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-rw-r--r--unix/tcl.m43
1 files changed, 3 insertions, 0 deletions
diff --git a/unix/tcl.m4 b/unix/tcl.m4
index 13234da..3b51c8d 100644
--- a/unix/tcl.m4
+++ b/unix/tcl.m4
@@ -365,6 +365,9 @@ AC_DEFUN(SC_ENABLE_THREADS, [
AC_MSG_RESULT(yes)
TCL_THREADS=1
AC_DEFINE(TCL_THREADS)
+ # USE_THREAD_ALLOC tells us to try the special thread-based
+ # allocator that significantly reduces lock contention
+ AC_DEFINE(USE_THREAD_ALLOC)
AC_DEFINE(_REENTRANT)
AC_DEFINE(_THREAD_SAFE)
AC_CHECK_LIB(pthread,pthread_mutex_init,tcl_ok=yes,tcl_ok=no)