Don't use atomic add for not critical statistics.

include/my_pthread.h

@@ -669,8 +669,6 @@ extern pthread_t shutdown_th, main_th, signal_th;
 #define thread_safe_increment(V,L) atomic_add(1,(atomic_t*) &V);
 #define thread_safe_add(V,C,L)     atomic_add((C),(atomic_t*) &V);
 #define thread_safe_sub(V,C,L)     atomic_sub((C),(atomic_t*) &V);
-#define statistic_increment(V,L)   thread_safe_increment((V),(L))
-#define statistic_add(V,C,L)       thread_safe_add((V),(C),(L))
 #else
 #define thread_safe_increment(V,L) \
 	pthread_mutex_lock((L)); (V)++; pthread_mutex_unlock((L));
@@ -678,6 +676,7 @@ extern pthread_t shutdown_th, main_th, signal_th;
 	pthread_mutex_lock((L)); (V)+=(C); pthread_mutex_unlock((L));
 #define thread_safe_sub(V,C,L) \
 	pthread_mutex_lock((L)); (V)-=(C); pthread_mutex_unlock((L));
+#endif /* HAVE_ATOMIC_ADD */
 #ifdef SAFE_STATISTICS
 #define statistic_increment(V,L)   thread_safe_increment((V),(L))
 #define statistic_add(V,C,L)       thread_safe_add((V),(C),(L))
@@ -685,7 +684,6 @@ extern pthread_t shutdown_th, main_th, signal_th;
 #define statistic_increment(V,L) (V)++
 #define statistic_add(V,C,L)     (V)+=(C)
 #endif /* SAFE_STATISTICS */
-#endif /* HAVE_ATOMIC_ADD */
 #endif /* thread_safe_increment */
 
 #ifdef  __cplusplus