QNX平台上如何获取CPU使用率

在QNX平台上，为了确保系统性能和稳定性，需要监控CPU使用率。本示例代码展示了如何在QNX上获取CPU使用率。

#include <stdio.h>
#include <unistd.h>
#include <sys/neutrino.h>

int main() {
    int pid = getpid();
    int cpuid = _NTO_TCTL_IO_PRIV;
    uint64_t last_time = ClockCycles();
    uint64_t last_sys_time, last_user_time;
    uint64_t sys_time, user_time;

    // 获取初始时间和系统时间
    ThreadCtl(_NTO_TCTL_IO, &cpuid);
    ThreadCtl(_NTO_TCTL_RUNMASK, NULL);
    ThreadCtl(_NTO_TCTL_CPULOADAVG, NULL);
    SYSPAGE_ENTRY(qtime)->cycles_per_sec = SYSPAGE_ENTRY(qtime)->cycles_per_sec;

    last_sys_time = qtime().stime;
    last_user_time = qtime().utime;

    // 更新时间和系统时间直到程序退出
    while (1) {
        sys_time = qtime().stime;
        user_time = qtime().utime;
        uint64_t time = ClockCycles();
        uint64_t delta_time = time - last_time;
        uint64_t delta_sys_time = sys_time - last_sys_time;
        uint64_t delta_user_time = user_time - last_user_time;
        float cpu_load = (delta_sys_time + delta_user_time) / (float)delta_time;
        printf("CPU使用率：%.2f %%\n", cpu_load * 100);

        last_time = time;
        last_sys_time = sys_time;
        last_user_time = user_time;
        sleep(1);
    }

    return 0;
}

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