1 files changed, 33 insertions, 0 deletions
diff --git a/src/exit/at_quick_exit.c b/src/exit/at_quick_exit.c
new file mode 100644
index 0000000..e4b5d78
--- /dev/null
+++ b/src/exit/at_quick_exit.c
@@ -0,0 +1,33 @@
+#include <stdlib.h>
+#include "libc.h"
+#include "lock.h"
+#include "fork_impl.h"
+
+#define COUNT 32
+
+static void (*funcs[COUNT])(void);
+static int count;
+static volatile int lock[1];
+volatile int *const __at_quick_exit_lockptr = lock;
+
+void __funcs_on_quick_exit()
+{
+	void (*func)(void);
+	LOCK(lock);
+	while (count > 0) {
+		func = funcs[--count];
+		UNLOCK(lock);
+		func();
+		LOCK(lock);
+	}
+}
+
+int at_quick_exit(void (*func)(void))
+{
+	int r = 0;
+	LOCK(lock);
+	if (count == 32) r = -1;
+	else funcs[count++] = func;
+	UNLOCK(lock);
+	return r;
+}