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author | Matthias P. Braendli <matthias.braendli@mpb.li> | 2019-10-07 04:52:50 +0200 |
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committer | Matthias P. Braendli <matthias.braendli@mpb.li> | 2019-10-07 04:52:50 +0200 |
commit | 0aa6201a490bfabc0ae021ceb9f1fb0f46727c5d (patch) | |
tree | a71d934d8151dd43e7c16555fef17fd749c5da70 /lib/asio/detail/impl/signal_set_service.ipp | |
parent | 558d74bffd9f069955af52c0b308a1d6169bcff0 (diff) | |
parent | 0330221d51421caa110b8c5dcb567cc3d0620eb9 (diff) | |
download | dabmod-0aa6201a490bfabc0ae021ceb9f1fb0f46727c5d.tar.gz dabmod-0aa6201a490bfabc0ae021ceb9f1fb0f46727c5d.tar.bz2 dabmod-0aa6201a490bfabc0ae021ceb9f1fb0f46727c5d.zip |
Merge lime output into next branch
Diffstat (limited to 'lib/asio/detail/impl/signal_set_service.ipp')
-rw-r--r-- | lib/asio/detail/impl/signal_set_service.ipp | 669 |
1 files changed, 0 insertions, 669 deletions
diff --git a/lib/asio/detail/impl/signal_set_service.ipp b/lib/asio/detail/impl/signal_set_service.ipp deleted file mode 100644 index dd68fc1..0000000 --- a/lib/asio/detail/impl/signal_set_service.ipp +++ /dev/null @@ -1,669 +0,0 @@ -// -// detail/impl/signal_set_service.ipp -// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -// -// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com) -// -// Distributed under the Boost Software License, Version 1.0. (See accompanying -// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -// - -#ifndef ASIO_DETAIL_IMPL_SIGNAL_SET_SERVICE_IPP -#define ASIO_DETAIL_IMPL_SIGNAL_SET_SERVICE_IPP - -#if defined(_MSC_VER) && (_MSC_VER >= 1200) -# pragma once -#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) - -#include "asio/detail/config.hpp" - -#include <cstring> -#include <stdexcept> -#include "asio/detail/reactor.hpp" -#include "asio/detail/signal_blocker.hpp" -#include "asio/detail/signal_set_service.hpp" -#include "asio/detail/static_mutex.hpp" -#include "asio/detail/throw_exception.hpp" - -#include "asio/detail/push_options.hpp" - -namespace asio { -namespace detail { - -struct signal_state -{ - // Mutex used for protecting global state. - static_mutex mutex_; - - // The read end of the pipe used for signal notifications. - int read_descriptor_; - - // The write end of the pipe used for signal notifications. - int write_descriptor_; - - // Whether the signal state has been prepared for a fork. - bool fork_prepared_; - - // The head of a linked list of all signal_set_service instances. - class signal_set_service* service_list_; - - // A count of the number of objects that are registered for each signal. - std::size_t registration_count_[max_signal_number]; -}; - -signal_state* get_signal_state() -{ - static signal_state state = { - ASIO_STATIC_MUTEX_INIT, -1, -1, false, 0, { 0 } }; - return &state; -} - -void asio_signal_handler(int signal_number) -{ -#if defined(ASIO_WINDOWS) \ - || defined(ASIO_WINDOWS_RUNTIME) \ - || defined(__CYGWIN__) - signal_set_service::deliver_signal(signal_number); -#else // defined(ASIO_WINDOWS) - // || defined(ASIO_WINDOWS_RUNTIME) - // || defined(__CYGWIN__) - int saved_errno = errno; - signal_state* state = get_signal_state(); - signed_size_type result = ::write(state->write_descriptor_, - &signal_number, sizeof(signal_number)); - (void)result; - errno = saved_errno; -#endif // defined(ASIO_WINDOWS) - // || defined(ASIO_WINDOWS_RUNTIME) - // || defined(__CYGWIN__) - -#if defined(ASIO_HAS_SIGNAL) && !defined(ASIO_HAS_SIGACTION) - ::signal(signal_number, asio_signal_handler); -#endif // defined(ASIO_HAS_SIGNAL) && !defined(ASIO_HAS_SIGACTION) -} - -#if !defined(ASIO_WINDOWS) \ - && !defined(ASIO_WINDOWS_RUNTIME) \ - && !defined(__CYGWIN__) -class signal_set_service::pipe_read_op : public reactor_op -{ -public: - pipe_read_op() - : reactor_op(&pipe_read_op::do_perform, pipe_read_op::do_complete) - { - } - - static status do_perform(reactor_op*) - { - signal_state* state = get_signal_state(); - - int