When the pool gets too big, switch to just the file, not memory

memfile.hpp

@@ -3,15 +3,19 @@
 
 #include <atomic>
 #include <string>
+#include "errors.hpp"
 
 struct memfile {
 	int fd = 0;
 	std::string map;
 	unsigned long tree = 0;
+	FILE *fp = NULL;
+	size_t off = 0;
 };
 
 struct memfile *memfile_open(int fd);
 int memfile_close(struct memfile *file);
 int memfile_write(struct memfile *file, void *s, long long len);
+void memfile_full(struct memfile *file);
 
 #endif