mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2012.
|
|
|
|
This file is part of Sortix.
|
|
|
|
Sortix 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.
|
|
|
|
Sortix 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
|
|
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
textbuffer.cpp
|
|
Provides a indexable text buffer for used by text mode terminals.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <assert.h>
|
|
|
|
#include <sortix/kernel/kernel.h>
|
|
#include <sortix/kernel/kthread.h>
|
|
#include <sortix/kernel/refcount.h>
|
|
#include <sortix/kernel/textbuffer.h>
|
|
|
|
namespace Sortix {
|
|
|
|
TextBufferHandle::TextBufferHandle(TextBuffer* textbuf, bool deletebuf,
|
|
TextBuffer* def, bool deletedef)
|
|
{
|
|
this->textbuf = textbuf;
|
|
this->deletebuf = deletebuf;
|
|
this->def = def;
|
|
this->deletedef = deletedef;
|
|
this->numused = 0;
|
|
this->mutex = KTHREAD_MUTEX_INITIALIZER;
|
|
this->unusedcond = KTHREAD_COND_INITIALIZER;
|
|
}
|
|
|
|
TextBufferHandle::~TextBufferHandle()
|
|
{
|
|
if ( deletebuf )
|
|
delete textbuf;
|
|
if ( deletedef )
|
|
delete def;
|
|
}
|
|
|
|
TextBuffer* TextBufferHandle::Acquire()
|
|
{
|
|
ScopedLock lock(&mutex);
|
|
numused++;
|
|
if ( textbuf )
|
|
return textbuf;
|
|
if ( !def )
|
|
numused--;
|
|
return def;
|
|
}
|
|
|
|
void TextBufferHandle::Release(TextBuffer* textbuf)
|
|
{
|
|
assert(textbuf);
|
|
ScopedLock lock(&mutex);
|
|
assert(numused);
|
|
if ( !--numused )
|
|
kthread_cond_signal(&unusedcond);
|
|
}
|
|
|
|
void TextBufferHandle::Replace(TextBuffer* newtextbuf, bool deletebuf)
|
|
{
|
|
ScopedLock lock(&mutex);
|
|
while ( numused )
|
|
kthread_cond_wait(&unusedcond, &mutex);
|
|
if ( deletebuf )
|
|
delete textbuf;
|
|
this->textbuf = newtextbuf;
|
|
this->deletebuf = deletebuf;
|
|
}
|
|
|
|
} // namespace Sortix
|