mirror of
https://git.libcamera.org/libcamera/libcamera.git
synced 2025-07-14 07:59:44 +03:00
626172a16b
Source files in libcamera start by a comment block header, which
includes the file name and a one-line description of the file contents.
While the latter is useful to get a quick overview of the file contents
at a glance, the former is mostly a source of inconvenience. The name in
the comments can easily get out of sync with the file name when files
are renamed, and copy & paste during development have often lead to
incorrect names being used to start with.
Readers of the source code are expected to know which file they're
looking it. Drop the file name from the header comment block.
The change was generated with the following script:
----------------------------------------
dirs="include/libcamera src test utils"
declare -rA patterns=(
['c']=' \* '
['cpp']=' \* '
['h']=' \* '
['py']='# '
['sh']='# '
)
for ext in ${!patterns[@]} ; do
files=$(for dir in $dirs ; do find $dir -name "*.${ext}" ; done)
pattern=${patterns[${ext}]}
for file in $files ; do
name=$(basename ${file})
sed -i "s/^\(${pattern}\)${name} - /\1/" "$file"
done
done
----------------------------------------
This misses several files that are out of sync with the comment block
header. Those will be addressed separately and manually.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
150 lines
3 KiB
C++
150 lines
3 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* cam - Event loop
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*/
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#include "event_loop.h"
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#include <assert.h>
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#include <event2/event.h>
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#include <event2/thread.h>
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#include <iostream>
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EventLoop *EventLoop::instance_ = nullptr;
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EventLoop::EventLoop()
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{
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assert(!instance_);
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evthread_use_pthreads();
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base_ = event_base_new();
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instance_ = this;
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}
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EventLoop::~EventLoop()
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{
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instance_ = nullptr;
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events_.clear();
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event_base_free(base_);
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libevent_global_shutdown();
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}
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EventLoop *EventLoop::instance()
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{
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return instance_;
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}
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int EventLoop::exec()
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{
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exitCode_ = -1;
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event_base_loop(base_, EVLOOP_NO_EXIT_ON_EMPTY);
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return exitCode_;
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}
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void EventLoop::exit(int code)
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{
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exitCode_ = code;
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event_base_loopbreak(base_);
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}
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void EventLoop::callLater(const std::function<void()> &func)
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{
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{
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std::unique_lock<std::mutex> locker(lock_);
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calls_.push_back(func);
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}
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event_base_once(base_, -1, EV_TIMEOUT, dispatchCallback, this, nullptr);
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}
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void EventLoop::addFdEvent(int fd, EventType type,
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const std::function<void()> &callback)
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{
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std::unique_ptr<Event> event = std::make_unique<Event>(callback);
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short events = (type & Read ? EV_READ : 0)
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| (type & Write ? EV_WRITE : 0)
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| EV_PERSIST;
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event->event_ = event_new(base_, fd, events, &EventLoop::Event::dispatch,
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event.get());
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if (!event->event_) {
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std::cerr << "Failed to create event for fd " << fd << std::endl;
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return;
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}
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int ret = event_add(event->event_, nullptr);
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if (ret < 0) {
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std::cerr << "Failed to add event for fd " << fd << std::endl;
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return;
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}
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events_.push_back(std::move(event));
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}
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void EventLoop::addTimerEvent(const std::chrono::microseconds period,
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const std::function<void()> &callback)
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{
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std::unique_ptr<Event> event = std::make_unique<Event>(callback);
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event->event_ = event_new(base_, -1, EV_PERSIST, &EventLoop::Event::dispatch,
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event.get());
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if (!event->event_) {
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std::cerr << "Failed to create timer event" << std::endl;
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return;
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}
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struct timeval tv;
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tv.tv_sec = period.count() / 1000000ULL;
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tv.tv_usec = period.count() % 1000000ULL;
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int ret = event_add(event->event_, &tv);
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if (ret < 0) {
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std::cerr << "Failed to add timer event" << std::endl;
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return;
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}
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events_.push_back(std::move(event));
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}
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void EventLoop::dispatchCallback([[maybe_unused]] evutil_socket_t fd,
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[[maybe_unused]] short flags, void *param)
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{
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EventLoop *loop = static_cast<EventLoop *>(param);
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loop->dispatchCall();
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}
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void EventLoop::dispatchCall()
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{
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std::function<void()> call;
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{
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std::unique_lock<std::mutex> locker(lock_);
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if (calls_.empty())
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return;
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call = calls_.front();
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calls_.pop_front();
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}
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call();
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}
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EventLoop::Event::Event(const std::function<void()> &callback)
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: callback_(callback), event_(nullptr)
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{
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}
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EventLoop::Event::~Event()
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{
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event_del(event_);
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event_free(event_);
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}
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void EventLoop::Event::dispatch([[maybe_unused]] int fd,
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[[maybe_unused]] short events, void *arg)
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{
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Event *event = static_cast<Event *>(arg);
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event->callback_();
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}
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