Add read-write mutexes to canvas pixels. New error infrastructure.

1 files changed, 74 insertions, 0 deletions

diff --git a/libdimension/error.c b/libdimension/error.c
new file mode 100644
index 0000000..b91c192
--- /dev/null
+++ b/libdimension/error.c
@@ -0,0 +1,74 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of Dimension.                                       *
+ *                                                                       *
+ * Dimension is free software; you can redistribute it and/or modify it  *
+ * under the terms of the GNU Lesser General Public License as published *
+ * by the Free Software Foundation; either version 3 of the License, or  *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * Dimension is distributed in the hope that it will be useful, but      *
+ * WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+#include "dimension.h"
+#include <pthread.h>
+#include <stdio.h>  /* For fprintf() */
+#include <stdlib.h> /* For exit()    */
+
+static dmnsn_severity dmnsn_resilience = DMNSN_SEVERITY_MEDIUM;
+static pthread_mutex_t dmnsn_resilience_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+void
+dmnsn_report_error(dmnsn_severity severity, const char *func, const char *str)
+{
+  if (severity >= dmnsn_get_resilience()) {
+    fprintf(stderr, "Dimension ERROR:   %s(): %s\n", func, str);
+    exit(1);
+  } else {
+    fprintf(stderr, "Dimension WARNING: %s(): %s\n", func, str);
+  }
+}
+
+dmnsn_severity
+dmnsn_get_resilience()
+{
+  dmnsn_severity resilience;
+  if (pthread_mutex_lock(&dmnsn_resilience_mutex) != 0) {
+    fprintf(stderr, "Dimension WARNING: %s(): %s\n", __func__,
+            "Couldn't lock resilience mutex.");
+  }
+  resilience = dmnsn_resilience;
+  if (pthread_mutex_unlock(&dmnsn_resilience_mutex) != 0) {
+    fprintf(stderr, "Dimension WARNING: %s(): %s\n", __func__,
+            "Couldn't unlock resilience mutex.");
+  }
+  return resilience;
+}
+
+void
+dmnsn_set_resilience(dmnsn_severity resilience)
+{
+  if (resilience > DMNSN_SEVERITY_HIGH) {
+    fprintf(stderr, "Dimension ERROR: %s(): %s\n", __func__,
+            "Resilience has wrong value.");
+    exit(1);
+  }
+
+  if (pthread_mutex_lock(&dmnsn_resilience_mutex) != 0) {
+    fprintf(stderr, "Dimension WARNING: %s(): %s\n", __func__,
+            "Couldn't lock resilience mutex.");
+  }
+  dmnsn_resilience = resilience;
+  if (pthread_mutex_unlock(&dmnsn_resilience_mutex) != 0) {
+    fprintf(stderr, "Dimension WARNING: %s(): %s\n", __func__,
+            "Couldn't unlock resilience mutex.");
+  }
+}