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sortix--sortix/libc/stdio/fregister.cpp
Jonas 'Sortie' Termansen 1ddd404ff9 Thread-secure stdio.
2014-07-08 17:41:52 +02:00

61 lines
1.8 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
stdio/fregister.cpp
Registers a FILE in the global list of open FILES, which allows the standard
library to close and flush all open files upon program exit.
*******************************************************************************/
#include <pthread.h>
#include <stdio.h>
extern "C"
{
FILE* __first_file = NULL;
pthread_mutex_t __first_file_lock = PTHREAD_MUTEX_INITIALIZER;
}
extern "C" void fregister(FILE* fp)
{
pthread_mutex_lock(&__first_file_lock);
fp->flags |= _FILE_REGISTERED;
if ( __first_file )
{
fp->next = __first_file;
__first_file->prev = fp;
}
__first_file = fp;
pthread_mutex_unlock(&__first_file_lock);
}
extern "C" void funregister(FILE* fp)
{
if ( !(fp->flags & _FILE_REGISTERED) )
return;
pthread_mutex_lock(&__first_file_lock);
if ( !fp->prev )
__first_file = fp->next;
if ( fp->prev )
fp->prev->next = fp->next;
if ( fp->next )
fp->next->prev = fp->prev;
fp->flags &= ~_FILE_REGISTERED;
pthread_mutex_unlock(&__first_file_lock);
}