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/*********************************************************************/
// libthreadar - is a library providing several C++ classes to work with threads
// Copyright (C) 2014-2024 Denis Corbin
//
// This file is part of libthreadar package
//
// libthreadar is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// libhtreadar is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with libthreadar. If not, see <http://www.gnu.org/licenses/>
//
//----
// to contact the author: dar.linux@free.fr
/*********************************************************************/
extern "C"
{
#include <unistd.h>
#include <fcntl.h>
}
#include <iostream>
#include "../../src/libthreadar.hpp"
size_t get_default_stack_size();
void read_proc_self_maps(const std::string & context);
class my_thread: public libthreadar::thread_signal
{
protected:
virtual void inherited_run() override
{
std::cout << "default thread size reported get_stacksize() from within thread: " << get_default_stack_size() << std::endl;
read_proc_self_maps("in a thread");
};
};
void read_proc_self_maps(const std::string & context)
{
static const unsigned int buf_size = 1024*1024;
int fd = open("/proc/self/maps", O_RDONLY);
char buf[buf_size];
int lu = 0;
std::cout << " --------------------- " << context << " [START]" << std::endl;
if(fd < 0)
return;
try
{
do
{
lu = read(fd, buf, buf_size);
if(lu > 0)
{
buf[lu] = '\0';
std::cout << buf << std::flush;
}
}
while(lu > 0);
}
catch(...)
{
close(fd);
throw;
}
close(fd);
std::cout << " --------------------- " << context << " [END]" << std::endl;
}
size_t get_default_stack_size()
{
size_t ret = 0;
pthread_attr_t attr;
switch(pthread_attr_init(&attr))
{
case 0:
break;
default:
return 0;
}
pthread_attr_getstacksize(&attr,
&ret);
pthread_attr_destroy(&attr);
return ret;
}
int main()
{
my_thread t1;
std::cout << "default stack size is: " << get_default_stack_size() << std::endl;
read_proc_self_maps("in main thread");
t1.run();
t1.join();
t1.set_stack_size(4*1024*1024);
t1.run();
t1.join();
}
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