add examples

examples/helloworld/main.c

@@ -0,0 +1,81 @@
+
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2014 Intel Corporation
+ */
+#include <errno.h>
+#include <rte_debug.h>
+#include <rte_eal.h>
+#include <rte_launch.h>
+#include <rte_lcore.h>
+#include <rte_memory.h>
+#include <rte_per_lcore.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/queue.h>
+#include <rte_cycles.h>
+
+static int lcore_hello(__rte_unused void *arg) {
+    unsigned lcore_id;
+    lcore_id = rte_lcore_id();
+    printf("hello from core %u\n", lcore_id);
+    return 0;
+}
+
+int main(int argc, char **argv) {
+    int socket_count;
+    int lcore_count;
+    int ret;
+    unsigned lcore_id;
+    ret = rte_eal_init(argc, argv);
+    if (ret < 0)
+        rte_panic("Cannot init EAL\n");
+
+    /* call lcore_hello() on every worker lcore */
+    RTE_LCORE_FOREACH_WORKER(lcore_id) {
+        rte_eal_remote_launch(lcore_hello, NULL, lcore_id);
+    }
+
+    /* call it on main lcore too */
+    lcore_hello(NULL);
+
+    // print socket count
+    socket_count = rte_socket_count();
+    printf("number of sockets:%i", socket_count);
+
+    // print lcore count
+    lcore_count = rte_lcore_count();
+    printf("number of lcores:%i", lcore_count);
+
+    // test timer
+    uint32_t seconds = 0;
+    uint64_t cycles_old = rte_get_tsc_cycles();
+    for (;;) {
+        uint64_t hz = rte_get_tsc_hz();
+        uint64_t cycles = rte_get_tsc_cycles();
+        uint64_t delta_cycles = cycles - cycles_old;
+
+        if (delta_cycles >= hz) {
+            ++seconds;
+            cycles_old = cycles - (delta_cycles % hz); 
+        }
+
+        printf("seconds : %u\n", seconds);
+    }
+
+    rte_eal_mp_wait_lcore();
+
+    /* clean up the EAL */
+    rte_eal_cleanup();
+    return 0;
+}
+
+uint64_t int_divide(uint64_t a, uint64_t b) {
+    uint64_t c = 0;
+    while (a >= b) {
+        a -= b;
+        ++c;
+    }
+
+    return c;
+}