[babl] babl-fish-reference: add lock to part of float reference

[Øyvind "pippin" Kolås <ok src gnome org>]

commit ed4238307a5ce6c79cf320a36c8310181193385b
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Sep 4 19:09:07 2018 +0200

    babl-fish-reference: add lock to part of float reference
    
    This fixes problems that occur during GEGLs documentation gallery build
    when multiple threads are in use (the default). The critical section has
    experimentally been made as short as possible to avoid babl memory
    inconsistencies - without identifing the core race.

 babl/babl-fish-reference.c     | 2 ++
 babl/babl-internal.c           | 3 +++
 babl/babl-internal.h           | 1 +
 tools/babl_fish_path_fitness.c | 2 +-
 4 files changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/babl/babl-fish-reference.c b/babl/babl-fish-reference.c
index 619ceb5..6d1aa84 100644
--- a/babl/babl-fish-reference.c
+++ b/babl/babl-fish-reference.c
@@ -900,6 +900,7 @@ babl_fish_reference_process_float (const Babl *babl,
       return;
     }
 
+    babl_mutex_lock (babl_reference_mutex);
     if (babl->fish.source->format.type[0] == type_float &&
         BABL(babl->fish.source)->format.components ==
         BABL(babl->fish.source)->format.model->components && 0)
@@ -961,6 +962,7 @@ babl_fish_reference_process_float (const Babl *babl,
           n);
       }
     }
+    babl_mutex_unlock (babl_reference_mutex);
 
     if (((babl->fish.source)->format.space !=
         ((babl->fish.destination)->format.space)))
diff --git a/babl/babl-internal.c b/babl/babl-internal.c
index 2f3c42e..5609720 100644
--- a/babl/babl-internal.c
+++ b/babl/babl-internal.c
@@ -82,6 +82,7 @@ BablMutex *babl_format_mutex;
 #if BABL_DEBUG_MEM
 BablMutex *babl_debug_mutex;
 #endif
+BablMutex *babl_reference_mutex;
 
 void
 babl_internal_init (void)
@@ -89,6 +90,7 @@ babl_internal_init (void)
   babl_set_malloc (malloc);
   babl_set_free (free);
   babl_format_mutex = babl_mutex_new ();
+  babl_reference_mutex = babl_mutex_new ();
 #if BABL_DEBUG_MEM
   babl_debug_mutex = babl_mutex_new ();
 #endif
@@ -98,6 +100,7 @@ void
 babl_internal_destroy (void)
 {
   babl_mutex_destroy (babl_format_mutex);
+  babl_mutex_destroy (babl_reference_mutex);
 #if BABL_DEBUG_MEM
   babl_mutex_destroy (babl_debug_mutex);
 #endif
diff --git a/babl/babl-internal.h b/babl/babl-internal.h
index 8f31434..73fe18f 100644
--- a/babl/babl-internal.h
+++ b/babl/babl-internal.h
@@ -242,6 +242,7 @@ babl_fatal (const char *format, ...)
 extern int   babl_hmpf_on_name_lookups;
 extern int   babl_in_fish_path;
 extern BablMutex *babl_format_mutex;
+extern BablMutex *babl_reference_mutex;
 
 #define BABL_DEBUG_MEM 0
 #if BABL_DEBUG_MEM
diff --git a/tools/babl_fish_path_fitness.c b/tools/babl_fish_path_fitness.c
index ffd81ab..92c5935 100644
--- a/tools/babl_fish_path_fitness.c
+++ b/tools/babl_fish_path_fitness.c
@@ -56,7 +56,7 @@ static char *utf8_bar[]={"·", "█", "▇", "▆", "▅", "▄", "▃", "▂",
 static char *utf8_bar[]={" ","1","2","3","4","5","6","7","8"};
 */
 
-#define NUM_TEST_PIXELS  (1024*16)
+#define NUM_TEST_PIXELS  (1024*1024)
 static float test_pixels_float[NUM_TEST_PIXELS*4];
 static char  test_pixels_in[NUM_TEST_PIXELS * 6 * 8];
 static char  test_pixels_out[NUM_TEST_PIXELS * 6 * 8];