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-rw-r--r--include/libio.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/libio.h b/include/libio.h
index ee727e2..633ee51 100644
--- a/include/libio.h
+++ b/include/libio.h
@@ -10,4 +10,15 @@ libc_hidden_proto (__woverflow)
libc_hidden_proto (__wunderflow)
libc_hidden_proto (__wuflow)
+#if defined _IO_MTSAFE_IO && _IO_lock_inexpensive
+# undef _IO_flockfile
+# define _IO_flockfile(_fp) \
+ if (((_fp)->_flags & _IO_USER_LOCK) == 0) \
+ _IO_lock_lock (*(_fp)->_lock)
+# undef _IO_funlockfile
+# define _IO_funlockfile(_fp) \
+ if (((_fp)->_flags & _IO_USER_LOCK) == 0) \
+ _IO_lock_unlock (*(_fp)->_lock)
+#endif
+
#endif