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/usr/include/boost/asio

Name	Size	Mode	Actions
detail/	-	0755	rm
execution/	-	0755	rm
generic/	-	0755	rm
impl/	-	0755	rm
ip/	-	0755	rm
local/	-	0755	rm
posix/	-	0755	rm
ssl/	-	0755	rm
traits/	-	0755	rm
ts/	-	0755	rm
windows/	-	0755	rm
any_io_executor.hpp	2625	0644	edit dl rm
associated_allocator.hpp	3791	0644	edit dl rm
associated_executor.hpp	5057	0644	edit dl rm
async_result.hpp	19423	0644	edit dl rm
awaitable.hpp	3270	0644	edit dl rm
basic_datagram_socket.hpp	47521	0644	edit dl rm
basic_deadline_timer.hpp	24158	0644	edit dl rm
basic_io_object.hpp	8096	0644	edit dl rm
basic_raw_socket.hpp	46996	0644	edit dl rm
basic_seq_packet_socket.hpp	29184	0644	edit dl rm
basic_serial_port.hpp	31912	0644	edit dl rm
basic_signal_set.hpp	19876	0644	edit dl rm
basic_socket.hpp	65516	0644	edit dl rm
basic_socket_acceptor.hpp	88062	0644	edit dl rm
basic_socket_iostream.hpp	13298	0644	edit dl rm
basic_socket_streambuf.hpp	21713	0644	edit dl rm
basic_streambuf.hpp	13714	0644	edit dl rm
basic_streambuf_fwd.hpp	920	0644	edit dl rm
basic_stream_socket.hpp	41520	0644	edit dl rm
basic_waitable_timer.hpp	28528	0644	edit dl rm
bind_executor.hpp	16510	0644	edit dl rm
buffer.hpp	83254	0644	edit dl rm
buffered_read_stream.hpp	8424	0644	edit dl rm
buffered_read_stream_fwd.hpp	699	0644	edit dl rm
buffered_stream.hpp	9074	0644	edit dl rm
buffered_stream_fwd.hpp	669	0644	edit dl rm
buffered_write_stream.hpp	8042	0644	edit dl rm
buffered_write_stream_fwd.hpp	705	0644	edit dl rm
buffers_iterator.hpp	14049	0644	edit dl rm
completion_condition.hpp	5500	0644	edit dl rm
compose.hpp	4596	0644	edit dl rm
connect.hpp	43157	0644	edit dl rm
coroutine.hpp	9897	0644	edit dl rm
co_spawn.hpp	14509	0644	edit dl rm
deadline_timer.hpp	1138	0644	edit dl rm
defer.hpp	5070	0644	edit dl rm
detached.hpp	3517	0644	edit dl rm
dispatch.hpp	4537	0644	edit dl rm
error.hpp	10351	0644	edit dl rm
execution.hpp	1871	0644	edit dl rm
execution_context.hpp	14341	0644	edit dl rm
executor.hpp	10467	0644	edit dl rm
executor_work_guard.hpp	8039	0644	edit dl rm
handler_alloc_hook.hpp	3471	0644	edit dl rm
handler_continuation_hook.hpp	1474	0644	edit dl rm
handler_invoke_hook.hpp	3744	0644	edit dl rm
high_resolution_timer.hpp	1394	0644	edit dl rm
io_context.hpp	55226	0644	edit dl rm
io_context_strand.hpp	13706	0644	edit dl rm
io_service.hpp	861	0644	edit dl rm
io_service_strand.hpp	575	0644	edit dl rm
is_applicable_property.hpp	1605	0644	edit dl rm
is_executor.hpp	1306	0644	edit dl rm
is_read_buffered.hpp	1646	0644	edit dl rm
is_write_buffered.hpp	1667	0644	edit dl rm
multiple_exceptions.hpp	1631	0644	edit dl rm
packaged_task.hpp	3358	0644	edit dl rm
placeholders.hpp	4146	0644	edit dl rm
post.hpp	4760	0644	edit dl rm
prefer.hpp	18821	0644	edit dl rm
query.hpp	8323	0644	edit dl rm
read.hpp	53894	0644	edit dl rm
read_at.hpp	27766	0644	edit dl rm
read_until.hpp	119477	0644	edit dl rm
redirect_error.hpp	1938	0644	edit dl rm
require.hpp	14926	0644	edit dl rm
require_concept.hpp	9218	0644	edit dl rm
serial_port.hpp	1010	0644	edit dl rm
serial_port_base.hpp	4975	0644	edit dl rm
signal_set.hpp	748	0644	edit dl rm
socket_base.hpp	15939	0644	edit dl rm
spawn.hpp	11793	0644	edit dl rm
ssl.hpp	848	0644	edit dl rm
static_thread_pool.hpp	826	0644	edit dl rm
steady_timer.hpp	1306	0644	edit dl rm
strand.hpp	17193	0644	edit dl rm
streambuf.hpp	826	0644	edit dl rm
system_context.hpp	2649	0644	edit dl rm
system_executor.hpp	22529	0644	edit dl rm
system_timer.hpp	1306	0644	edit dl rm
this_coro.hpp	1149	0644	edit dl rm
thread_pool.hpp	37567	0644	edit dl rm
time_traits.hpp	2281	0644	edit dl rm
unyield.hpp	381	0644	edit dl rm
uses_executor.hpp	2348	0644	edit dl rm
use_awaitable.hpp	5821	0644	edit dl rm
use_future.hpp	4820	0644	edit dl rm
version.hpp	686	0644	edit dl rm
wait_traits.hpp	1451	0644	edit dl rm
write.hpp	52959	0644	edit dl rm
write_at.hpp	29514	0644	edit dl rm
yield.hpp	482	0644	edit dl rm

