code review 812041: libcgo: initial mingw port work - builds but untested

src/libcgo/mingw_amd64.c

Index: src/libcgo/mingw_amd64.c
===================================================================
new file mode 100755
--- /dev/null
+++ b/src/libcgo/mingw_amd64.c
@@ -0,0 +1,45 @@
+// Copyright 2009 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#define WIN64_LEAN_AND_MEAN
+#include <windows.h>
+#include "libcgo.h"
+
+static void *threadentry(void*);
+
+/* From what I've read 2MB is default for 64-bit Linux. 
+   Allocation granularity on Windows is typically 64 KB. */
+#define STACKSIZE (2*1024*1024)
+
+void
+initcgo(void)
+{
+}
+
+void
+libcgo_sys_thread_start(ThreadStart *ts)
+{
+    ts->g->stackguard = STACKSIZE;
+    _beginthread(threadentry, STACKSIZE, ts);
+}
+
+static void*
+threadentry(void *v)
+{
+    ThreadStart ts;
+
+    ts = *(ThreadStart*)v;
+    free(v);
+
+    ts.g->stackbase = (uintptr)&ts;
+
+    /*
+     * libcgo_sys_thread_start set stackguard to stack size;
+     * change to actual guard pointer.
+     */
+    ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096;
+
+    crosscall_386(ts.fn);
+    return nil;
+}