fd = state->read_descriptor_; - int signal_number = 0; - while (::read(fd, &signal_number, sizeof(int)) == sizeof(int)) - if (signal_number >= 0 && signal_number < max_signal_number) - signal_set_service::deliver_signal(signal_number); - - return not_done; - } - - static void do_complete(void* /*owner*/, operation* base, - const asio::error_code& /*ec*/, - std::size_t /*bytes_transferred*/) - { - pipe_read_op* o(static_cast<pipe_read_op*>(base)); - delete o; - } -}; -#endif // !defined(ASIO_WINDOWS) - // && !defined(ASIO_WINDOWS_RUNTIME) - // && !defined(__CYGWIN__) - -signal_set_service::signal_set_service( - asio::io_context& io_context) - : service_base<signal_set_service>(io_context), - io_context_(asio::use_service<io_context_impl>(io_context)), -#if !defined(ASIO_WINDOWS) \ - && !defined(ASIO_WINDOWS_RUNTIME) \ - && !defined(__CYGWIN__) - reactor_(asio::use_service<reactor>(io_context)), -#endif // !defined(ASIO_WINDOWS) - // && !defined(ASIO_WINDOWS_RUNTIME) - // && !defined(__CYGWIN__) - next_(0), - prev_(0) -{ - get_signal_state()->mutex_.init(); - -#if !defined(ASIO_WINDOWS) \ - && !defined(ASIO_WINDOWS_RUNTIME) \ - && !defined(__CYGWIN__) - reactor_.init_task(); -#endif // !defined(ASIO_WINDOWS) - // && !defined(ASIO_WINDOWS_RUNTIME) - // && !defined(__CYGWIN__) - - for (int i = 0; i < max_signal_number; ++i) - registrations_[i] = 0; - - add_service(this); -} - -signal_set_service::~signal_set_service() -{ - remove_service(this); -} - -void signal_set_service::shutdown() -{ - remove_service(this); - - op_queue<operation> ops; - - for (int i = 0; i < max_signal_number; ++i) - { - registration* reg = registrations_[i]; - while (reg) - { - ops.push(*reg->queue_); - reg = reg->next_in_table_; - } - } - - io_context_.abandon_operations(ops); -} - -void signal_set_service::notify_fork( - asio::io_context::fork_event fork_ev) -{ -#if !defined(ASIO_WINDOWS) \ - && !defined(ASIO_WINDOWS_RUNTIME) \ - && !defined(__CYGWIN__) - signal_state* state = get_signal_state(); - static_mutex::scoped_lock lock(state->mutex_); - - switch (fork_ev) - { - case asio::io_context::fork_prepare: - { - int read_descriptor = state->read_descriptor_; - state->fork_prepared_ = true; - lock.unlock(); - reactor_.deregister_internal_descriptor(read_descriptor, reactor_data_); - reactor_.cleanup_descriptor_data(reactor_data_); - } - break; - case asio::io_context::fork_parent: - if (state->fork_prepared_) - { - int read_descriptor = state->read_descriptor_; - state->fork_prepared_ = false; - lock.unlock(); - reactor_.register_internal_descriptor(reactor::read_op, - read_descriptor, reactor_data_, new pipe_read_op); - } - break; - case asio::io_context::fork_child: - if (state->fork_prepared_) - { - asio::detail::signal_blocker blocker; - close_descriptors(); - open_descriptors(); - int read_descriptor = state->read_descriptor_; - state->fork_prepared_ = false; - lock.unlock(); - reactor_.register_internal_descriptor(reactor::read_op, - read_descriptor, reactor_data_, new pipe_read_op); - } - break; - default: - break; - } -#else // !defined(ASIO_WINDOWS) - // && !defined(ASIO_WINDOWS_RUNTIME) - // && !defined(__CYGWIN__) - (void)fork_ev; -#endif // !defined(ASIO_WINDOWS) - // && !defined(ASIO_WINDOWS_RUNTIME) - // && !defined(__CYGWIN__) -} - -void signal_set_service::construct( - signal_set_service::implementation_type& impl) -{ - impl.signals_ = 0; -} - -void signal_set_service::destroy( - signal_set_service::implementation_type& impl) -{ - asio::error_code ignored_ec; - clear(impl, ignored_ec); - cancel(impl, ignored_ec); -} - -asio::error_code signal_set_service::add( - signal_set_service::implementation_type& impl, - int signal_number, asio::error_code& ec) -{ - // Check that the signal number is valid. - if (signal_number < 0 || signal_number >= max_signal_number) - { - ec = asio::error::invalid_argument; - return ec; - } - - signal_state* state = get_signal_state(); - static_mutex::scoped_lock lock(state->mutex_); - - // Find the