如何判断是否为主线程？

import process from '@ohos.process'; 
  
function  isMainThread(): boolean { 
  return process.pid == process.tid 
}

#include <unistd.h> 
#include <thread> 
#include <sys/syscall.h> 
  
bool isMainThread() { 
    pid_t pid = getpid(); 
    pid_t tid = syscall(SYS_gettid); 
  
    if (pid == tid) { 
        return true; 
    } else { 
        return false; 
    } 
}