config-scripts/cups-threads.m4

   1 dnl
   2 dnl Threading stuff for CUPS.
   3 dnl
   4 dnl Copyright 2007-2011 by Apple Inc.
   5 dnl Copyright 1997-2005 by Easy Software Products, all rights reserved.
   6 dnl
   7 dnl These coded instructions, statements, and computer programs are the
   8 dnl property of Apple Inc. and are protected by Federal copyright
   9 dnl law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  10 dnl which should have been included with this file.  If this file is
  11 dnl file is missing or damaged, see the license at "http://www.cups.org/".
  12 dnl
  13
  14 AC_ARG_ENABLE(threads, [  --disable-threads       disable multi-threading support])
  15
  16 have_pthread=no
  17 PTHREAD_FLAGS=""
  18
  19 if test "x$enable_threads" != xno; then
  20         AC_CHECK_HEADER(pthread.h, AC_DEFINE(HAVE_PTHREAD_H))
  21
  22         if test x$ac_cv_header_pthread_h = xyes; then
  23                 dnl Check various threading options for the platforms we support
  24                 for flag in -lpthreads -lpthread -pthread; do
  25                         AC_MSG_CHECKING([for pthread_create using $flag])
  26                         SAVELIBS="$LIBS"
  27                         LIBS="$flag $LIBS"
  28                         AC_TRY_LINK([#include <pthread.h>],
  29                                 [pthread_create(0, 0, 0, 0);],
  30                                 have_pthread=yes,
  31                                 LIBS="$SAVELIBS")
  32                         AC_MSG_RESULT([$have_pthread])
  33
  34                         if test $have_pthread = yes; then
  35                                 PTHREAD_FLAGS="-D_THREAD_SAFE -D_REENTRANT"
  36
  37                                 # Solaris requires -D_POSIX_PTHREAD_SEMANTICS to
  38                                 # be POSIX-compliant... :(
  39                                 if test $uname = SunOS; then
  40                                         PTHREAD_FLAGS="$PTHREAD_FLAGS -D_POSIX_PTHREAD_SEMANTICS"
  41                                 fi
  42                                 break
  43                         fi
  44                 done
  45         fi
  46 fi
  47
  48 AC_SUBST(PTHREAD_FLAGS)