mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-15 04:31:49 +08:00
2a00e4fb8e
* descriptors.cc: New file. * descriptors.h: New file. * gold-threads.h (class Hold_optional_lock): New class. * fileread.cc: Include "descriptors.h". (File_read::~File_read): Release descriptor rather than closing it. (File_read::open) [file]: Call open_descriptor rather than open. Set is_descriptor_opened_. (File_read::open) [memory]: Assert that descriptor is not open. (File_read::reopen_descriptor): New function. (File_read::release): Release descriptor. (File_read::do_read): Make non-const. Reopen descriptor. (File_read::read): Make non-const. (File_read::make_view): Reopen descriptor. (File_read::do_readv): Likewise. * fileread.h (class File_read): Add is_descriptor_opened_ field. Update declarations. * layout.cc: Include "descriptors.h". (Layout::create_build_id): Use open_descriptor rather than open. * output.cc: Include "descriptors.h". (Output_file::open): Use open_descriptor rather than open. * archive.cc (Archive::const_iterator): Change Archive to be non-const. (Archive::begin, Archive::end): Make non-const. (Archive::count_members): Likewise. * archive.h (class Archive): Update declarations. * object.h (Object::read): Make non-const. * Makefile.am (CCFILES): Add descriptors.cc. (HFILES): Add descriptors.h. * Makefile.in: Rebuild.
106 lines
3.3 KiB
C++
106 lines
3.3 KiB
C++
// descriptors.h -- manage file descriptors for gold -*- C++ -*-
|
|
|
|
// Copyright 2008 Free Software Foundation, Inc.
|
|
// Written by Ian Lance Taylor <iant@google.com>.
|
|
|
|
// This file is part of gold.
|
|
|
|
// 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
|
|
// MA 02110-1301, USA.
|
|
|
|
#ifndef GOLD_DESCRIPTORS_H
|
|
#define GOLD_DESCRIPTORS_H
|
|
|
|
#include <vector>
|
|
|
|
namespace gold
|
|
{
|
|
|
|
class Lock;
|
|
|
|
// This class manages file descriptors for gold.
|
|
|
|
class Descriptors
|
|
{
|
|
public:
|
|
Descriptors();
|
|
|
|
// Get a file descriptor for a file. The DESCRIPTOR parameter is
|
|
// the descriptor the last time the file was used; this will be -1
|
|
// if this is the first time the file is being opened. The NAME,
|
|
// FLAGS, and MODE parameters are as for ::open. NAME must be in
|
|
// permanent storage. This returns the descriptor to use, which may
|
|
// or may not be the same as DESCRIPTOR. If there is an error
|
|
// opening the file, this will return -1 with errno set
|
|
// appropriately.
|
|
int
|
|
open(int descriptor, const char* name, int flags, int mode = 0);
|
|
|
|
// Release the file descriptor DESCRIPTOR. If PERMANENT is true, it
|
|
// will be closed, and the caller may not reopen it. If PERMANENT
|
|
// is false this doesn't necessarily close the descriptor, but it
|
|
// makes it available to be closed; the descriptor must not be used
|
|
// again except as an argument to Descriptor::open.
|
|
void
|
|
release(int descriptor, bool permanent);
|
|
|
|
private:
|
|
// Information kept for a descriptor.
|
|
struct Open_descriptor
|
|
{
|
|
// File name currently associated with descriptor. This is empty
|
|
// if none.
|
|
const char* name;
|
|
// Index of next descriptor on stack of released descriptors.
|
|
int stack_next;
|
|
// Whether the descriptor is currently in use.
|
|
bool inuse;
|
|
// Whether this is a write descriptor.
|
|
bool is_write;
|
|
};
|
|
|
|
bool
|
|
close_some_descriptor();
|
|
|
|
// We need to lock before accessing any fields.
|
|
Lock* lock_;
|
|
// Information for descriptors.
|
|
std::vector<Open_descriptor> open_descriptors_;
|
|
// Top of stack.
|
|
int stack_top_;
|
|
// The current number of file descriptors open.
|
|
int current_;
|
|
// The maximum number of file descriptors we open.
|
|
int limit_;
|
|
};
|
|
|
|
// File descriptors are a centralized data structure, and we use a
|
|
// global variable rather than passing the data structure into every
|
|
// routine that does file I/O.
|
|
|
|
extern Descriptors descriptors;
|
|
|
|
inline int
|
|
open_descriptor(int descriptor, const char* name, int flags, int mode = 0)
|
|
{ return descriptors.open(descriptor, name, flags, mode); }
|
|
|
|
inline void
|
|
release_descriptor(int descriptor, bool permanent)
|
|
{ descriptors.release(descriptor, permanent); }
|
|
|
|
} // End namespace gold.
|
|
|
|
#endif // !defined(GOLD_DESCRIPTORS_H)
|