[Qemu-devel] PATCH: enable -clock dynticks for non-linux hosts

[Juergen Lock]

This does a configure check for posix timers instead of only enabling
them on linux (and w32) hosts, so that -clock dynticks also works on
FreeBSD >= 7.0 (and possibly others.)

Index: qemu/configure
@@ -1025,11 +1025,26 @@
   rt=yes
 fi
 
+##########################################
+# posix timer probe
+cat > $TMPC <<EOF
+#include <time.h>
+int main(void) { timer_create(CLOCK_REALTIME, (struct sigevent *)NULL, 
(timer_t *)NULL); return 0; }
+EOF
+posixtimer=no
+if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
+  posixtimer=yes
+elif $cc $ARCH_CFLAGS -o $TMPE $TMPC -lrt 2> /dev/null ; then
+  posixtimer=yes
+  rt=yes
+fi
+
 if test "$rt" = "yes" ; then
   # Hack, we should have a general purpose LIBS for this sort of thing
   AIOLIBS="$AIOLIBS -lrt"
 fi
 
+
 if test "$mingw32" = "yes" ; then
   if test -z "$prefix" ; then
       prefix="c:\\\\Program Files\\\\Qemu"
@@ -1403,6 +1418,9 @@
   echo "#define HAVE_FDT 1" >> $config_h
   echo "FDT_LIBS=-lfdt" >> $config_mak
 fi
+if test "$posixtimer" = "yes" ; then
+  echo "#define HAVE_POSIX_TIMER 1" >> $config_h
+fi
 
 # XXX: suppress that
 if [ "$bsd" = "yes" ] ; then
Index: qemu/vl.c
@@ -918,12 +918,16 @@
 static int unix_start_timer(struct qemu_alarm_timer *t);
 static void unix_stop_timer(struct qemu_alarm_timer *t);
 
-#ifdef __linux__
+#ifdef HAVE_POSIX_TIMER
 
 static int dynticks_start_timer(struct qemu_alarm_timer *t);
 static void dynticks_stop_timer(struct qemu_alarm_timer *t);
 static void dynticks_rearm_timer(struct qemu_alarm_timer *t);
 
+#endif
+
+#ifdef __linux__
+
 static int hpet_start_timer(struct qemu_alarm_timer *t);
 static void hpet_stop_timer(struct qemu_alarm_timer *t);
 
@@ -1001,9 +1005,11 @@
 
 static struct qemu_alarm_timer alarm_timers[] = {
 #ifndef _WIN32
-#ifdef __linux__
+#ifdef HAVE_POSIX_TIMER
     {"dynticks", ALARM_FLAG_DYNTICKS, dynticks_start_timer,
      dynticks_stop_timer, dynticks_rearm_timer, NULL},
+#endif
+#ifdef __linux__
     /* HPET - if available - is preferred */
     {"hpet", 0, hpet_start_timer, hpet_stop_timer, NULL, NULL},
     /* ...otherwise try RTC */
@@ -1361,7 +1367,7 @@
     return delta;
 }
 
-#if defined(__linux__) || defined(_WIN32)
+#if defined(HAVE_POSIX_TIMER) || defined(_WIN32)
 static uint64_t qemu_next_deadline_dyntick(void)
 {
     int64_t delta;
@@ -1506,6 +1512,10 @@
     close(rtc_fd);
 }
 
+#endif /* defined(__linux__) */
+
+#ifdef HAVE_POSIX_TIMER
+
 static int dynticks_start_timer(struct qemu_alarm_timer *t)
 {
     struct sigevent ev;
@@ -1577,7 +1587,7 @@
     }
 }
 
-#endif /* defined(__linux__) */
+#endif /* defined(HAVE_POSIX_TIMER) */
 
 static int unix_start_timer(struct qemu_alarm_timer *t)
 {

Signed-off-by: Juergen Lock <address@hidden>