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-/*
- Copyright (c) 2007-2009 FastMQ Inc.
-
- This file is part of 0MQ.
-
- 0MQ is free software; you can redistribute it and/or modify it under
- the terms of the Lesser GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- 0MQ 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
- Lesser GNU General Public License for more details.
-
- You should have received a copy of the Lesser GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_H_INCLUDED__
-#define __ZMQ_H_INCLUDED__
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include <stddef.h>
-
-#if defined ZMQ_BUILDING_LIBZMQ_WITH_MSVC
-#define ZMQ_EXPORT __declspec(dllexport)
-#else
-#define ZMQ_EXPORT
-#endif
-
-// Maximal size of "Very Small Message". VSMs are passed by value
-// to avoid excessive memory allocation/deallocation.
-// If VMSs larger than 255 bytes are required, type of 'vsm_size'
-// field in zmq_msg_t structure should be modified accordingly.
-#define ZMQ_MAX_VSM_SIZE 30
-
-// Message & notification types.
-#define ZMQ_GAP 1
-#define ZMQ_DELIMITER 31
-#define ZMQ_VSM 32
-
-// Socket options.
-#define ZMQ_HWM 1 // int64_t
-#define ZMQ_LWM 2 // int64_t
-#define ZMQ_SWAP 3 // int64_t
-#define ZMQ_AFFINITY 4 // int64_t
-#define ZMQ_IDENTITY 5 // string
-#define ZMQ_SUBSCRIBE 6 // string
-#define ZMQ_UNSUBSCRIBE 7 // string
-#define ZMQ_RATE 8 // int64_t
-#define ZMQ_RECOVERY_IVL 9 // int64_t
-#define ZMQ_MCAST_LOOP 10 // int64_t
-
-// The operation should be performed in non-blocking mode. I.e. if it cannot
-// be processed immediately, error should be returned with errno set to EAGAIN.
-#define ZMQ_NOBLOCK 1
-
-// zmq_send should not flush the message downstream immediately. Instead, it
-// should batch ZMQ_NOFLUSH messages and send them downstream only if zmq_flush
-// is invoked. This is an optimisation for cases where several messages are
-// sent in a single business transaction. However, the effect is measurable
-// only in extremely high-perf scenarios (million messages a second or so).
-// If that's not your case, use standard flushing send instead. See exchange
-// example for illustration of ZMQ_NOFLUSH functionality.
-#define ZMQ_NOFLUSH 2
-
-// Socket to communicate with a single peer. Allows for a singe connect or a
-// single accept. There's no message routing or message filtering involved.
-#define ZMQ_P2P 0
-
-// Socket to distribute data. Recv fuction is not implemented for this socket
-// type. Messages are distributed in fanout fashion to all peers.
-#define ZMQ_PUB 1
-
-// Socket to subscribe to distributed data. Send function is not implemented
-// for this socket type. However, subscribe function can be used to modify the
-// message filter.
-#define ZMQ_SUB 2
-
-// Socket to send requests on and receive replies from. Requests are
-// load-balanced among all the peers. This socket type doesn't allow for more
-// recv's that there were send's.
-#define ZMQ_REQ 3
-
-// Socket to receive requests from and send replies to. This socket type allows
-// only an alternated sequence of recv's and send's. Each send is routed to
-// the peer that the previous recv delivered message from.
-#define ZMQ_REP 4
-
-// Prototype for the message body deallocation functions.
-// It is deliberately defined in the way to comply with standard C free.
-typedef void (zmq_free_fn) (void *data);
-
-// A message. If 'shared' is true, message content pointed to by 'content'
-// is shared, i.e. reference counting is used to manage its lifetime
-// rather than straighforward malloc/free. struct zmq_msg_content is
-// not declared in the API.
-struct zmq_msg_t
-{
- void *content;
- unsigned char shared;
- unsigned char vsm_size;
- unsigned char vsm_data [ZMQ_MAX_VSM_SIZE];
-};
-
-// Initialise an empty message (zero bytes long).
-ZMQ_EXPORT int zmq_msg_init (struct zmq_msg_t *msg);
-
-// Initialise a message 'size' bytes long.
-//
-// Errors: ENOMEM - the size is too large to allocate.
-ZMQ_EXPORT int zmq_msg_init_size (struct zmq_msg_t *msg, size_t size);
-
-// Initialise a message from an existing buffer. Message isn't copied,
-// instead 0MQ infrastructure take ownership of the buffer and call
-// deallocation functio (ffn) once it's not needed anymore.
