Eo: add benchmarks to measure eo_add.

The first one checks simple objects creation.
The second one creates objects, removes half of them and creates the same number.

src/benchmarks/eo/Makefile.am

@@ -17,7 +17,8 @@ class_simple.c \
 class_simple.h \
 eo_bench.c \
 eo_bench.h \
-eo_bench_eo_do.c
+eo_bench_eo_do.c \
+eo_bench_eo_add.c
 
 eo_bench_LDADD = \
 $(top_builddir)/src/lib/eo/libeo.la \

src/benchmarks/eo/eo_bench.c

@@ -20,6 +20,7 @@ struct _Eina_Benchmark_Case
 
 static const Eina_Benchmark_Case etc[] = {
    { "eo_do", eo_bench_eo_do },
+   { "eo_add", eo_bench_eo_add },
    { NULL, NULL }
 };
 

src/benchmarks/eo/eo_bench.h

@@ -2,5 +2,6 @@
 #define EINA_BENCH_H_
 
 void eo_bench_eo_do(Eina_Benchmark *bench);
+void eo_bench_eo_add(Eina_Benchmark *bench);
 
 #endif

src/benchmarks/eo/eo_bench_eo_add.c

@@ -0,0 +1,47 @@
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "Eo.h"
+#include "eo_bench.h"
+#include "class_simple.h"
+
+static void
+bench_eo_add_linear(int request)
+{
+   int i;
+   Eo **objs = calloc(request, sizeof(Eo *));
+   for (i = 0 ; i < request ; i++)
+      objs[i] = eo_add(SIMPLE_CLASS, NULL);
+
+   for (i = 0 ; i < request ; i++)
+      eo_unref(objs[i]);
+   free(objs);
+}
+
+static void
+bench_eo_add_jump_by_2(int request)
+{
+   int i;
+   Eo **objs = calloc(request, sizeof(Eo *));
+   for (i = 0 ; i < request ; i++)
+      objs[i] = eo_add(SIMPLE_CLASS, NULL);
+
+   for (i = 0 ; i < request ; i += 2)
+      eo_unref(objs[i]);
+
+   for (i = 0 ; i < request ; i += 2)
+      objs[i] = eo_add(SIMPLE_CLASS, NULL);
+
+   for (i = 0 ; i < request ; i++)
+      eo_unref(objs[i]);
+   free(objs);
+}
+
+void eo_bench_eo_add(Eina_Benchmark *bench)
+{
+   eina_benchmark_register(bench, "eo_add_linear",
+         EINA_BENCHMARK(bench_eo_add_linear), 1000, 50000, 100);
+   eina_benchmark_register(bench, "eo_add_jump_by_2",
+         EINA_BENCHMARK(bench_eo_add_jump_by_2), 1000, 50000, 100);
+}