Tim Mayberry
6262eae7c0
git-svn-id: svn://localhost/ardour2/branches/3.0@12827 d708f5d6-7413-0410-9779-e7cbd77b26cf
318 lines
6.4 KiB
C++
318 lines
6.4 KiB
C++
/*
|
|
Copyright (C) 2010 Paul Davis
|
|
|
|
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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
*/
|
|
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <cassert>
|
|
#include <cstdio>
|
|
|
|
#ifdef __APPLE__
|
|
#include <mach/mach_time.h>
|
|
#endif
|
|
|
|
#include "pbd/compose.h"
|
|
#include "pbd/file_manager.h"
|
|
#include "pbd/debug.h"
|
|
|
|
using namespace std;
|
|
using namespace PBD;
|
|
|
|
FileManager* FileDescriptor::_manager;
|
|
|
|
FileManager::FileManager ()
|
|
: _open (0)
|
|
{
|
|
struct rlimit rl;
|
|
int const r = getrlimit (RLIMIT_NOFILE, &rl);
|
|
|
|
/* XXX: this is a bit arbitrary */
|
|
if (r == 0) {
|
|
_max_open = rl.rlim_cur - 64;
|
|
} else {
|
|
_max_open = 256;
|
|
}
|
|
|
|
DEBUG_TRACE (DEBUG::FileManager, string_compose ("FileManager can open up to %1 files.\n", _max_open));
|
|
}
|
|
|
|
void
|
|
FileManager::add (FileDescriptor* d)
|
|
{
|
|
Glib::Mutex::Lock lm (_mutex);
|
|
_files.push_back (d);
|
|
}
|
|
|
|
/** @return true on error, otherwise false */
|
|
bool
|
|
FileManager::allocate (FileDescriptor* d)
|
|
{
|
|
Glib::Mutex::Lock lm (_mutex);
|
|
|
|
if (!d->is_open()) {
|
|
|
|
/* this file needs to be opened */
|
|
|
|
if (_open == _max_open) {
|
|
|
|
/* We already have the maximum allowed number of files opened, so we must try to close one.
|
|
Find the unallocated, open file with the lowest last_used time.
|
|
*/
|
|
|
|
double lowest_last_used = DBL_MAX;
|
|
list<FileDescriptor*>::iterator oldest = _files.end ();
|
|
|
|
for (list<FileDescriptor*>::iterator i = _files.begin(); i != _files.end(); ++i) {
|
|
if ((*i)->is_open() && (*i)->_refcount == 0) {
|
|
if ((*i)->_last_used < lowest_last_used) {
|
|
lowest_last_used = (*i)->_last_used;
|
|
oldest = i;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (oldest == _files.end()) {
|
|
/* no unallocated and open files exist, so there's nothing we can do */
|
|
return true;
|
|
}
|
|
|
|
close (*oldest);
|
|
DEBUG_TRACE (
|
|
DEBUG::FileManager,
|
|
string_compose (
|
|
"closed file for %1 to release file handle; now have %2 of %3 open\n",
|
|
(*oldest)->_path, _open, _max_open
|
|
)
|
|
);
|
|
}
|
|
|
|
if (d->open ()) {
|
|
DEBUG_TRACE (DEBUG::FileManager, string_compose ("open of %1 failed.\n", d->_path));
|
|
return true;
|
|
}
|
|
|
|
_open++;
|
|
|
|
DEBUG_TRACE (DEBUG::FileManager, string_compose ("opened file for %1; now have %2 of %3 open.\n", d->_path, _open, _max_open));
|
|
}
|
|
|
|
#ifdef __APPLE__
|
|
d->_last_used = mach_absolute_time();
|
|
#else
|
|
struct timespec t;
|
|
clock_gettime (CLOCK_MONOTONIC, &t);
|
|
d->_last_used = t.tv_sec + (double) t.tv_nsec / 10e9;
|
|
#endif
|
|
|
|
d->_refcount++;
|
|
|
|
return false;
|
|
}
|
|
|
|
/** Tell FileManager that a FileDescriptor is no longer needed for a given handle */
|
|
void
|
|
FileManager::release (FileDescriptor* d)
|
|
{
|
|
Glib::Mutex::Lock lm (_mutex);
|
|
|
|
d->_refcount--;
|
|
assert (d->_refcount >= 0);
|
|
}
|
|
|
|
/** Remove a file from our lists. It will be closed if it is currently open. */
|
|
void
|
|
FileManager::remove (FileDescriptor* d)
|
|
{
|
|
Glib::Mutex::Lock lm (_mutex);
|
|
|
|
if (d->is_open ()) {
|
|
close (d);
|
|
DEBUG_TRACE (
|
|
DEBUG::FileManager,
|
|
string_compose ("closed file for %1; file is being removed; now have %2 of %3 open\n", d->_path, _open, _max_open)
|
|
);
|
|
}
|
|
|
|
_files.remove (d);
|
|
}
|
|
|
|
void
|
|
FileManager::close (FileDescriptor* d)
|
|
{
|
|
/* we must have a lock on our mutex */
|
|
|
|
d->close ();
|
|
d->Closed (); /* EMIT SIGNAL */
|
|
_open--;
|
|
}
|
|
|
|
FileDescriptor::FileDescriptor (string const & n, bool w)
|
|
: _refcount (0)
|
|
, _last_used (0)
|
|
, _path (n)
|
|
, _writeable (w)
|
|
{
|
|
|
|
}
|
|
|
|
FileManager*
|
|
FileDescriptor::manager ()
|
|
{
|
|
if (_manager == 0) {
|
|
_manager = new FileManager;
|
|
}
|
|
|
|
return _manager;
|
|
}
|
|
|
|
/** Release a previously allocated handle to this file */
|
|
void
|
|
FileDescriptor::release ()
|
|
{
|
|
manager()->release (this);
|
|
}
|
|
|
|
|
|
|
|
/** @param file_name Filename.
