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/*
Copyright (c) 2009-2012 250bpm s.r.o.
Copyright (c) 2007-2009 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads project.
Crossroads is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Crossroads is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __XS_CTX_HPP_INCLUDED__
#define __XS_CTX_HPP_INCLUDED__
#include <map>
#include <vector>
#include <string>
#include <stdarg.h>
#include "mailbox.hpp"
#include "array.hpp"
#include "config.hpp"
#include "mutex.hpp"
#include "stdint.hpp"
#include "options.hpp"
#include "atomic_counter.hpp"
namespace xs
{
class object_t;
class monitor_t;
class io_thread_t;
class socket_base_t;
class reaper_t;
// Information associated with inproc endpoint. Note that endpoint options
// are registered as well so that the peer can access them without a need
// for synchronisation, handshaking or similar.
struct endpoint_t
{
class socket_base_t *socket;
options_t options;
};
// Context object encapsulates all the global state associated with
// the library.
class ctx_t
{
public:
// Create the context object. The argument specifies the size
// of I/O thread pool to create.
ctx_t (uint32_t io_threads_);
// Returns false if object is not a context.
bool check_tag ();
// This function is called when user invokes xs_term. If there are
// no more sockets open it'll cause all the infrastructure to be shut
// down. If there are open sockets still, the deallocation happens
// after the last one is closed.
int terminate ();
// Set context option.
int setctxopt (int option_, const void *optval_, size_t optvallen_);
// Create and destroy a socket.
xs::socket_base_t *create_socket (int type_);
void destroy_socket (xs::socket_base_t *socket_);
// Send command to the destination thread.
void send_command (uint32_t tid_, const command_t &command_);
// Returns the I/O thread that is the least busy at the moment.
// Affinity specifies which I/O threads are eligible (0 = all).
// Returns NULL is no I/O thread is available.
xs::io_thread_t *choose_io_thread (uint64_t affinity_);
// Returns reaper thread object.
xs::object_t *get_reaper ();
// Management of inproc endpoints.
int register_endpoint (const char *addr_, endpoint_t &endpoint_);
void unregister_endpoints (xs::socket_base_t *socket_);
endpoint_t find_endpoint (const char *addr_);
// Logging related functions.
void log (int sid_, const char *text_);
void publish_logs (const char *text_);
enum {
term_tid = 0,
reaper_tid = 1
};
~ctx_t ();
private:
// Used to check whether the object is a context.
uint32_t tag;
// Sockets belonging to this context. We need the list so that
// we can notify the sockets when xs_term() is called. The sockets
// will return ETERM then.
typedef array_t <socket_base_t> sockets_t;
sockets_t sockets;
// List of unused thread slots.
typedef std::vector <uint32_t> emtpy_slots_t;
emtpy_slots_t empty_slots;
// If true, xs_init has been called but no socket have been created
// yes. Launching of I/O threads is delayed.
bool starting;
// If true, xs_term was already called.
bool terminating;
// Synchronisation of accesses to global slot-related data:
// sockets, empty_slots, terminating. It also synchronises
// access to zombie sockets as such (as oposed to slots) and provides
// a memory barrier to ensure that all CPU cores see the same data.
mutex_t slot_sync;
// The reaper thread.
xs::reaper_t *reaper;
// I/O threads.
typedef std::vector <xs::io_thread_t*> io_threads_t;
io_threads_t io_threads;
// Array of pointers to mailboxes for both application and I/O threads.
uint32_t slot_count;
mailbox_t **slots;
// Mailbox for xs_term thread.
mailbox_t term_mailbox;
// List of inproc endpoints within this context.
typedef std::map <std::string, endpoint_t> endpoints_t;
endpoints_t endpoints;
// Synchronisation of access to the list of inproc endpoints.
mutex_t endpoints_sync;
// Monitor object attached to the context.
xs::monitor_t *monitor;
// Maximum socket ID.
static atomic_counter_t max_socket_id;
// PUB socket for logging. The socket is shared among all the threads,
// thus it is synchronised by a mutex.
xs::socket_base_t *log_socket;
mutex_t log_sync;
// Maximum number of sockets that can be opened at the same time.
int max_sockets;
// Number of I/O threads to launch.
uint32_t io_thread_count;
// Synchronisation of access to context options.
mutex_t opt_sync;
ctx_t (const ctx_t&);
const ctx_t &operator = (const ctx_t&);
};
}
#endif
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