C++ timer execute function in interval time span

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#include <iostream>
#include <chrono>
#include <thread>
#include <functional>
#include <uuid/uuid.h>

using namespace std;

static char *dtValue=(char*)malloc(20);
static char *uuidValue = (char *)malloc(40);
static int num=0;
char *getTimeNow();
char *getUuid3();

void timerStart(function<void(void)> func,unsigned int interval)
{
    thread([func,interval](){
        while(true)
        {
            func();
            this_thread::sleep_for(std::chrono::milliseconds(interval));
        }
    }).detach();
}

void printTimeNow()
{
   cout<<"Now is "<<getTimeNow()<<",and uuid ="<<getUuid3()<<endl;    
}

char *getTimeNow()
{
    time_t rawTime = time(NULL);
    struct tm tmInfo = *localtime(&rawTime);
    strftime(dtValue, 20, "%Y%m%d%H%M%S", &tmInfo);
    return dtValue;
}

char *getUuid3()
{
    uuid_t newUUID;
    uuid_generate(newUUID);
    uuid_unparse(newUUID, uuidValue);
    return uuidValue;
}

int main()
{
    timerStart(printTimeNow,2000);
    while(1);
}

int main()
{
    while(1)
    {
        printTimeNow();
        this_thread::sleep_for(chrono::milliseconds(1000));
    } 
}

Compile:

g++ -g h2.cpp -o h2 -lpthread -luuid

Run ./h2

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