initial check-in, version 0.5.0

src/thread/pthread_cancel.c

@@ -0,0 +1,7 @@
+#define SYSCALL_RETURN_ERRNO
+#include "pthread_impl.h"
+
+int pthread_cancel(pthread_t t)
+{
+	return syscall3(__NR_tgkill, t->pid, t->tid, SIGCANCEL);
+}