appropriate place to insert the registration. - registration** insertion_point = &impl.signals_; - registration* next = impl.signals_; - while (next && next->signal_number_ < signal_number) - { - insertion_point = &next->next_in_set_; - next = next->next_in_set_; - } - - // Only do something if the signal is not already registered. - if (next == 0 || next->signal_number_ != signal_number) - { - registration* new_registration = new registration; - -#if defined(ASIO_HAS_SIGNAL) || defined(ASIO_HAS_SIGACTION) - // Register for the signal if we're the first. - if (state->registration_count_[signal_number] == 0) - { -# if defined(ASIO_HAS_SIGACTION) - using namespace std; // For memset. - struct sigaction sa; - memset(&sa, 0, sizeof(sa)); - sa.sa_handler = asio_signal_handler; - sigfillset(&sa.sa_mask); - if (::sigaction(signal_number, &sa, 0) == -1) -# else // defined(ASIO_HAS_SIGACTION) - if (::signal(signal_number, asio_signal_handler) == SIG_ERR) -# endif // defined(ASIO_HAS_SIGACTION) - { -# if defined(ASIO_WINDOWS) || defined(__CYGWIN__) - ec = asio::error::invalid_argument; -# else // defined(ASIO_WINDOWS) || defined(__CYGWIN__) - ec = asio::error_code(errno, - asio::error::get_system_category()); -# endif // defined(ASIO_WINDOWS) || defined(__CYGWIN__) - delete new_registration; - return ec; - } - } -#endif // defined(ASIO_HAS_SIGNAL) || defined(ASIO_HAS_SIGACTION) - - // Record the new registration in the set. - new_registration->signal_number_ = signal_number; - new_registration->queue_ = &impl.queue_; - new_registration->next_in_set_ = next; - *insertion_point = new_registration; - - // Insert registration into the registration table. - new_registration->next_in_table_ = registrations_[signal_number]; - if (registrations_[signal_number]) - registrations_[signal_number]->prev_in_table_ = new_registration; - registrations_[signal_number] = new_registration; - - ++state->registration_count_[signal_number]; - } - - ec = asio::error_code(); - return ec; -} - -asio::error_code signal_set_service::remove( - signal_set_service::implementation_type& impl, - int signal_number, asio::error_code& ec) -{ - // Check that the signal number is valid. - if (signal_number < 0 || signal_number >= max_signal_number) - { - ec = asio::error::invalid_argument; - return ec; - } - - signal_state* state = get_signal_state(); - static_mutex::scoped_lock lock(state->mutex_); - - // Find the signal number in the list of registrations. - registration** deletion_point = &impl.signals_; - registration* reg = impl.signals_; - while (reg && reg->signal_number_ < signal_number) - { - deletion_point = ®->next_in_set_; - reg = reg->next_in_set_; - } - - if (reg != 0 && reg->signal_number_ == signal_number) - { -#if defined(ASIO_HAS_SIGNAL) || defined(ASIO_HAS_SIGACTION) - // Set signal handler back to the default if we're the last. - if (state->registration_count_[signal_number] == 1) - { -# if defined(ASIO_HAS_SIGACTION) - using namespace std; // For memset. - struct sigaction sa; - memset(&sa, 0, sizeof(sa)); - sa.sa_handler = SIG_DFL; - if (::sigaction(signal_number, &sa, 0) == -1) -# else // defined(ASIO_HAS_SIGACTION) - if (::signal(signal_number, SIG_DFL) == SIG_ERR) -# endif // defined(ASIO_HAS_SIGACTION) - { -# if defined(ASIO_WINDOWS) || defined(__CYGWIN__) - ec = asio::error::invalid_argument; -# else // defined(ASIO_WINDOWS) || defined(__CYGWIN__) - ec = asio::error_code(errno, - asio::error::get_system_category()); -# endif // defined(ASIO_WINDOWS) || defined(__CYGWIN__) - return ec; - } - } -#endif // defined(ASIO_HAS_SIGNAL) || defined(ASIO_HAS_SIGACTION) - - // Remove the registration from the set. - *deletion_point = reg->next_in_set_; - - // Remove the registration from the registration table. - if (registrations_[signal_number] == reg) - registrations_[signal_number] = reg->next_in_table_; - if (reg->prev_in_table_) - reg->prev_in_table_->next_in_table_ = reg->next_in_table_; - if (reg->next_in_table_) - reg->next_in_table_->prev_in_table_ = reg->prev_in_table_; - - --state->registration_count_[signal_number]; - - delete reg; - } - - ec = asio::error_code(); - return ec; -} - -asio::error_code signal_set_service::clear( - signal_set_service::implementation_type& impl, - asio::error_code& ec) -{ - signal_state* state = get_signal_state(); - static_mutex::scoped_lock lock(state->mutex_); - - while (registration* reg = impl.signals_) - { -#if defined(ASIO_HAS_SIGNAL) || defined(ASIO_HAS_SIGACTION) - // Set signal handler back to the default if we're the last. - if (state->registration_count_[reg->signal_number_] == 1) - { -# if defined(ASIO_HAS_SIGACTION) - using namespace std; // For memset. - struct sigaction sa; - memset(&sa, 0, sizeof(sa)); - sa.sa_handler = SIG_DFL; - if (::sigaction(reg->signal_number_, &sa, 0) == -1) -# else // defined(ASIO_HAS_SIGACTION) - if (::signal(reg->signal_number_, SIG_DFL) == SIG_ERR) -# endif // defined(ASIO_HAS_SIGACTION) - { -# if defined(ASIO_WINDOWS) || defined(__CYGWIN__) - ec = asio::error::invalid_argument; -# else // defined(ASIO_WINDOWS) || defined(__CYGWIN__) - ec = asio::error_code(errno, - asio::error::get_system_category()); -# endif // defined(ASIO_WINDOWS) || defined(__CYGWIN__) - return ec; - } - } -#endif // defined(ASIO_HAS_SIGNAL) || defined(ASIO_HAS_SIGACTION) - - // Remove the registration from the registration table. - if (registrations_[reg->signal_number_] == reg) - registrations_[reg->signal_number_] = reg->next_in_table_; - if (reg->prev_in_table_) - reg->prev_in_table_->next_in_table_ = reg->next_in_table_; - if (reg->next_in_table_) - reg->next_in_table_->prev_in_table_ = reg->prev_in_table_; - - --state->registration_count_[reg->signal_number_]; - - impl.signals_ = reg->next_in_set_; - delete reg; - } - - ec = asio::error_code(); - return ec; -} - -asio::error_code signal_set_service::cancel( - signal_set_service::implementation_type& impl, - asio::error_code& ec) -{ - ASIO_HANDLER_OPERATION((io_context_.context(), - "signal_set", &impl, 0, "cancel")); - - op_queue<operation> ops; - { - signal_state* state = get_signal_state(); - static_mutex::scoped_lock lock(state->mutex_); - - while (signal_op* op = impl.queue_.front()) - { - op->ec_ = asio::error::operation_aborted; - impl.queue_.pop(); - ops.push(op); - } - } - - io_context_.post_deferred_completions(ops); - - ec = asio::error_code(); - return ec; -} - -void signal_set_service::deliver_signal(int signal_number) -{ - signal_state* state = get_signal_state(); - static_mutex::scoped_lock lock(state->mutex_); - - signal_set_service* service = state->service_list_; - while (service) - { - op_queue<operation> ops; - - registration* reg = service->registrations_[signal_number]; - while (reg) - { - if (reg->queue_->empty()) - { - ++reg->undelivered_; - } - else - { - while (signal_op* op = reg->queue_->front()) - { - op->signal_number_ = signal_number; - reg->queue_->pop(); - ops.push(op); - } - } - - reg = reg->next_in_table_; - } - - service->io_context_.post_deferred_completions(ops); - - service = service->next_; - } -} - -void signal_set_service::add_service(signal_set_service* service) -{ - signal_state* state = get_signal_state(); - static_mutex::scoped_lock lock(state->mutex_); - -#if !defined(ASIO_WINDOWS) && !defined(__CYGWIN__) - // If this is the first service to be created, open a new pipe. - if (state->service_list_ == 0) - open_descriptors(); -#endif // !defined(ASIO_WINDOWS) && !defined(__CYGWIN__) - - // If an io_context object is thread-unsafe then it must be the only - // io_context used to create signal_set objects. - if (state->service_list_ != 0) - { - if (!ASIO_CONCURRENCY_HINT_IS_LOCKING(SCHEDULER, - service->io_context_.concurrency_hint()) - || !ASIO_CONCURRENCY_HINT_IS_LOCKING(SCHEDULER, - state->service_list_->io_context_.concurrency_hint())) - { - std::logic_error ex( - "Thread-unsafe io_context objects require " - "exclusive access to signal handling."); - asio::detail::throw_exception(ex); - } - } - - // Insert