iframe-proxy | Sunbelt Computer Software

History

133 lines (103 loc) · 3.24 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

/* Node-type for loopback connections.

* Author: Steffen Vogel <post@steffenvogel.de>

* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University

* SPDX-License-Identifier: Apache-2.0

#include <cstring>

#include <villas/exceptions.hpp>

#include <villas/node/config.hpp>

#include <villas/node/memory.hpp>

#include <villas/node_compat.hpp>

#include <villas/nodes/loopback.hpp>

#include <villas/utils.hpp>

using namespace villas;

using namespace villas::node;

using namespace villas::utils;

LoopbackNode::LoopbackNode(const uuid_t &id, const std::string &name)

: Node(id, name), queuelen(DEFAULT_QUEUE_LENGTH),

mode(QueueSignalledMode::AUTO) {

queue.queue.state = State::DESTROYED;

}

LoopbackNode::~LoopbackNode() {

int ret __attribute__((unused));

ret = queue_signalled_destroy(&queue);

}

int LoopbackNode::prepare() {

assert(state == State::CHECKED);

int ret = queue_signalled_init(&queue, queuelen, &memory::mmap, mode);

if (ret)

throw RuntimeError("Failed to initialize queue");

return Node::prepare();

}

int LoopbackNode::stop() {

int ret;

ret = queue_signalled_close(&queue);

if (ret)

return ret;

return 0;

}

int LoopbackNode::_read(struct Sample *smps[], unsigned cnt) {

int avail;

struct Sample *cpys[cnt];

avail = queue_signalled_pull_many(&queue, (void **)cpys, cnt);

sample_copy_many(smps, cpys, avail);

sample_decref_many(cpys, avail);

return avail;

}

int LoopbackNode::_write(struct Sample *smps[], unsigned cnt) {

sample_incref_many(smps, cnt);

int pushed = queue_signalled_push_many(&queue, (void **)smps, cnt);

if (pushed < 0) {

sample_decref_many(smps, cnt);

return pushed;

}

// Released unpushed samples

if ((unsigned)pushed < cnt) {

sample_decref_many(smps + pushed, cnt - pushed);

logger->warn("Queue overrun");

}

return pushed;

}

std::vector<int> LoopbackNode::getPollFDs() {

return {queue_signalled_fd(&queue)};

}

const std::string &LoopbackNode::getDetails() {

if (details.empty()) {

details = fmt::format("queuelen={}", queuelen);

}

return details;

}

int LoopbackNode::parse(json_t *json) {

const char *mode_str = nullptr;

json_error_t err;

int ret;

ret = json_unpack_ex(json, &err, 0, "{ s?: i, s?: s }", "queuelen", &queuelen,

"mode", &mode_str);

if (ret)

throw ConfigError(json, err, "node-config-node-loopback");

if (mode_str) {

if (!strcmp(mode_str, "auto"))

mode = QueueSignalledMode::AUTO;

#ifdef HAVE_EVENTFD

else if (!strcmp(mode_str, "eventfd"))

mode = QueueSignalledMode::EVENTFD;

#endif

else if (!strcmp(mode_str, "pthread"))

mode = QueueSignalledMode::PTHREAD;

else if (!strcmp(mode_str, "polling"))

mode = QueueSignalledMode::POLLING;

else

throw ConfigError(json, "node-config-node-loopback-mode",

"Unknown mode '{}'", mode_str);

}

return Node::parse(json);

}

// Register node

static char n[] = "loopback";

static char d[] = "Loopback node-type";

static NodePlugin<LoopbackNode, n, d,

(int)NodeFactory::Flags::SUPPORTS_POLL |

(int)NodeFactory::Flags::SUPPORTS_READ |

(int)NodeFactory::Flags::SUPPORTS_WRITE>

nf;

Sunbelt Computer Software

PL/B Language Development and Support

Navigation Menu

Uh oh!

Sunbelt Computer Software

PL/B Language Development and Support

Uh oh!

FilesExpand file tree

loopback.cpp

Latest commit

History

loopback.cpp

File metadata and controls