2 Copyright (C) 2012-2016 Paul Davis
3 Author: David Robillard
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include "ardour/worker.h"
24 #include "pbd/error.h"
25 #include "pbd/compose.h"
27 #include <glibmm/timer.h>
31 Worker::Worker(Workee* workee, uint32_t ring_size, bool threaded)
33 , _requests(threaded ? new PBD::RingBuffer<uint8_t>(ring_size) : NULL)
34 , _responses(new PBD::RingBuffer<uint8_t>(ring_size))
35 , _response((uint8_t*)malloc(ring_size))
36 , _sem(string_compose ("worker_semaphore%1", this).c_str(), 0)
39 , _synchronous(!threaded)
42 _thread = Glib::Threads::Thread::create(
43 sigc::mem_fun(*this, &Worker::run));
60 Worker::schedule(uint32_t size, const void* data)
62 if (_synchronous || !_requests) {
63 _workee->work(*this, size, data);
66 if (_requests->write_space() < size + sizeof(size)) {
69 if (_requests->write((const uint8_t*)&size, sizeof(size)) != sizeof(size)) {
72 if (_requests->write((const uint8_t*)data, size) != size) {
80 Worker::respond(uint32_t size, const void* data)
82 if (_responses->write_space() < size + sizeof(size)) {
85 if (_responses->write((const uint8_t*)&size, sizeof(size)) != sizeof(size)) {
88 if (_responses->write((const uint8_t*)data, size) != size) {
95 Worker::verify_message_completeness(PBD::RingBuffer<uint8_t>* rb)
97 uint32_t read_space = rb->read_space();
99 PBD::RingBuffer<uint8_t>::rw_vector vec;
100 rb->get_read_vector (&vec);
101 if (vec.len[0] + vec.len[1] < sizeof(size)) {
104 if (vec.len[0] >= sizeof(size)) {
105 memcpy (&size, vec.buf[0], sizeof (size));
107 memcpy (&size, vec.buf[0], vec.len[0]);
108 memcpy (&size + vec.len[0], vec.buf[1], sizeof(size) - vec.len[0]);
110 if (read_space < size+sizeof(size)) {
111 /* message from writer is yet incomplete. respond next cycle */
118 Worker::emit_responses()
120 uint32_t read_space = _responses->read_space();
122 while (read_space >= sizeof(size)) {
123 if (!verify_message_completeness(_responses)) {
124 /* message from writer is yet incomplete. respond next cycle */
127 /* read and send response */
128 _responses->read((uint8_t*)&size, sizeof(size));
129 _responses->read(_response, size);
130 _workee->work_response(size, _response);
131 read_space -= sizeof(size) + size;
147 uint32_t size = _requests->read_space();
148 if (size < sizeof(size)) {
149 PBD::error << "Worker: no work-data on ring buffer" << endmsg;
152 while (!verify_message_completeness(_requests)) {
159 if (_requests->read((uint8_t*)&size, sizeof(size)) < sizeof(size)) {
160 PBD::error << "Worker: Error reading size from request ring"
165 if (size > buf_size) {
166 buf = realloc(buf, size);
170 PBD::error << "Worker: Error allocating memory"
172 buf_size = 0; // TODO: This is probably fatal
176 if (_requests->read((uint8_t*)buf, size) < size) {
177 PBD::error << "Worker: Error reading body from request ring"
179 continue; // TODO: This is probably fatal
182 _workee->work(*this, size, buf);
186 } // namespace ARDOUR