Avoid using default lock implementation

Author: fjtrujy

newlib/configure.host

@@ -547,7 +547,7 @@ case "${host}" in
   mips*-ps2-*)
 	sys_dir=ps2
 	posix_dir=posix
-	newlib_cflags="${newlib_cflags} -G0 -DHAVE_NANOSLEEP -DHAVE_RENAME -DHAVE_FCNTL -D_NO_POSIX_SPAWN"
+	newlib_cflags="${newlib_cflags} -G0 -DHAVE_NANOSLEEP -DHAVE_RENAME -DHAVE_FCNTL -D_NO_POSIX_SPAWN -DHAVE_DD_LOCK"
 	;;
   mmix-knuth-mmixware)
 	sys_dir=mmixware

newlib/libc/misc/lock.c

@@ -81,7 +81,9 @@ subroutines are required for linking multi-threaded applications.
 
 /* dummy lock routines and static locks for single-threaded apps */
 
-#ifndef __SINGLE_THREAD__
+#include <newlib.h>
+
+#if defined(__SINGLE_THREAD__)
 
 #include <sys/lock.h>
 

newlib/libc/sys/ps2/sys/dirent.h

@@ -8,6 +8,7 @@ typedef struct __dirdesc {
     char *dd_buf;	/* buffer */
     int dd_len;		/* buffer length */
     int dd_size;	/* amount of data in buffer */
+    void *dd_lock;	/* lock */
 } DIR;
 
 # define __dirfd(dp)	((dp)->dd_fd)