Edit: /usr/include/boost/asio/execution_context.hpp (14341B)

//
// execution_context.hpp
// ~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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 BOOST_ASIO_EXECUTION_CONTEXT_HPP
#define BOOST_ASIO_EXECUTION_CONTEXT_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include <boost/asio/detail/config.hpp>
#include <cstddef>
#include <stdexcept>
#include <typeinfo>
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/variadic_templates.hpp>

#include <boost/asio/detail/push_options.hpp>

namespace boost {
namespace asio {

class execution_context;
class io_context;

#if !defined(GENERATING_DOCUMENTATION)
template <typename Service> Service& use_service(execution_context&);
template <typename Service> Service& use_service(io_context&);
template <typename Service> void add_service(execution_context&, Service*);
template <typename Service> bool has_service(execution_context&);
#endif // !defined(GENERATING_DOCUMENTATION)

namespace detail { class service_registry; }

/// A context for function object execution.
/**
 * An execution context represents a place where function objects will be
 * executed. An @c io_context is an example of an execution context.
 *
 * @par The execution_context class and services
 *
 * Class execution_context implements an extensible, type-safe, polymorphic set
 * of services, indexed by service type.
 *
 * Services exist to manage the resources that are shared across an execution
 * context. For example, timers may be implemented in terms of a single timer
 * queue, and this queue would be stored in a service.
 *
 * Access to the services of an execution_context is via three function
 * templates, use_service(), add_service() and has_service().
 *
 * In a call to @c use_service<Service>(), the type argument chooses a service,
 * making available all members of the named type. If @c Service is not present
 * in an execution_context, an object of type @c Service is created and added
 * to the execution_context. A C++ program can check if an execution_context
 * implements a particular service with the function template @c
 * has_service<Service>().
 *
 * Service objects may be explicitly added to an execution_context using the
 * function template @c add_service<Service>(). If the @c Service is already
 * present, the service_already_exists exception is thrown. If the owner of the
 * service is not the same object as the execution_context parameter, the
 * invalid_service_owner exception is thrown.
 *
 * Once a service reference is obtained from an execution_context object by
 * calling use_service(), that reference remains usable as long as the owning
 * execution_context object exists.
 *
 * All service implementations have execution_context::service as a public base
 * class. Custom services may be implemented by deriving from this class and
 * then added to an execution_context using the facilities described above.
 *
 * @par The execution_context as a base class
 *
 * Class execution_context may be used only as a base class for concrete
 * execution context types. The @c io_context is an example of such a derived
 * type.
 *
 * On destruction, a class that is derived from execution_context must perform
 * <tt>execution_context::shutdown()</tt> followed by
 * <tt>execution_context::destroy()</tt>.
 *
 * This destruction sequence permits programs to simplify their resource
 * management by using @c shared_ptr<>. Where an object's lifetime is tied to
 * the lifetime of a connection (or some other sequence of asynchronous
 * operations), a @c shared_ptr to the object would be bound into the handlers
 * for all asynchronous operations associated with it. This works as follows:
 *
 * @li When a single connection ends, all associated asynchronous operations
 * complete. The corresponding handler objects are destroyed, and all @c
 * shared_ptr references to the objects are destroyed.
 *
 * @li To shut down the whole program, the io_context function stop() is called
 * to terminate any run() calls as soon as possible. The io_context destructor
 * calls @c shutdown() and @c destroy() to destroy all pending handlers,
 * causing all @c shared_ptr references to all connection objects to be
 * destroyed.
 */
class execution_context
  : private noncopyable
{
public:
  class id;
  class service;

public:
  /// Constructor.
  BOOST_ASIO_DECL execution_context();

