Add graph references

references/igraph-1.0.1/tests/unit/tls1.c

@@ -0,0 +1,52 @@
+/*
+   igraph library.
+   Copyright (C) 2011-2012  Gabor Csardi <csardi.gabor@gmail.com>
+   334 Harvard street, Cambridge MA, 02139 USA
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301 USA
+
+*/
+
+#include <igraph.h>
+#include <pthread.h>
+
+void *thread_function(void *arg) {
+    IGRAPH_UNUSED(arg);
+    IGRAPH_FINALLY(igraph_free, NULL);
+    return 0;
+}
+
+int main(void) {
+    pthread_t thread_id;
+    void *exit_status;
+
+    /* Skip if igraph is not thread-safe */
+    if (!IGRAPH_THREAD_SAFE) {
+        return 77;
+    }
+
+    /* Run a thread that leaves some junk in the error stack */
+    pthread_create(&thread_id, NULL, thread_function, 0);
+    pthread_join(thread_id, &exit_status);
+
+    /* Check that the error stack is not common */
+    if (!IGRAPH_FINALLY_STACK_EMPTY) {
+        printf("Foobar\n");
+        return 1;
+    }
+
+    return 0;
+}