initial check-in, version 0.5.0

src/thread/pthread_detach.c

@@ -0,0 +1,11 @@
+#include "pthread_impl.h"
+
+int pthread_detach(pthread_t t)
+{
+	/* Cannot detach a thread that's already exiting */
+	if (a_xchg(&t->exitlock, 1))
+		return pthread_join(t, 0);
+	t->detached = 1;
+	t->exitlock = 0;
+	return 0;
+}