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-rw-r--r--thread_win32.h10
1 files changed, 7 insertions, 3 deletions
diff --git a/thread_win32.h b/thread_win32.h
index c02e406795..5a88fb40f8 100644
--- a/thread_win32.h
+++ b/thread_win32.h
@@ -10,11 +10,15 @@
**********************************************************************/
/* interface */
-#ifndef THREAD_WIN32_H_INCLUDED
-#define THREAD_WIN32_H_INCLUDED
+#ifndef RUBY_THREAD_WIN32_H
+#define RUBY_THREAD_WIN32_H
#include <windows.h>
+# ifdef __CYGWIN__
+# undef _WIN32
+# endif
+
WINBASEAPI BOOL WINAPI
TryEnterCriticalSection(IN OUT LPCRITICAL_SECTION lpCriticalSection);
@@ -30,5 +34,5 @@ typedef struct native_thread_data_struct {
HANDLE interrupt_event;
} native_thread_data_t;
-#endif /* THREAD_WIN32_H_INCLUDED */
+#endif /* RUBY_THREAD_WIN32_H */