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Diffstat (limited to 'libs/ardour/worker.cc')
-rw-r--r-- | libs/ardour/worker.cc | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/libs/ardour/worker.cc b/libs/ardour/worker.cc new file mode 100644 index 0000000000..c108f653c4 --- /dev/null +++ b/libs/ardour/worker.cc @@ -0,0 +1,115 @@ +/* + Copyright (C) 2012 Paul Davis + Author: David Robillard + + 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include <stdlib.h> + +#include "ardour/worker.h" +#include "pbd/error.h" + +namespace ARDOUR { + +Worker::Worker(Workee* workee, uint32_t ring_size) + : _workee(workee) + , _thread(Glib::Thread::create(sigc::mem_fun(*this, &Worker::run), true)) + , _requests(new RingBuffer<uint8_t>(ring_size)) + , _responses(new RingBuffer<uint8_t>(ring_size)) + , _response((uint8_t*)malloc(ring_size)) + , _sem(0) + , _exit(false) +{} + +Worker::~Worker() +{ + _exit = true; + _sem.post(); + _thread->join(); +} + +bool +Worker::schedule(uint32_t size, const void* data) +{ + if (_requests->write((const uint8_t*)&size, sizeof(size)) != sizeof(size)) { + return false; + } + if (_requests->write((const uint8_t*)data, size) != size) { + return false; // FIXME: corruption + } + _sem.post(); + return true; +} + +bool +Worker::respond(uint32_t size, const void* data) +{ + if (_responses->write((const uint8_t*)&size, sizeof(size)) != sizeof(size)) { + return false; + } + if (_responses->write((const uint8_t*)data, size) != size) { + return false; // FIXME: corruption + } + return true; +} + +void +Worker::emit_responses() +{ + uint32_t read_space = _responses->read_space(); + uint32_t size = 0; + while (read_space > sizeof(size)) { + _responses->read((uint8_t*)&size, sizeof(size)); + _responses->read(_response, size); + _workee->work_response(size, _response); + read_space -= sizeof(size) + size; + } +} + +void +Worker::run() +{ + void* buf = NULL; + size_t buf_size = 0; + while (true) { + _sem.wait(); + if (_exit) { + return; + } + + uint32_t size = 0; + if (_requests->read((uint8_t*)&size, sizeof(size)) < sizeof(size)) { + PBD::error << "Worker: Error reading size from request ring" + << endmsg; + continue; + } + + if (size > buf_size) { + buf = realloc(buf, size); + buf_size = size; + } + + if (_requests->read((uint8_t*)buf, size) < size) { + PBD::error << "Worker: Error reading body from request ring" + << endmsg; + continue; // TODO: This is probably fatal + } + + _workee->work(size, buf); + } +} + +} // namespace ARDOUR |