gdb实用知识及命令_gdb -p

常用调试方式
1.gdb 文件名
2.gdb -p 进程号
附加到进程调试，按Ctrl+c，向进程发送**SIGINT（终端终端符）**信号，所有线程被停住，所以会对线上正在运行的程序有影响。

查看所有线程调用栈：
thread apply all bt
调式代码：

#include <thread>         // std::thread
#include <chrono>
double i = 0.1;
void thread3()
{
        while(1){
                i+=1;
 //     this_thread::sleep_for (chrono::milliseconds(2));
                i+=2;
                i-=1;
        }
}
void foo()
{
  // do stuff...
  while(1){
        cout << "thread11" << endl;
        this_thread::sleep_for (chrono::seconds(2));
  }
}
void bar(int x)
{
// do stuff...
  while(1){
        cout << "thread2 " << endl;
        this_thread::sleep_for (chrono::seconds(2));
  }
}
int main()
{
  std::thread first (foo);     // spawn new thread that calls foo()
  std::thread second (bar,0);  // spawn new thread that calls bar(0)
  std::thread third(thread3);
  std::cout << "main, foo and bar now execute concurrently...\n";
  // synchronize threads:
  first.join();                // pauses until first finishes
  second.join();               // pauses until second finishes
  std::cout << "foo and bar completed.\n";
  return 0;
}
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编译命令：
g++ -std=c++11 -g gdb_t.cpp -o g -lpthread

调式core文件