/// Destructor.
  BOOST_ASIO_DECL ~execution_context();

protected:
  /// Shuts down all services in the context.
  /**
   * This function is implemented as follows:
   *
   * @li For each service object @c svc in the execution_context set, in
   * reverse order of the beginning of service object lifetime, performs @c
   * svc->shutdown().
   */
  BOOST_ASIO_DECL void shutdown();

/// Destroys all services in the context.
  /**
   * This function is implemented as follows:
   *
   * @li For each service object @c svc in the execution_context set, in
   * reverse order * of the beginning of service object lifetime, performs
   * <tt>delete static_cast<execution_context::service*>(svc)</tt>.
   */
  BOOST_ASIO_DECL void destroy();

public:
  /// Fork-related event notifications.
  enum fork_event
  {
    /// Notify the context that the process is about to fork.
    fork_prepare,

/// Notify the context that the process has forked and is the parent.
    fork_parent,

/// Notify the context that the process has forked and is the child.
    fork_child
  };

/// Notify the execution_context of a fork-related event.
  /**
   * This function is used to inform the execution_context that the process is
   * about to fork, or has just forked. This allows the execution_context, and
   * the services it contains, to perform any necessary housekeeping to ensure
   * correct operation following a fork.
   *
   * This function must not be called while any other execution_context
   * function, or any function associated with the execution_context's derived
   * class, is being called in another thread. It is, however, safe to call
   * this function from within a completion handler, provided no other thread
   * is accessing the execution_context or its derived class.
   *
   * @param event A fork-related event.
   *
   * @throws boost::system::system_error Thrown on failure. If the notification
   * fails the execution_context object should no longer be used and should be
   * destroyed.
   *
   * @par Example
   * The following code illustrates how to incorporate the notify_fork()
   * function:
   * @code my_execution_context.notify_fork(execution_context::fork_prepare);
   * if (fork() == 0)
   * {
   *   // This is the child process.
   *   my_execution_context.notify_fork(execution_context::fork_child);
   * }
   * else
   * {
   *   // This is the parent process.
   *   my_execution_context.notify_fork(execution_context::fork_parent);
   * } @endcode
   *
   * @note For each service object @c svc in the execution_context set,
   * performs <tt>svc->notify_fork();</tt>. When processing the fork_prepare
   * event, services are visited in reverse order of the beginning of service
   * object lifetime. Otherwise, services are visited in order of the beginning
   * of service object lifetime.
   */
  BOOST_ASIO_DECL void notify_fork(fork_event event);

/// Obtain the service object corresponding to the given type.
  /**
   * This function is used to locate a service object that corresponds to the
   * given service type. If there is no existing implementation of the service,
   * then the execution_context will create a new instance of the service.
   *
   * @param e The execution_context object that owns the service.
   *
   * @return The service interface implementing the specified service type.
   * Ownership of the service interface is not transferred to the caller.
   */
  template <typename Service>
  friend Service& use_service(execution_context& e);

/// Obtain the service object corresponding to the given type.
  /**
   * This function is used to locate a service object that corresponds to the
   * given service type. If there is no existing implementation of the service,
   * then the io_context will create a new instance of the service.
   *
   * @param ioc The io_context object that owns the service.
   *
   * @return The service interface implementing the specified service type.
   * Ownership of the service interface is not transferred to the caller.
   *
   * @note This overload is preserved for backwards compatibility with services
   * that inherit from io_context::service.
   */
  template <typename Service>
  friend Service& use_service(io_context& ioc);

#if defined(GENERATING_DOCUMENTATION)

/// Creates a service object and adds it to the execution_context.
  /**
   * This function is used to add a service to the execution_context.
   *
   * @param e The execution_context object that owns the service.
   *
   * @param args Zero or more arguments to be passed to the service
   * constructor.
   *
   * @throws boost::asio::service_already_exists Thrown if a service of the
   * given type is already present in the execution_context.
   */
  template <typename Service, typename... Args>
  friend Service& make_service(execution_context& e, Args&&... args);

