Changing it from NOCHECKS to DOCHECKS

Makefile

@@ -5,10 +5,10 @@ LIBS	= -lpthread -lrt
 all: test_mutex test_mutex_check
 
 test_mutex: test_mutex.cpp
-	$(CXX) test_mutex.cpp -o test_mutex $(CXXFLAGS) $(LIBS) -DNOCHECKS=1
+	$(CXX) test_mutex.cpp -o test_mutex $(CXXFLAGS) $(LIBS)
 
 test_mutex_check: test_mutex.cpp
-	$(CXX) test_mutex.cpp -o test_mutex_check $(CXXFLAGS) $(LIBS)
+	$(CXX) test_mutex.cpp -o test_mutex_check $(CXXFLAGS) $(LIBS) -DDOCHECKS=1
 
 clean:
 	rm -f test_mutex test_mutex_check

test_mutex.cpp

@@ -10,7 +10,7 @@
 //    NOTE: If you get linker errors about the atomic built-in functions (__sync_*),
 //          then add -march=i486 so that they will be included (not available for i386)
 //
-// Add -DNOCHECKS=1 to disable error checking.
+// Add -DDOCHECKS=1 to enable error checking.
 
 #include <semaphore.h>
 #include <pthread.h>
@@ -23,9 +23,7 @@
 #include <stdint.h>
 
 // Prehistoric error checking for brevity
-#if defined(NOCHECKS)
-#   define CHECK(condition) (void)(condition)
-#else
+#if defined(DOCHECKS)
 #   define CHECK(condition) \
         do \
         { \
@@ -36,6 +34,8 @@
             } \
         } \
         while (false)
+#else
+#   define CHECK(condition) (void)(condition)
 #endif
 
 class mutex