added C version of simple_example

examples/simple_example.c

@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+#include "rocksdb/c.h"
+
+#include <unistd.h>	// sysconf() - get CPU count
+
+char DBPath[] = "/tmp/rocksdb_simple_example";
+
+int main (int argc, char **argv) {
+	rocksdb_t *db;
+	rocksdb_options_t *options = rocksdb_options_create ();
+	// Optimize RocksDB. This is the easiest way to get RocksDB to perform well
+	int cpus = sysconf (_SC_NPROCESSORS_ONLN);	// get number of online cores
+	rocksdb_options_increase_parallelism (options, cpus);
+	rocksdb_options_optimize_level_style_compaction (options, 0);
+	// create the DB if it's not already present
+	rocksdb_options_set_create_if_missing (options, 1);
+
+	// open DB
+	char *err;
+	db = rocksdb_open (options, DBPath, &err);
+//	assert (!err);
+
+	// Put key-value
+	rocksdb_writeoptions_t *writeoptions = rocksdb_writeoptions_create ();
+	const char key[] = "key";
+	char *value = "value";
+	rocksdb_put (db, writeoptions, key, strlen (key), value, strlen (value), &err);
+//	assert (!err);
+	// Get value
+	rocksdb_readoptions_t *readoptions = rocksdb_readoptions_create ();
+	size_t len;
+	value = rocksdb_get (db, readoptions, key, strlen (key), &len, &err);
+//	assert (!err);
+	assert (strcmp (value, "value") == 0);
+
+	rocksdb_close (db);
+
+	return 0;
+}