[PATCH 1/8] configure.ac: add --enable-hybrid-sync option

[Daniel Santos]

This is the switch that turns on the patchset via the config.h macro
ENABLE_POSIX_SYNC.

Signed-off-by: Daniel Santos <daniel.santos at pobox.com>
---
 configure           | 34 ++++++++++++++++++++++++++++++++++
 configure.ac        | 12 ++++++++++++
 include/config.h.in |  6 ++++++
 3 files changed, 52 insertions(+)

diff --git a/configure b/configure
index 20371dc..097b689 100755
--- a/configure
+++ b/configure
@@ -800,6 +800,7 @@ enable_win16
 enable_win64
 enable_tests
 enable_maintainer_mode
+enable_hybrid_sync
 with_alsa
 with_capi
 with_cms
@@ -2155,6 +2156,8 @@ Optional Features:
   --disable-tests         do not build the regression tests
   --enable-maintainer-mode
                           enable maintainer-specific build rules
+  --enable-hybrid-sync    enable hybrid of server-side and process local
+                          synchronisation objects (experimental)
   --disable-largefile     omit support for large files
 
 Optional Packages:
@@ -3260,6 +3263,11 @@ if test "${enable_maintainer_mode+set}" = set; then :
   enableval=$enable_maintainer_mode;
 fi
 
+# Check whether --enable-hybrid-sync was given.
+if test "${enable_hybrid_sync+set}" = set; then :
+  enableval=$enable_hybrid_sync;
+fi
+
 
 
 # Check whether --with-alsa was given.
@@ -7057,6 +7065,32 @@ fi
 done
 
 
+for ac_header in semaphore.h
+do :
+  ac_fn_c_check_header_compile "$LINENO" "semaphore.h" "ac_cv_header_semaphore_h" "#ifdef HAVE_SEMAPHORE_H
+#include <semaphore.h>
+#endif
+"
+if test "x$ac_cv_header_semaphore_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_SEMAPHORE_H 1
+_ACEOF
+
+fi
+
+done
+
+
+enable_posix_sync=0
+if test "x$enable_hybrid_sync" = "xyes"
+then
+
+cat >>confdefs.h <<_ACEOF
+#define ENABLE_POSIX_SYNC 1
+_ACEOF
+
+fi
+
 for ac_header in linux/videodev.h linux/videodev2.h libv4l1.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
diff --git a/configure.ac b/configure.ac
index 1173190..e07ddf8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,6 +32,7 @@ AC_ARG_ENABLE(win16, AS_HELP_STRING([--disable-win16],[do not include Win16 supp
 AC_ARG_ENABLE(win64, AS_HELP_STRING([--enable-win64],[build a Win64 emulator on AMD64 (won't run Win32 binaries)]))
 AC_ARG_ENABLE(tests, AS_HELP_STRING([--disable-tests],[do not build the regression tests]))
 AC_ARG_ENABLE(maintainer-mode, AS_HELP_STRING([--enable-maintainer-mode],[enable maintainer-specific build rules]))
+AC_ARG_ENABLE(hybrid-sync, AS_HELP_STRING([--enable-hybrid-sync],[enable hybrid of server-side and process local synchronisation objects (experimental)]))
 
 AC_ARG_WITH(alsa,      AS_HELP_STRING([--without-alsa],[do not use the Alsa sound support]),
             [if test "x$withval" = "xno"; then ac_cv_header_sys_asoundlib_h=no; ac_cv_header_alsa_asoundlib_h=no; fi])
@@ -650,6 +651,17 @@ AC_CHECK_HEADERS([pthread_np.h],,,
 #include <pthread.h>
 #endif])
 
+AC_CHECK_HEADERS([semaphore.h],,,
+[#ifdef HAVE_SEMAPHORE_H
+#include <semaphore.h>
+#endif])
+
+enable_posix_sync=0
+if test "x$enable_hybrid_sync" = "xyes"
+then
+  AC_DEFINE_UNQUOTED(ENABLE_POSIX_SYNC, 1, [Define to 1 to enable hybrid synchronization.])
+fi
+
 AC_CHECK_HEADERS([linux/videodev.h linux/videodev2.h libv4l1.h],,,
 [#ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
diff --git a/include/config.h.in b/include/config.h.in
index eb61a94..6615a98 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -7,6 +7,9 @@
 /* Define to a function attribute for Microsoft hotpatch assembly prefix. */
 #undef DECLSPEC_HOTPATCH
 
+/* Define to 1 to enable hybrid synchronization. */
+#undef ENABLE_POSIX_SYNC
+
 /* Define to the file extension for executables. */
 #undef EXEEXT
 
@@ -759,6 +762,9 @@
 /* Define to 1 if you have the `select' function. */
 #undef HAVE_SELECT
 
+/* Define to 1 if you have the <semaphore.h> header file. */
+#undef HAVE_SEMAPHORE_H
+
 /* Define to 1 if you have the `sendmsg' function. */
 #undef HAVE_SENDMSG
 
-- 
2.4.6