2 Copyright (C) 2012 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"
26 #include <glibmm/timer.h>
30 Worker::Worker(Workee* workee, uint32_t ring_size)
32 , _requests(new RingBuffer<uint8_t>(ring_size))
33 , _responses(new RingBuffer<uint8_t>(ring_size))
34 , _response((uint8_t*)malloc(ring_size))
35 , _sem ("worker_semaphore", 0)
37 , _thread (Glib::Threads::Thread::create(sigc::mem_fun(*this, &Worker::run)))
48 Worker::schedule(uint32_t size, const void* data)
50 if (_requests->write_space() < size + sizeof(size)) {
53 if (_requests->write((const uint8_t*)&size, sizeof(size)) != sizeof(size)) {
56 if (_requests->write((const uint8_t*)data, size) != size) {
64 Worker::respond(uint32_t size, const void* data)
66 if (_requests->write_space() < size + sizeof(size)) {
69 if (_responses->write((const uint8_t*)&size, sizeof(size)) != sizeof(size)) {
72 if (_responses->write((const uint8_t*)data, size) != size) {
79 Worker::verify_message_completeness(RingBuffer<uint8_t>* rb)
81 uint32_t read_space = rb->read_space();
83 RingBuffer<uint8_t>::rw_vector vec;
84 rb->get_read_vector (&vec);
85 if (vec.len[0] + vec.len[1] < sizeof(size)) {
88 if (vec.len[0] >= sizeof(size)) {
89 memcpy (&size, vec.buf[0], sizeof (size));
91 memcpy (&size, vec.buf[0], vec.len[0]);
92 memcpy (&size + vec.len[0], vec.buf[1], sizeof(size) - vec.len[0]);
94 if (read_space < size+sizeof(size)) {
95 /* message from writer is yet incomplete. respond next cycle */
102 Worker::emit_responses()
104 uint32_t read_space = _responses->read_space();
106 while (read_space >= sizeof(size)) {
107 if (!verify_message_completeness(_responses)) {
108 /* message from writer is yet incomplete. respond next cycle */
111 /* read and send response */
112 _responses->read((uint8_t*)&size, sizeof(size));
113 _responses->read(_response, size);
114 _workee->work_response(size, _response);
115 read_space -= sizeof(size) + size;
131 uint32_t size = _requests->read_space();
132 if (size < sizeof(size)) {
133 PBD::error << "Worker: no work-data on ring buffer" << endmsg;
136 while (!verify_message_completeness(_requests)) {
143 if (_requests->read((uint8_t*)&size, sizeof(size)) < sizeof(size)) {
144 PBD::error << "Worker: Error reading size from request ring"
149 if (size > buf_size) {
150 buf = realloc(buf, size);
154 PBD::error << "Worker: Error allocating memory"
156 buf_size = 0; // TODO: This is probably fatal
160 if (_requests->read((uint8_t*)buf, size) < size) {
161 PBD::error << "Worker: Error reading body from request ring"
163 continue; // TODO: This is probably fatal
166 _workee->work(size, buf);
170 } // namespace ARDOUR