C++ 使用定时器和信号代替睡眠c/c++；

我正在编写多线程代码，其中线程必须在特定时间内休眠。我不想浪费CPU周期，我想/不得不使用计时器。这或多或少是我想要实现的

我的单线程代码似乎运行良好

#include <cstdlib>
#include <iostream>
#include <time.h>
#include <sys/siginfo.h>
#include <signal.h>
#include <unistd.h>

volatile sig_atomic_t print_flag = false;

void handle_alarm(int sig)
{
    print_flag = true;
}

int main(int argc, char *argv[])
{
    //struct sigevent event;


    signal( SIGALRM, handle_alarm ); // Install handler first,

    timer_t timerid;
    struct itimerspec timer;

    timer_create(CLOCK_REALTIME,NULL,&timerid);

    timer.it_value.tv_sec = 1;
    timer.it_value.tv_nsec = 0;
    timer.it_interval.tv_sec = 0;
    timer.it_interval.tv_sec = 0;

    std::cout << "Setting timer" << std::endl;

    timer_settime(timerid,0,&timer,NULL);

    pause();

    std::cout << "Hello\n" << std::endl;

    return EXIT_SUCCESS;
}

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易失性信号原子打印标志=false；
无效句柄_报警（int sig）
{
print_flag=true；
}
int main（int argc，char*argv[]）
{
//结构sigevent事件；
信号（信号，处理报警）；//首先安装处理程序，
计时器\u t timerid；
结构itimerspec定时器；
计时器\u创建（时钟\u实时、空和timerid）；
timer.it_value.tv_sec=1；
timer.it_value.tv_nsec=0；
timer.it_interval.tv_sec=0；
timer.it_interval.tv_sec=0；
我是这样做的

struct sigevent         event;
struct itimerspec       itime;
timer_t                 timer_id;
int                     chid, rcvid;
my_message_t            msg;

chid = ChannelCreate(0);

// following code is used to get kick every pulse period time
// which is 20ms
event.sigev_notify = SIGEV_PULSE;
event.sigev_coid = ConnectAttach(ND_LOCAL_NODE, 0,
        chid,
        _NTO_SIDE_CHANNEL, 0);
event.sigev_priority = getprio(0);
event.sigev_code = _PULSE_CODE_MINAVAIL;
timer_create(CLOCK_REALTIME, &event, &timer_id);

// 20 ms to nano seconds
itime.it_value.tv_sec = 0;
itime.it_value.tv_nsec = 20000000;
itime.it_interval.tv_sec = 0;
itime.it_interval.tv_nsec = 20000000;
timer_settime(timer_id, 0, &itime, NULL);

SERVO1DELAY1.tv_sec = 0;
SERVO1DELAY1.tv_nsec = 100000;

while(1)
{
    rcvid = MsgReceive(chid, &msg, sizeof(msg), NULL);
    if (rcvid == 0)
    {
        // make pulse high for appropriate time
        out8( data_handle_A, HIGH );
        InterruptDisable();
        nanospin(&SERVO1DELAY1);
        InterruptEnable();
        out8( data_handle_A, LOW );
    }
}

在多线程程序中使用信号时要小心，信号被传递到进程，而您不知道哪个线程将实际捕获信号。若要仅在特定线程中接收信号，所有其他线程都应阻止该信号。请阅读有关该信号的详细信息。因此，在本例中，只有thread2接收到信号（因为它上次安装了处理程序），而另一个永远暂停，依次阻塞主线程。
struct sigevent         event;
struct itimerspec       itime;
timer_t                 timer_id;
int                     chid, rcvid;
my_message_t            msg;

chid = ChannelCreate(0);

// following code is used to get kick every pulse period time
// which is 20ms
event.sigev_notify = SIGEV_PULSE;
event.sigev_coid = ConnectAttach(ND_LOCAL_NODE, 0,
        chid,
        _NTO_SIDE_CHANNEL, 0);
event.sigev_priority = getprio(0);
event.sigev_code = _PULSE_CODE_MINAVAIL;
timer_create(CLOCK_REALTIME, &event, &timer_id);

// 20 ms to nano seconds
itime.it_value.tv_sec = 0;
itime.it_value.tv_nsec = 20000000;
itime.it_interval.tv_sec = 0;
itime.it_interval.tv_nsec = 20000000;
timer_settime(timer_id, 0, &itime, NULL);

SERVO1DELAY1.tv_sec = 0;
SERVO1DELAY1.tv_nsec = 100000;

while(1)
{
    rcvid = MsgReceive(chid, &msg, sizeof(msg), NULL);
    if (rcvid == 0)
    {
        // make pulse high for appropriate time
        out8( data_handle_A, HIGH );
        InterruptDisable();
        nanospin(&SERVO1DELAY1);
        InterruptEnable();
        out8( data_handle_A, LOW );
    }
}