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/* -*- c++ -*- */
/*
* Copyright 2003,2005,2011 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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 3, or (at your option)
* any later version.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdexcept>
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <errno.h>
#include <stdio.h>
#include <gr_pagesize.h>
#include <gr_vmcircbuf_createfilemapping.h>
#include <boost/format.hpp>
#ifdef HAVE_CREATEFILEMAPPING
// Print Windows error (could/should be global?)
static void
werror( char *where, DWORD last_error )
{
char buf[1024];
FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
last_error,
0, // default language
buf,
sizeof(buf)/sizeof(TCHAR), // buffer size
NULL );
fprintf( stderr, "%s: Error %d: %s", where, last_error, buf );
return;
}
#endif
gr_vmcircbuf_createfilemapping::gr_vmcircbuf_createfilemapping (int size)
: gr_vmcircbuf (size)
{
#if !defined(HAVE_CREATEFILEMAPPING)
fprintf (stderr, "%s: createfilemapping is not available\n",__FUNCTION__);
throw std::runtime_error ("gr_vmcircbuf_createfilemapping");
#else
static int s_seg_counter = 0;
if (size <= 0 || (size % gr_pagesize ()) != 0){
fprintf (stderr, "gr_vmcircbuf_createfilemapping: invalid size = %d\n", size);
throw std::runtime_error ("gr_vmcircbuf_createfilemapping");
}
std::string seg_name = str(boost::format("/gnuradio-%d-%d") % getpid () % s_seg_counter);
d_handle = CreateFileMapping(INVALID_HANDLE_VALUE, // use paging file
NULL, // default security
PAGE_READWRITE, // read/write access
0, // max. object size
size, // buffer size
seg_name.c_str()); // name of mapping object
s_seg_counter++;
if (d_handle == NULL || d_handle == INVALID_HANDLE_VALUE){
std::string msg = str(boost::format(
"gr_vmcircbuf_mmap_createfilemapping: CreateFileMapping [%s]") %
seg_name );
werror((char *) msg.c_str(), GetLastError() );
throw std::runtime_error ("gr_vmcircbuf_mmap_createfilemapping");
}
// Allocate virtual memory of the needed size, then free it so we can use it
LPVOID first_tmp;
first_tmp = VirtualAlloc( NULL, 2*size, MEM_RESERVE, PAGE_NOACCESS );
if (first_tmp == NULL){
werror( "gr_vmcircbuf_mmap_createfilemapping: VirtualAlloc", GetLastError());
CloseHandle(d_handle); // cleanup
throw std::runtime_error ("gr_vmcircbuf_mmap_createfilemapping");
}
if (VirtualFree(first_tmp, 0, MEM_RELEASE) == 0){
werror( "gr_vmcircbuf_mmap_createfilemapping: VirtualFree", GetLastError());
CloseHandle(d_handle); // cleanup
throw std::runtime_error ("gr_vmcircbuf_mmap_createfilemapping");
}
d_first_copy = MapViewOfFileEx((HANDLE)d_handle, // handle to map object
FILE_MAP_WRITE, // read/write permission
0,
0,
size,
first_tmp);
if (d_first_copy != first_tmp){
werror( "gr_vmcircbuf_mmap_createfilemapping: MapViewOfFileEx(1)", GetLastError());
CloseHandle(d_handle); // cleanup
throw std::runtime_error ("gr_vmcircbuf_mmap_createfilemapping");
}
d_second_copy = MapViewOfFileEx((HANDLE)d_handle, // handle to map object
FILE_MAP_WRITE, // read/write permission
0,
0,
size,
(char *)first_tmp + size);//(LPVOID) ((char *)d_first_copy + size));
if (d_second_copy != (char *)first_tmp + size){
werror( "gr_vmcircbuf_mmap_createfilemapping: MapViewOfFileEx(2)", GetLastError());
UnmapViewOfFile(d_first_copy);
CloseHandle(d_handle); // cleanup
throw std::runtime_error ("gr_vmcircbuf_mmap_createfilemapping");
}
#ifdef DEBUG
fprintf (stderr,"gr_vmcircbuf_mmap_createfilemapping: contiguous? mmap %p %p %p %p\n",
(char *)d_first_copy, (char *)d_second_copy, size, (char *)d_first_copy + size);
#endif
// Now remember the important stuff
d_base = (char *) d_first_copy;
d_size = size;
#endif /*HAVE_CREATEFILEMAPPING*/
}
gr_vmcircbuf_createfilemapping::~gr_vmcircbuf_createfilemapping ()
{
#ifdef HAVE_CREATEFILEMAPPING
if (UnmapViewOfFile(d_first_copy) == 0)
{
werror("gr_vmcircbuf_createfilemapping: UnmapViewOfFile(d_first_copy)", GetLastError());
}
d_base=NULL;
if (UnmapViewOfFile(d_second_copy) == 0)
{
werror("gr_vmcircbuf_createfilemapping: UnmapViewOfFile(d_second_copy)", GetLastError());
}
//d_second=NULL;
CloseHandle(d_handle);
#endif
}
// ----------------------------------------------------------------
// The factory interface
// ----------------------------------------------------------------
gr_vmcircbuf_factory *gr_vmcircbuf_createfilemapping_factory::s_the_factory = 0;
gr_vmcircbuf_factory *
gr_vmcircbuf_createfilemapping_factory::singleton ()
{
if (s_the_factory)
return s_the_factory;
s_the_factory = new gr_vmcircbuf_createfilemapping_factory ();
return s_the_factory;
}
int
gr_vmcircbuf_createfilemapping_factory::granularity ()
{
#ifdef HAVE_CREATEFILEMAPPING
// return 65536;//TODO, check, is this needed or can we just use gr_pagesize()
SYSTEM_INFO system_info;
GetSystemInfo(&system_info);
//fprintf(stderr,"win32 AllocationGranularity %p\n",(int)system_info.dwAllocationGranularity);
return (int)system_info.dwAllocationGranularity;
#else
return gr_pagesize ();
#endif
}
gr_vmcircbuf *
gr_vmcircbuf_createfilemapping_factory::make (int size)
{
try
{
return new gr_vmcircbuf_createfilemapping (size);
}
catch (...)
{
return 0;
}
}
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