86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
/*
|
|
Copyright (C) 2010 Devin Anderson
|
|
|
|
This program 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 2.1 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 Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
*/
|
|
|
|
#include <new>
|
|
|
|
#include "JackMidiAsyncWaitQueue.h"
|
|
#include "JackMidiUtil.h"
|
|
#include "JackTime.h"
|
|
|
|
using Jack::JackMidiAsyncWaitQueue;
|
|
|
|
JackMidiAsyncWaitQueue::JackMidiAsyncWaitQueue(size_t max_bytes,
|
|
size_t max_messages):
|
|
JackMidiAsyncQueue(max_bytes, max_messages)
|
|
{
|
|
if (semaphore.Allocate("JackMidiAsyncWaitQueue", "midi-thread", 0)) {
|
|
throw std::bad_alloc();
|
|
}
|
|
}
|
|
|
|
JackMidiAsyncWaitQueue::~JackMidiAsyncWaitQueue()
|
|
{
|
|
semaphore.Destroy();
|
|
}
|
|
|
|
jack_midi_event_t *
|
|
JackMidiAsyncWaitQueue::DequeueEvent()
|
|
{
|
|
return DequeueEvent((long) 0);
|
|
}
|
|
|
|
jack_midi_event_t *
|
|
JackMidiAsyncWaitQueue::DequeueEvent(jack_nframes_t frame)
|
|
{
|
|
|
|
// XXX: I worry about timer resolution on Solaris and Windows. When the
|
|
// resolution for the `JackSynchro` object is milliseconds, the worst-case
|
|
// scenario for processor objects is that the wait time becomes less than a
|
|
// millisecond, and the processor object continually calls this method,
|
|
// expecting to wait a certain amount of microseconds, and ends up not
|
|
// waiting at all each time, essentially busy-waiting until the current
|
|
// frame is reached. Perhaps there should be a #define that indicates the
|
|
// wait time resolution for `JackSynchro` objects so that we can wait a
|
|
// little longer if necessary.
|
|
|
|
jack_time_t frame_time = GetTimeFromFrames(frame);
|
|
jack_time_t current_time = GetMicroSeconds();
|
|
return DequeueEvent((frame_time < current_time) ? 0 :
|
|
(long) (frame_time - current_time));
|
|
}
|
|
|
|
jack_midi_event_t *
|
|
JackMidiAsyncWaitQueue::DequeueEvent(long usec)
|
|
{
|
|
return ((usec < 0) ? semaphore.Wait() : semaphore.TimedWait(usec)) ?
|
|
JackMidiAsyncQueue::DequeueEvent() : 0;
|
|
}
|
|
|
|
Jack::JackMidiWriteQueue::EnqueueResult
|
|
JackMidiAsyncWaitQueue::EnqueueEvent(jack_nframes_t time, size_t size,
|
|
jack_midi_data_t *buffer)
|
|
{
|
|
EnqueueResult result = JackMidiAsyncQueue::EnqueueEvent(time, size,
|
|
buffer);
|
|
if (result == OK) {
|
|
semaphore.Signal();
|
|
}
|
|
return result;
|
|
}
|