads allow libpq to be thread-safe])
327+
AC_MSG_RESULT([$with_threads])
328+
AC_SUBST(with_threads)
329+
322330
#
323331
# Tcl/Tk
324332
#
@@ -544,20 +552,25 @@ AC_SUBST(ELF_SYS)
544552
#
545553
# Pthreads
546554
#
547-
548-
AC_CHECK_HEADER(pthread.h,
549-
[AC_DEFINE(HAVE_THREADS, 1, [Define to 1 if you have the threads interface.])])
550-
if test ! -z "$HAVE_THREADS"
551-
then
552-
case $host_os in
553-
# BSD/OS and NetBSD require no special libraries or flags
554-
netbsd*|bsdi*) ;;
555+
if test "$with_threads" = yes; then
556+
AC_CHECK_HEADER(pthread.h, [], [AC_MSG_ERROR([pthread.h not found, required for --with-threads])])
557+
case $host_os in
558+
netbsd*|bsdi*)
559+
# these require no special flags or libraries
560+
;;
555561
freebsd2*|freebsd3*|freebsd4*) THREAD_CFLAGS="-pthread" ;;
556562
freebsd*) THREAD_LIBS="-lc_r" ;;
557563
linux*) THREAD_LIBS="-lpthread"
558564
THREAD_CFLAGS="-D_REENTRANT" ;;
559-
# other operating systems might fail because they have pthread.h but need
560-
# special libs we don't know about yet.
565+
*)
566+
# other operating systems might fail because they have pthread.h but need
567+
# special libs we don't know about yet.
568+
AC_MSG_ERROR([
569+
Cannot enable threads on your platform.
570+
Please report your platform threading info to the PostgreSQL mailing lists
571+
so it can be added to the next release. Report any compile or link flags,
572+
or libraries required for threading support.
573+
])
561574
esac
562575
fi
563576
AC_SUBST(THREAD_LIBS)

‎doc/src/sgml/installation.sgml

Lines changed: 10 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/installation.sgml,v 1.133 2003/06/11 06:56:06 momjian Exp $ -->
1+
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/installation.sgml,v 1.134 2003/06/13 23:10:07 momjian Exp $ -->
22

33
<chapter id="installation">
44
<title><![%standalone-include[<productname>PostgreSQL</>]]>
@@ -914,6 +914,15 @@ JAVACMD=$JAVA_HOME/bin/java
914914
</listitem>
915915
</varlistentry>
916916

917+
<varlistentry>
918+
<term><option>--with-threads</option></term>
919+
<listitem>
920+
<para>
921+
Allow separate libpq threads to safely control their private connection handles.
922+
</para>
923+
</listitem>
924+
</varlistentry>
925+
917926
<varlistentry>
918927
<term><option>--without-zlib</option></term>
919928
<listitem>

‎doc/src/sgml/libpq.sgml

Lines changed: 15 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$Header: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v 1.123 2003/05/14 03:25:58 tgl Exp $
2+
$Header: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v 1.124 2003/06/13 23:10:07 momjian Exp $
33
-->
44

55
<chapter id="libpq">
@@ -509,11 +509,6 @@ typedef struct
509509
is leaked for each call to <function>PQconndefaults</function>.
510510
</para>
511511

512-
<para>
513-
In <productname>PostgreSQL</productname> versions before 7.0, <function>PQconndefaults</function> returned a pointer
514-
to a static array, rather than a dynamically allocated array. That
515-
was not thread-safe, so the behavior has been changed.
516-
</para>
517512
</listitem>
518513
</varlistentry>
519514

@@ -2549,17 +2544,23 @@ If the permissions are less strict than this, the file will be ignored.
25492544
</indexterm>
25502545

25512546
<para>
2552-
<application>libpq</application> is thread-safe as of
2553-
<productname>PostgreSQL</productname> 7.0, so long as no two threads
2554-
attempt to manipulate the same <structname>PGconn</> object at the same
2555-
time. In particular, you cannot issue concurrent commands from different
2556-
threads through the same connection object. (If you need to run
2557-
concurrent commands, start up multiple connections.)
2547+
<application>libpq</application> is thread-safe if the library is
2548+
compiled using the <literal>--with-threads</>
2549+
<filename>configure</filename> command-line option. (You might need to
2550+
use other threading command-line options to compile your client code.)
2551+
</para>
2552+
2553+
<para>
2554+
One restriction is that no two threads attempt to manipulate the same
2555+
<structname>PGconn</> object at the same time. In particular, you cannot
2556+
issue concurrent commands from different threads through the same
2557+
connection object. (If you need to run concurrent commands, start up
2558+
multiple connections.)
25582559
</para>
25592560

25602561
<para>
2561-
<structname>PGresult</> objects are read-only after creation, and so can bepassed around
2562-
freely between threads.
2562+
<structname>PGresult</> objects are read-only after creation, and so can be
2563+
passed aroundfreely between threads.
25632564
</para>
25642565

25652566
<para>

‎src/include/pg_config.h.in

Lines changed: 0 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -468,9 +468,6 @@
468468
/* Define to 1 if you have the <termios.h> header file. */
469469
#undef HAVE_TERMIOS_H
470470

471-
/* Define to 1 if you have the threads interface. */
472-
#undef HAVE_THREADS
473-
474471
/* Define to 1 if your `struct tm' has `tm_zone'. Deprecated, use
475472
`HAVE_STRUCT_TM_TM_ZONE' instead. */
476473
#undef HAVE_TM_ZONE

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