--- /dev/null
+#include <stdlib.h>
+#include "libc.h"
+
+#define COUNT 32
+
+static void (*funcs[COUNT])(void);
+static int count;
+static int lock[2];
+
+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))
+{
+ if (count == 32) return -1;
+ LOCK(lock);
+ funcs[count++] = func;
+ UNLOCK(lock);
+ return 0;
+}