diff --git a/include/arrows.h b/include/arrows.h
new file mode 100644
index 0000000..9689ffe
--- /dev/null
+++ b/include/arrows.h
@@ -0,0 +1,49 @@
+//=-------------------------------------------------------------------------=//
+//  Local workers definition                                                 //
+//                                                                           //
+//  Copyright © 2021 The Gem-graph Project                                   //
+//                                                                           //
+//  This file is part of gem-graph.                                          //
+//                                                                           //
+//  This program is free software: you can redistribute it and/or modify     //
+//  it under the terms of the GNU Affero General Public License as           //
+//  published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.                      //
+//                                                                           //
+//  You should have received a copy of the GNU Affero General Public License //
+//  along with this program.  If not, see <https://www.gnu.org/licenses/>.   //
+//=-------------------------------------------------------------------------=//
+
+#ifndef BASE_H
+    #include "../include/base.h"
+#endif
+
+static inline int createArrowLock(ArrowArray_t *arrowArray)
+{
+    return pthread_spin_init(&arrowArray->lock, PTHREAD_PROCESS_SHARED);
+}
+
+static inline int destroyArrowLock(ArrowArray_t *arrowArray)
+{
+    return pthread_spin_destroy(&arrowArray->lock);
+}
+
+static inline int acquireArrowLock(ArrowArray_t *arrowArray)
+{
+    return pthread_spin_lock(&arrowArray->lock);
+}
+
+static inline int acquireNonBlockinArrowgLock(ArrowArray_t *arrowArray)
+{
+    return pthread_spin_trylock(&arrowArray->lock);
+}
+
+static inline int releaseArrowLock(ArrowArray_t *arrowArray)
+{
+    return pthread_spin_unlock(&arrowArray->lock);
+}
diff --git a/src/tests/test_realloc b/src/tests/test_realloc
new file mode 100755
index 0000000..03248fc
Binary files /dev/null and b/src/tests/test_realloc differ
diff --git a/src/tests/test_realloc.c b/src/tests/test_realloc.c
new file mode 100644
index 0000000..1ddeab6
--- /dev/null
+++ b/src/tests/test_realloc.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    int *a = (int*) malloc(7 * sizeof(int));
+
+    printf("Salut! Tableau d'entiers à l'adresse %p\n", a);
+
+    int *b = (int*) realloc(a, 8*sizeof(int));
+
+    printf("Salut! Tableau d'entiers à l'adresse %p\n", b);
+}