#elif defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)

template <typename Service, typename... Args>
  friend Service& make_service(execution_context& e,
      BOOST_ASIO_MOVE_ARG(Args)... args);

#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)

template <typename Service>
  friend Service& make_service(execution_context& e);

#define BOOST_ASIO_PRIVATE_MAKE_SERVICE_DEF(n) \
  template <typename Service, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
  friend Service& make_service(execution_context& e, \
      BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)); \
  /**/
  BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_MAKE_SERVICE_DEF)
#undef BOOST_ASIO_PRIVATE_MAKE_SERVICE_DEF

#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)

/// (Deprecated: Use make_service().) Add a service object to the
  /// execution_context.
  /**
   * This function is used to add a service to the execution_context.
   *
   * @param e The execution_context object that owns the service.
   *
   * @param svc The service object. On success, ownership of the service object
   * is transferred to the execution_context. When the execution_context object
   * is destroyed, it will destroy the service object by performing: @code
   * delete static_cast<execution_context::service*>(svc) @endcode
   *
   * @throws boost::asio::service_already_exists Thrown if a service of the
   * given type is already present in the execution_context.
   *
   * @throws boost::asio::invalid_service_owner Thrown if the service's owning
   * execution_context is not the execution_context object specified by the
   * @c e parameter.
   */
  template <typename Service>
  friend void add_service(execution_context& e, Service* svc);

/// Determine if an execution_context contains a specified service type.
  /**
   * This function is used to determine whether the execution_context contains a
   * service object corresponding to the given service type.
   *
   * @param e The execution_context object that owns the service.
   *
   * @return A boolean indicating whether the execution_context contains the
   * service.
   */
  template <typename Service>
  friend bool has_service(execution_context& e);

private:
  // The service registry.
  boost::asio::detail::service_registry* service_registry_;
};

/// Class used to uniquely identify a service.
class execution_context::id
  : private noncopyable
{
public:
  /// Constructor.
  id() {}
};

/// Base class for all io_context services.
class execution_context::service
  : private noncopyable
{
public:
  /// Get the context object that owns the service.
  execution_context& context();

protected:
  /// Constructor.
  /**
   * @param owner The execution_context object that owns the service.
   */
  BOOST_ASIO_DECL service(execution_context& owner);

/// Destructor.
  BOOST_ASIO_DECL virtual ~service();

private:
  /// Destroy all user-defined handler objects owned by the service.
  virtual void shutdown() = 0;

/// Handle notification of a fork-related event to perform any necessary
  /// housekeeping.
  /**
   * This function is not a pure virtual so that services only have to
   * implement it if necessary. The default implementation does nothing.
   */
  BOOST_ASIO_DECL virtual void notify_fork(
      execution_context::fork_event event);

friend class boost::asio::detail::service_registry;
  struct key
  {
    key() : type_info_(0), id_(0) {}
    const std::type_info* type_info_;
    const execution_context::id* id_;
  } key_;

execution_context& owner_;
  service* next_;
};

/// Exception thrown when trying to add a duplicate service to an
/// execution_context.
class service_already_exists
  : public std::logic_error
{
public:
  BOOST_ASIO_DECL service_already_exists();
};

/// Exception thrown when trying to add a service object to an
/// execution_context where the service has a different owner.
class invalid_service_owner
  : public std::logic_error
{
public:
  BOOST_ASIO_DECL invalid_service_owner();
};

namespace detail {

// Special derived service id type to keep classes header-file only.
template <typename Type>
class service_id
  : public execution_context::id
{
};

// Special service base class to keep classes header-file only.
template <typename Type>
class execution_context_service_base
  : public execution_context::service
{
public:
  static service_id<Type> id;

// Constructor.
  execution_context_service_base(execution_context& e)
    : execution_context::service(e)
  {
  }
};

template <typename Type>
service_id<Type> execution_context_service_base<Type>::id;

} // namespace detail
} // namespace asio
} // namespace boost

#include <boost/asio/detail/pop_options.hpp>

#include <boost/asio/impl/execution_context.hpp>
#if defined(BOOST_ASIO_HEADER_ONLY)
# include <boost/asio/impl/execution_context.ipp>
#endif // defined(BOOST_ASIO_HEADER_ONLY)

#endif // BOOST_ASIO_EXECUTION_CONTEXT_HPP

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