shm_unlink.cc

简单的动态内存管理程序源代码

// file: shm_unlink.cc
// author: Marc Bumble
// April 29, 2003
// Page memory source for shared memory 
// Copyright (C) 2003 by Marc D. Bumble

//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 2
//  of the License, or (at your option) any later version.

//  This program 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 General Public License for more details.

//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

extern "C" {
  // #include <sys/types.h>
#include <unistd.h>  /* POSIX et al */
#include <sys/mman.h>
#include <fcntl.h>     // for O_RDWR | O_CREAT | O_TRUNC
}

#include <iostream>  
#include <fstream>  // for std::ofstream to()
#include <sstream>		// string stream for stringstream

#include <pooled_allocator.h>

char  key_val_1[] = "/allocate_key";  // needs a leading slash, see manpage.
char  key_val_2[] = "/allocate_key2";  // used in Pool test

int main(int argc, char** argv) {

  for (int proj_id=0; proj_id <=5; proj_id++) {
    // create the shared segment key
    std::stringstream alloc_key_ss;
    alloc_key_ss << key_val_1 << "_" << proj_id;
    // unlink shared memory
    int result = shm_unlink(alloc_key_ss.str().data());
    //     if (errno!=ENOENT) {
    if (!result) {
      std::clog << "shm_unlink released " << alloc_key_ss.str() << std::endl;
      std::clog << "Status: " << __FILE__ << ':' << __LINE__ ;
      std::clog << ": shared memory shm_unlink: " << strerror(errno) <<
	":  " << alloc_key_ss.str().data() << std::endl;
    }
  }  // for (int i=0; i <=127; i++)
  for (int proj_id=0; proj_id <=5; proj_id++) {
    // create the shared segment key
    std::stringstream alloc_key_ss;
    alloc_key_ss << key_val_2 << "_" << proj_id;
    // unlink shared memory
    int result = shm_unlink(alloc_key_ss.str().data());
    //     if (errno!=ENOENT) {
    if (!result) {
      std::clog << "shm_unlink released " << alloc_key_ss.str() << std::endl;
      std::clog << "Status: " << __FILE__ << ':' << __LINE__ ;
      std::clog << ": shared memory shm_unlink: " << strerror(errno) <<
	":  " << alloc_key_ss.str().data() << std::endl;
    }
  }  // for (int i=0; i <=127; i++)

  
  
  return 0;

}