|
|
* @param writeable true to open writeable, otherwise false.
|
|
* @param mode Open mode for the file.
|
|
*/
|
|
|
|
FdFileDescriptor::FdFileDescriptor (string const & file_name, bool writeable, mode_t mode)
|
|
: FileDescriptor (file_name, writeable)
|
|
, _fd (-1)
|
|
, _mode (mode)
|
|
{
|
|
manager()->add (this);
|
|
}
|
|
|
|
FdFileDescriptor::~FdFileDescriptor ()
|
|
{
|
|
manager()->remove (this);
|
|
}
|
|
|
|
bool
|
|
FdFileDescriptor::is_open () const
|
|
{
|
|
/* we must have a lock on the FileManager's mutex */
|
|
|
|
return _fd != -1;
|
|
}
|
|
|
|
bool
|
|
FdFileDescriptor::open ()
|
|
{
|
|
/* we must have a lock on the FileManager's mutex */
|
|
|
|
_fd = ::open (_path.c_str(), _writeable ? (O_RDWR | O_CREAT) : O_RDONLY, _mode);
|
|
return (_fd == -1);
|
|
}
|
|
|
|
void
|
|
FdFileDescriptor::close ()
|
|
{
|
|
/* we must have a lock on the FileManager's mutex */
|
|
|
|
::close (_fd);
|
|
_fd = -1;
|
|
}
|
|
|
|
/** @return fd, or -1 on error */
|
|
int
|
|
FdFileDescriptor::allocate ()
|
|
{
|
|
bool const f = manager()->allocate (this);
|
|
if (f) {
|
|
return -1;
|
|
}
|
|
|
|
/* this is ok thread-wise because allocate () has incremented
|
|
the Descriptor's refcount, so the file will not be closed
|
|
*/
|
|
return _fd;
|
|
}
|
|
|
|
|
|
void
|
|
FileDescriptor::set_path (const string& p)
|
|
{
|
|
_path = p;
|
|
}
|
|
|
|
/** @param file_name Filename.
|
|
* @param mode Mode to pass to fopen.
|
|
*/
|
|
|
|
StdioFileDescriptor::StdioFileDescriptor (string const & file_name, std::string const & mode)
|
|
: FileDescriptor (file_name, false)
|
|
, _file (0)
|
|
, _mode (mode)
|
|
{
|
|
manager()->add (this);
|
|
}
|
|
|
|
StdioFileDescriptor::~StdioFileDescriptor ()
|
|
{
|
|
manager()->remove (this);
|
|
}
|
|
|
|
bool
|
|
StdioFileDescriptor::is_open () const
|
|
{
|
|
/* we must have a lock on the FileManager's mutex */
|
|
|
|
return _file != 0;
|
|
}
|
|
|
|
bool
|
|
StdioFileDescriptor::open ()
|
|
{
|
|
/* we must have a lock on the FileManager's mutex */
|
|
|
|
_file = fopen (_path.c_str(), _mode.c_str());
|
|
return (_file == 0);
|
|
}
|
|
|
|
void
|
|
StdioFileDescriptor::close ()
|
|
{
|
|
/* we must have a lock on the FileManager's mutex */
|
|
|
|
fclose (_file);
|
|
_file = 0;
|
|
}
|
|
|
|
/** @return FILE*, or 0 on error */
|
|
FILE*
|
|
StdioFileDescriptor::allocate ()
|
|
{
|
|
bool const f = manager()->allocate (this);
|
|
if (f) {
|
|
return 0;
|
|
}
|
|
|
|
/* this is ok thread-wise because allocate () has incremented
|
|
the Descriptor's refcount, so the file will not be closed
|
|
*/
|
|
return _file;
|
|
}
|