[cairo] [PATCH 2/2] Workaround for systems lacking clock_gettime()

[Dave Yeo]

Fall back to gettimeofday() when system is missing clock_gettime().
Also include sys/time.h for systems such as OS/2 where the timeval struct is
located there.

Signed-off-by: Dave Yeo <dave.r.yeo at gmail.com>
---
 build/configure.ac.system    |    2 +-
 src/cairo-surface-observer.c |   49 +++++++++++++++++++++++++++++++++++------
 2 files changed, 42 insertions(+), 9 deletions(-)

diff --git a/build/configure.ac.system b/build/configure.ac.system
index b405740..f3d5483 100644
--- a/build/configure.ac.system
+++ b/build/configure.ac.system
@@ -112,7 +112,7 @@ AC_CHECK_HEADER(fenv.h,
 	[AC_CHECK_FUNCS(feenableexcept fedisableexcept feclearexcept)])
 
 dnl check for misc headers and functions
-AC_CHECK_HEADERS([libgen.h byteswap.h signal.h setjmp.h fenv.h])
+AC_CHECK_HEADERS([libgen.h byteswap.h signal.h setjmp.h fenv.h sys/time.h])
 AC_CHECK_FUNCS([vasnprintf link ctime_r drand48 flockfile funlockfile ffs])
 
 dnl check for win32 headers (this detects mingw as well)
diff --git a/src/cairo-surface-observer.c b/src/cairo-surface-observer.c
index 3c4521f..e0cbaa1 100644
--- a/src/cairo-surface-observer.c
+++ b/src/cairo-surface-observer.c
@@ -48,6 +48,16 @@
 #include "cairo-surface-subsurface-private.h"
 #include "cairo-reference-count-private.h"
 
+#if HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#if HAVE_CLOCK_TIME
+#define tspec timespec
+#else
+#define tspec timeval
+#endif
+
 static const cairo_surface_backend_t _cairo_surface_observer_backend;
 
 /* observation/stats */
@@ -623,16 +633,17 @@ add_record (cairo_observation_t *log,
     assert (status == CAIRO_INT_STATUS_SUCCESS);
 }
 
+#if HAVE_CLOCK_GETTIME
 static void
-start_timer (struct timespec *ts)
+start_timer (struct tspec *ts)
 {
     clock_gettime (CLOCK_MONOTONIC, ts);
 }
 
 static double
-stop_timer (const struct timespec *then)
+stop_timer (const struct tspec *then)
 {
-    struct timespec now;
+    struct tspec now;
     double elapsed;
 
     clock_gettime (CLOCK_MONOTONIC, &now);
@@ -642,6 +653,28 @@ stop_timer (const struct timespec *then)
     return elapsed;
 }
 
+#else
+
+static void
+start_timer (struct tspec *ts)
+{
+    gettimeofday (ts, NULL);
+}
+
+static double
+stop_timer (const struct tspec *then)
+{
+    struct tspec now;
+    double elapsed;
+
+    gettimeofday (&now, NULL);
+
+    elapsed = now.tv_usec - then->tv_usec;
+    elapsed += 1e6 * (now.tv_sec - then->tv_sec);
+    return elapsed;
+}
+#endif
+
 static void
 sync (cairo_surface_t *target, int x, int y)
 {
@@ -704,7 +737,7 @@ _cairo_surface_observer_paint (void *abstract_surface,
     cairo_composite_rectangles_t composite;
     cairo_rectangle_int_t extents;
     cairo_int_status_t status;
-    struct timespec ts;
+    struct tspec ts;
     double elapsed;
     int x, y;
 
@@ -790,7 +823,7 @@ _cairo_surface_observer_mask (void *abstract_surface,
     cairo_composite_rectangles_t composite;
     cairo_rectangle_int_t extents;
     cairo_int_status_t status;
-    struct timespec ts;
+    struct tspec ts;
     double elapsed;
     int x, y;
 
@@ -892,7 +925,7 @@ _cairo_surface_observer_fill (void			*abstract_surface,
     cairo_composite_rectangles_t composite;
     cairo_rectangle_int_t extents;
     cairo_int_status_t status;
-    struct timespec ts;
+    struct tspec ts;
     double elapsed;
     int x, y;
 
@@ -1007,7 +1040,7 @@ _cairo_surface_observer_stroke (void				*abstract_surface,
     cairo_composite_rectangles_t composite;
     cairo_rectangle_int_t extents;
     cairo_int_status_t status;
-    struct timespec ts;
+    struct tspec ts;
     double elapsed;
     int x, y;
 
@@ -1125,7 +1158,7 @@ _cairo_surface_observer_glyphs (void			*abstract_surface,
     cairo_rectangle_int_t extents;
     cairo_int_status_t status;
     cairo_glyph_t *dev_glyphs;
-    struct timespec ts;
+    struct tspec ts;
     double elapsed;
     int x, y;
 
-- 
1.7.2.3