service into linked list of all services. - service->next_ = state->service_list_; - service->prev_ = 0; - if (state->service_list_) - state->service_list_->prev_ = service; - state->service_list_ = service; - -#if !defined(ASIO_WINDOWS) \ - && !defined(ASIO_WINDOWS_RUNTIME) \ - && !defined(__CYGWIN__) - // Register for pipe readiness notifications. - int read_descriptor = state->read_descriptor_; - lock.unlock(); - service->reactor_.register_internal_descriptor(reactor::read_op, - read_descriptor, service->reactor_data_, new pipe_read_op); -#endif // !defined(ASIO_WINDOWS) - // && !defined(ASIO_WINDOWS_RUNTIME) - // && !defined(__CYGWIN__) -} - -void signal_set_service::remove_service(signal_set_service* service) -{ - signal_state* state = get_signal_state(); - static_mutex::scoped_lock lock(state->mutex_); - - if (service->next_ || service->prev_ || state->service_list_ == service) - { -#if !defined(ASIO_WINDOWS) \ - && !defined(ASIO_WINDOWS_RUNTIME) \ - && !defined(__CYGWIN__) - // Disable the pipe readiness notifications. - int read_descriptor = state->read_descriptor_; - lock.unlock(); - service->reactor_.deregister_internal_descriptor( - read_descriptor, service->reactor_data_); - service->reactor_.cleanup_descriptor_data(service->reactor_data_); - lock.lock(); -#endif // !defined(ASIO_WINDOWS) - // && !defined(ASIO_WINDOWS_RUNTIME) - // && !defined(__CYGWIN__) - - // Remove service from linked list of all services. - if (state->service_list_ == service) - state->service_list_ = service->next_; - if (service->prev_) - service->prev_->next_ = service->next_; - if (service->next_) - service->next_->prev_= service->prev_; - service->next_ = 0; - service->prev_ = 0; - -#if !defined(ASIO_WINDOWS) && !defined(__CYGWIN__) - // If this is the last service to be removed, close the pipe. - if (state->service_list_ == 0) - close_descriptors(); -#endif // !defined(ASIO_WINDOWS) && !defined(__CYGWIN__) - } -} - -void signal_set_service::open_descriptors() -{ -#if !defined(ASIO_WINDOWS) \ - && !defined(ASIO_WINDOWS_RUNTIME) \ - && !defined(__CYGWIN__) - signal_state* state = get_signal_state(); - - int pipe_fds[2]; - if (::pipe(pipe_fds) == 0) - { - state->read_descriptor_ = pipe_fds[0]; - ::fcntl(state->read_descriptor_, F_SETFL, O_NONBLOCK); - - state->write_descriptor_ = pipe_fds[1]; - ::fcntl(state->write_descriptor_, F_SETFL, O_NONBLOCK); - -#if defined(FD_CLOEXEC) - ::fcntl(state->read_descriptor_, F_SETFD, FD_CLOEXEC); - ::fcntl(state->write_descriptor_, F_SETFD, FD_CLOEXEC); -#endif // defined(FD_CLOEXEC) - } - else - { - asio::error_code ec(errno, - asio::error::get_system_category()); - asio::detail::throw_error(ec, "signal_set_service pipe"); - } -#endif // !defined(ASIO_WINDOWS) - // && !defined(ASIO_WINDOWS_RUNTIME) - // && !defined(__CYGWIN__) -} - -void signal_set_service::close_descriptors() -{ -#if !defined(ASIO_WINDOWS) \ - && !defined(ASIO_WINDOWS_RUNTIME) \ - && !defined(__CYGWIN__) - signal_state* state = get_signal_state(); - - if (state->read_descriptor_ != -1) - ::close(state->read_descriptor_); - state->read_descriptor_ = -1; - - if (state->write_descriptor_ != -1) - ::close(state->write_descriptor_); - state->write_descriptor_ = -1; -#endif // !defined(ASIO_WINDOWS) - // && !defined(ASIO_WINDOWS_RUNTIME) - // && !defined(__CYGWIN__) -} - -void signal_set_service::start_wait_op( - signal_set_service::implementation_type& impl, signal_op* op) -{ - io_context_.work_started(); - - signal_state* state = get_signal_state(); - static_mutex::scoped_lock lock(state->mutex_); - - registration* reg = impl.signals_; - while (reg) - { - if (reg->undelivered_ > 0) - { - --reg->undelivered_; - op->signal_number_ = reg->signal_number_; - io_context_.post_deferred_completion(op); - return; - } - - reg = reg->next_in_set_; - } - - impl.queue_.push(op); -} - -} // namespace detail -} // namespace asio - -#include "asio/detail/pop_options.hpp" - -#endif // ASIO_DETAIL_IMPL_SIGNAL_SET_SERVICE_IPP |