-ZMQ_EXPORT int zmq_msg_init_data (struct zmq_msg_t *msg, void *data,
- size_t size, zmq_free_fn *ffn);
-
-// Deallocate the message.
-ZMQ_EXPORT int zmq_msg_close (struct zmq_msg_t *msg);
-
-// Move the content of the message from 'src' to 'dest'. The content isn't
-// copied, just moved. 'src' is an empty message after the call. Original
-// content of 'dest' message is deallocated.
-ZMQ_EXPORT int zmq_msg_move (struct zmq_msg_t *dest, struct zmq_msg_t *src);
-
-// Copy the 'src' message to 'dest'. The content isn't copied, instead
-// reference count is increased. Don't modify the message data after the
-// call as they are shared between two messages. Original content of 'dest'
-// message is deallocated.
-ZMQ_EXPORT int zmq_msg_copy (struct zmq_msg_t *dest, struct zmq_msg_t *src);
-
-// Returns pointer to message data.
-ZMQ_EXPORT void *zmq_msg_data (struct zmq_msg_t *msg);
-
-// Return size of message data (in bytes).
-ZMQ_EXPORT size_t zmq_msg_size (struct zmq_msg_t *msg);
-
-// Returns type of the message.
-ZMQ_EXPORT int zmq_msg_type (struct zmq_msg_t *msg);
-
-// Initialise 0MQ context. 'app_threads' specifies maximal number
-// of application threads that can have open sockets at the same time.
-// 'io_threads' specifies the size of thread pool to handle I/O operations.
-//
-// Errors: EINVAL - one of the arguments is less than zero or there are no
-// threads declared at all.
-ZMQ_EXPORT void *zmq_init (int app_threads, int io_threads);
-
-// Deinitialise 0MQ context including all the open sockets. Closing
-// sockets after zmq_term has been called will result in undefined behaviour.
-ZMQ_EXPORT int zmq_term (void *context);
-
-// Open a socket.
-//
-// Errors: EINVAL - invalid socket type.
-// EMFILE - the number of application threads entitled to hold open
-// sockets at the same time was exceeded.
-ZMQ_EXPORT void *zmq_socket (void *context, int type);
-
-// Close the socket.
-ZMQ_EXPORT int zmq_close (void *s);
-
-// Sets an option on the socket.
-// EINVAL - unknown option, a value with incorrect length or an invalid value.
-ZMQ_EXPORT int zmq_setsockopt (void *s, int option_, const void *optval_,
- size_t optvallen_);
-
-// Bind the socket to a particular address.
-ZMQ_EXPORT int zmq_bind (void *s, const char *addr);
-
-// Connect the socket to a particular address.
-ZMQ_EXPORT int zmq_connect (void *s, const char *addr);
-
-// Send the message 'msg' to the socket 's'. 'flags' argument can be
-// combination of following values:
-// ZMQ_NOBLOCK - if message cannot be sent, return immediately.
-// ZMQ_NOFLUSH - message won't be sent immediately. It'll be sent with either
-// subsequent flushing send or explicit call to zmq_flush
-// function.
-//
-// Errors: EAGAIN - message cannot be sent at the moment (applies only to
-// non-blocking send).
-// EFAULT - function isn't supported by particular socket type.
-ZMQ_EXPORT int zmq_send (void *s, struct zmq_msg_t *msg, int flags);
-
-// Flush the messages that were send using ZMQ_NOFLUSH flag down the stream.
-//
-// Errors: FAULT - function isn't supported by particular socket type.
-ZMQ_EXPORT int zmq_flush (void *s);
-
-// Send a message from the socket 's'. 'flags' argument can be combination
-// of following values:
-// ZMQ_NOBLOCK - if message cannot be received, return immediately.
-//
-// Errors: EAGAIN - message cannot be received at the moment (applies only to
-// non-blocking receive).
-// EFAULT - function isn't supported by particular socket type.
-ZMQ_EXPORT int zmq_recv (void *s, struct zmq_msg_t *msg, int flags);
-
-// Helper functions used by perf tests so that they don't have to care
-// about minutiae of time-related functions on different OS platforms.
-ZMQ_EXPORT void *zmq_stopwatch_start ();
-ZMQ_EXPORT unsigned long zmq_stopwatch_stop (void *watch_);
-ZMQ_EXPORT void zmq_sleep (int seconds_);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif