409d804ee8
Programs like grep called in '$' command will fail due to SIGPIPE for example. So we need to keep the pipe open.
137 lines
3.2 KiB
C++
137 lines
3.2 KiB
C++
#include "event_manager.hh"
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#include "containers.hh"
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#include <unistd.h>
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namespace Kakoune
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{
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FDWatcher::FDWatcher(int fd, Callback callback)
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: m_fd{fd}, m_callback{std::move(callback)}
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{
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EventManager::instance().m_fd_watchers.push_back(this);
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}
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FDWatcher::~FDWatcher()
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{
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unordered_erase(EventManager::instance().m_fd_watchers, this);
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}
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void FDWatcher::run(EventMode mode)
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{
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m_callback(*this, mode);
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}
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void FDWatcher::close_fd()
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{
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if (m_fd != -1)
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{
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close(m_fd);
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m_fd = -1;
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}
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}
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Timer::Timer(TimePoint date, Callback callback, EventMode mode)
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: m_date{date}, m_callback{std::move(callback)}, m_mode(mode)
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{
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if (m_callback and EventManager::has_instance())
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EventManager::instance().m_timers.push_back(this);
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}
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Timer::~Timer()
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{
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if (m_callback and EventManager::has_instance())
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unordered_erase(EventManager::instance().m_timers, this);
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}
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void Timer::run(EventMode mode)
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{
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kak_assert(m_callback);
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if (mode == m_mode)
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{
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m_date = TimePoint::max();
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m_callback(*this);
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}
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else // try again a little later
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m_date = Clock::now() + std::chrono::milliseconds{10};
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}
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EventManager::EventManager()
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{
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FD_ZERO(&m_forced_fd);
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}
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EventManager::~EventManager()
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{
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kak_assert(m_fd_watchers.empty());
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kak_assert(m_timers.empty());
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}
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void EventManager::handle_next_events(EventMode mode)
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{
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int max_fd = 0;
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fd_set rfds;
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FD_ZERO(&rfds);
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for (auto& watcher : m_fd_watchers)
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{
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const int fd = watcher->fd();
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if (fd != -1)
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{
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max_fd = std::max(fd, max_fd);
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FD_SET(fd, &rfds);
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}
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}
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bool with_timeout = false;
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timeval tv{};
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if (not m_timers.empty())
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{
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auto next_date = (*std::min_element(
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m_timers.begin(), m_timers.end(), [](Timer* lhs, Timer* rhs) {
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return lhs->next_date() < rhs->next_date();
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}))->next_date();
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if (next_date != TimePoint::max())
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{
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with_timeout = true;
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using namespace std::chrono; using us = std::chrono::microseconds;
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auto usecs = std::max(us(0), duration_cast<us>(next_date - Clock::now()));
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auto secs = duration_cast<seconds>(usecs);
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tv = timeval{ (time_t)secs.count(), (suseconds_t)(usecs - secs).count() };
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}
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}
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int res = select(max_fd + 1, &rfds, nullptr, nullptr,
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with_timeout ? &tv : nullptr);
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// copy forced fds *after* poll, so that signal handlers can write to
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// m_forced_fd, interupt poll, and directly be serviced.
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fd_set forced = m_forced_fd;
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FD_ZERO(&m_forced_fd);
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for (int fd = 0; fd < max_fd + 1; ++fd)
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{
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if ((res > 0 and FD_ISSET(fd, &rfds)) or FD_ISSET(fd, &forced))
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{
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auto it = find_if(m_fd_watchers,
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[fd](const FDWatcher* w){return w->fd() == fd; });
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if (it != m_fd_watchers.end())
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(*it)->run(mode);
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}
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}
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TimePoint now = Clock::now();
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for (auto& timer : m_timers)
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{
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if (timer->next_date() <= now)
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timer->run(mode);
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}
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}
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void EventManager::force_signal(int fd)
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{
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FD_SET(fd, &m_forced_fd);
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}
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}
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