Allegro 5，保持控制台焦点

如何解决Allegro 5，保持控制台焦点

我正在运行Allegro 5测试代码段（如下所示）。它可以编译并运行良好，但是我想查看控制台输出（在这种情况下只是一个愚蠢的递增数字），但是Allegro切换到其他Z-Order对象...

这是C ++代码。

#include <allegro5/allegro.h>
#include <allegro5/allegro_audio.h>
#include <allegro5/allegro_acodec.h>
#include <iostream>       // std::std::cout
#include <thread>         // std::thread
#include <unistd.h>
#include <mutex>          // std::mutex
#include <cstdio>
std::mutex mtx; //mutex for critical section

int play_audio()
{
    if (!al_init()) {
        return 1;
    }
    if (!al_install_audio()) {
        return 2;
    }
    if (!al_init_acodec_addon()) {
        return 3;
    }
    if (!al_reserve_samples(1)) {
        return 4;
    }
    set_display_switch_mode(SWITCH_PAUSE);
    ALLEGRO_SAMPLE *idle_sound = al_load_sample("leaving.wav");
    ALLEGRO_SAMPLE_INSTANCE *sample_instance = al_create_sample_instance(idle_sound);
    if (!idle_sound || !sample_instance) {
        printf("Setup error.\n");
        return 5;
    }
    ALLEGRO_SAMPLE_ID sample_id;

    mtx.lock();
    if (!al_play_sample(idle_sound,1.0,0.0,ALLEGRO_PLAYMODE_ONCE,&sample_id)) {
        printf("Failed to play sample.\n");
    }
    if (!al_play_sample_instance(sample_instance)) {
        printf("Failed to play sample instance.\n");
    }
    al_rest(5.0);

    al_destroy_sample_instance(sample_instance);
    al_destroy_sample(idle_sound);
    std::cout << "Thread I have finished" << std::endl;
    mtx.unlock();
    return 1;
}


int main   (int argc,char **argv)
{
    int n = 1;

    printf("creating thread\n ");
    std::thread t_audio(play_audio);
    sleep(1);
    while (!mtx.try_lock()) {
        // Still can not lock this mutex
        printf("N is %d\n",n);
        n += 1;
        sleep(1);
    }
    // Ha ha ... we locked it - the other code must be done
    t_audio.join();
    mtx.unlock();
    printf("Main closing\n");
    printf("All done... Closing\n");
    return (0);
}

我是这样建造的

Makefile

obj =  allegro audio2
CPPFLAGS += -I/usr/local/include
LDFLAGS += -L/usr/local/lib
LDLIBS += -lallegro
LDLIBS += -lallegro_main
LDLIBS += -lallegro_audio
LDLIBS += -lallegro_acodec

.PHONY: all
all : $(obj)

.PHONE: clean
clean:
        rm -f $(obj)


allegro: allegro.cpp

audio2: audio2.cpp

运行时...控制台屏幕将输出我期望的结果...

creating thread
 N is 1
N is 2
N is 3
N is 4
N is 5
Thread I have finished
Main closing
All done... Closing

但是我需要将Tab键重新回到终端机/控制台-有什么办法可以让我保持专注吗？