add 'lumiera_free' as replacement for 'free'

lumiera_free() is for now just a static inline wraper around free()
Later this makes it easier to hook in some resource managing functions
or a Garbage Collector in.

Replaced all current uses of free()

src/backend/file.c

@@ -50,7 +50,7 @@ lumiera_file_destroy (LumieraFile self)
 {
   TRACE (file);
   lumiera_filedescriptor_release (self->descriptor);
-  free ((void*)self->name);
+  lumiera_free ((void*)self->name);
   return self;
 }
 
@@ -67,7 +67,7 @@ void
 lumiera_file_delete (LumieraFile self)
 {
   TRACE (file);
-  free (lumiera_file_destroy (self));
+  lumiera_free (lumiera_file_destroy (self));
 }
 
 

src/backend/filedescriptor.c

@@ -234,7 +234,7 @@ lumiera_filedescriptor_delete (LumieraFiledescriptor self)
   TODO ("release filehandle");
 
   lumiera_mutex_destroy (&self->lock);
-  free (self);
+  lumiera_free (self);
 
   lumiera_mutexacquirer_unlock (&registry_lock);
 }

src/backend/filehandlecache.c

@@ -58,7 +58,7 @@ lumiera_filehandlecache_delete (void)
       RESOURCE_FORGET (filehandlecache, lumiera_fhcache->rh);
       lumiera_mrucache_destroy (&lumiera_fhcache->cache);
       lumiera_mutex_destroy (&lumiera_fhcache->lock);
-      free (lumiera_fhcache);
+      lumiera_free (lumiera_fhcache);
       lumiera_fhcache = NULL;
     }
 }

src/lib/mrucache.c

@@ -19,6 +19,7 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "lib/safeclib.h"
 #include "lib/mrucache.h"
 
 
@@ -39,9 +40,9 @@ lumiera_mrucache_destroy (LumieraMruCache self)
     {
       llist_unlink (node);
       if (self->destructor_cb)
-        free (self->destructor_cb (node));
+        lumiera_free (self->destructor_cb (node));
       else
-        free (node);
+        lumiera_free (node);
     }
   self->cached = 0;
   return self;
@@ -52,7 +53,7 @@ lumiera_mrucache_age (LumieraMruCache self, int nelem)
 {
   REQUIRE (self);
   while (self->cached && nelem--)
-    free (lumiera_mrucache_pop (self));
+    lumiera_free (lumiera_mrucache_pop (self));
 
   return nelem;
 }

src/lib/safeclib.c

@@ -18,7 +18,8 @@
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
-#include "error.h"
+#include "lib/error.h"
+#include "lib/safeclib.h"
 
 #include <string.h>
 #include <stdlib.h>
@@ -114,8 +115,8 @@ lumiera_tmpbuf_freeall (void)
     {
       pthread_setspecific (lumiera_tmpbuf_tls_key, NULL);
       for (int idx = 0; idx < 64; ++idx)
-        free (buf->buffers[idx]);
-      free (buf);
+        lumiera_free (buf->buffers[idx]);
+      lumiera_free (buf);
     }
 }
 
@@ -133,7 +134,7 @@ lumiera_tmpbuf_provide (size_t size)
 
   if (buf->sizes[buf->idx] < size || buf->sizes[buf->idx] > 8*size)
     {
-      free (buf->buffers[buf->idx]);
+      lumiera_free (buf->buffers[buf->idx]);
       buf->sizes[buf->idx] = (size+4*sizeof(long)) & ~(4*sizeof(long)-1);
       buf->buffers[buf->idx] = lumiera_malloc (buf->sizes[buf->idx]);
     }

src/lib/safeclib.h

@@ -50,6 +50,18 @@ void*
 lumiera_calloc (size_t n, size_t size);
 
 
+/**
+ * Free previously allocated memory.
+ * @param mem pointer to the memory block obtained by lumiera_malloc or lumiera_calloc
+ */
+static inline void
+lumiera_free (void* mem)
+{
+  /* for now only a alias, might change in future */
+  free (mem);
+}
+
+
 /**
  * Duplicate a C string.
  * always succeeds or dies