flint: add context switch benchmark

tests/test_benchmark.c

@@ -0,0 +1,49 @@
+
+/*
+ * machinarium.
+ *
+ * Cooperative multitasking engine.
+*/
+
+/*
+ * This example shows fiber context switch (yield)
+ * performance done in one second.
+*/
+
+#include <machinarium.h>
+
+static int csw = 0;
+
+static void
+benchmark_worker(void *arg)
+{
+	mm_t env = arg;
+	printf("worker started.\n");
+	while (mm_is_online(env)) {
+		csw++;
+		mm_sleep(env, 0);
+	}
+	printf("worker done.\n");
+}
+
+static void
+benchmark_runner(void *arg)
+{
+	mm_t env = arg;
+	printf("benchmark started.\n");
+	mm_create(env, benchmark_worker, env);
+	mm_sleep(env, 1000);
+	printf("done.\n");
+	printf("context switches %d in 1 sec.\n", csw);
+	mm_stop(env);
+}
+
+int
+main(int argc, char *argv[])
+{
+	mm_t env = mm_new();
+	mm_create(env, benchmark_runner, env);
+	mm_start(env);
+	mm_free(env);
+	return 0;
+}