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/* -*- c++ -*- */
/*
* Copyright 2003,2005,2011,2013 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 <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdexcept>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include "pagesize.h"
#include "vmcircbuf_createfilemapping.h"
#include <errno.h>
#include <stdio.h>
#include <boost/format.hpp>
namespace gr {
#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
vmcircbuf_createfilemapping::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
gr::thread::scoped_lock guard(s_vm_mutex);
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*/
}
vmcircbuf_createfilemapping::~vmcircbuf_createfilemapping()
{
#ifdef HAVE_CREATEFILEMAPPING
gr::thread::scoped_lock guard(s_vm_mutex);
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* vmcircbuf_createfilemapping_factory::s_the_factory = 0;
gr::vmcircbuf_factory* vmcircbuf_createfilemapping_factory::singleton()
{
if (s_the_factory)
return s_the_factory;
s_the_factory = new vmcircbuf_createfilemapping_factory();
return s_the_factory;
}
int 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* vmcircbuf_createfilemapping_factory::make(int size)
{
try {
return new vmcircbuf_createfilemapping(size);
} catch (...) {
return 0;
}
}
} /* namespace gr */
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