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/* lockfile - Handle locking and unlocking of stream. Hurd cthreads version.
Copyright (C) 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <cthreads.h> /* Must come before <stdio.h>! */
#define _IO_MTSAFE_IO
#include <stdio.h>
#include <assert.h>
#ifdef _STDIO_USES_IOSTREAM
void
_cthreads_flockfile (_IO_FILE *fp)
{
cthread_t self = cthread_self ();
if (fp->_lock->owner == self)
{
assert (fp->_lock->count != 0);
++fp->_lock->count;
}
else
{
mutex_lock (&fp->_lock->mutex);
assert (fp->_lock->owner == 0);
fp->_lock->owner = self;
assert (fp->_lock->count == 0);
fp->_lock->count = 1;
}
}
void
_cthreads_funlockfile (_IO_FILE *fp)
{
if (--fp->_lock->count == 0)
{
assert (fp->_lock->owner == cthread_self ());
fp->_lock->owner = 0;
mutex_unlock (&fp->_lock->mutex);
}
}
int
_cthreads_ftrylockfile (_IO_FILE *fp)
{
cthread_t self = cthread_self ();
if (fp->_lock->owner == self)
{
assert (fp->_lock->count != 0);
++fp->_lock->count;
}
else if (mutex_try_lock (&fp->_lock->mutex))
{
assert (fp->_lock->owner == 0);
fp->_lock->owner = self;
assert (fp->_lock->count == 0);
fp->_lock->count = 1;
}
else
return 0; /* No lock for us. */
/* We got the lock. */
return 1;
}
# undef _IO_flockfile
# undef _IO_funlockfile
# undef _IO_ftrylockfile
# pragma weak _IO_flockfile = _cthreads_flockfile
# pragma weak _IO_funlockfile = _cthreads_funlockfile
# pragma weak _IO_ftrylockfile= _cthreads_ftrylockfile
# undef flockfile
# undef funlockfile
# undef ftrylockfile
# pragma weak flockfile = _cthreads_flockfile
# pragma weak funlockfile = _cthreads_funlockfile
# pragma weak ftrylockfile = _cthreads_ftrylockfile
#endif /* _STDIO_USES_IOSTREAM */
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