在ContikiOS的RPL协议中，如何计算节点发送或转发的报文数量？

#include "sys/statistics.h"

// 初始化统计模块
statistics_init();

// 在发送或转发报文时增加计数
STATS_INC(send_packet_count);
STATS_INC(forward_packet_count);

// 查询发送或转发的报文数量
uint32_t send_count = STATS_READ(send_packet_count);
uint32_t forward_count = STATS_READ(forward_packet_count);

#include <stdio.h>

// 定义全局计数器
static uint32_t send_packet_counter = 0;
static uint32_t forward_packet_counter = 0;

// 发送报文时增加计数
void send_packet(void) {
    // 发送报文的逻辑
    send_packet_counter++;
}

// 转发报文时增加计数
void forward_packet(void) {
    // 转发报文的逻辑
    forward_packet_counter++;
}

// 查询发送或转发的报文数量
void print_packet_counts(void) {
    printf("Send Packet Count: %u\n", send_packet_counter);
    printf("Forward Packet Count: %u\n", forward_packet_counter);
}

static uint64_t send_packet_counter = 0;
static uint64_t forward_packet_counter = 0;

#include <pthread.h>

static pthread_mutex_t counter_mutex = PTHREAD_MUTEX_INITIALIZER;

void send_packet(void) {
    pthread_mutex_lock(&counter_mutex);
    send_packet_counter++;
    pthread_mutex_unlock(&counter_mutex);
}

void forward_packet(void) {
    pthread_mutex_lock(&counter_mutex);
    forward_packet_counter++;
    pthread_mutex_unlock(&counter_mutex);
}