AC_DEFINE([USE_UNLOCKED_IO], 1,
[Define to 1 if you want getc etc. to use unlocked I/O if available.
Unlocked I/O can improve performance in unithreaded apps,
AC_DEFINE([USE_UNLOCKED_IO], 1,
[Define to 1 if you want getc etc. to use unlocked I/O if available.
Unlocked I/O can improve performance in unithreaded apps,