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authormalosek <malosek@fastmq.com>2009-09-07 17:06:47 +0200
committermalosek <malosek@fastmq.com>2009-09-07 17:06:47 +0200
commitb71c3005e68d02f800ff09bcacece79d167bff75 (patch)
treef8a82fbb1cdc5f20e21da9809ea20c93f16bca56 /c
parentf895426c1885729f4a4a20b1eb543a92915aed85 (diff)
include directory split into c and cpp dirs, added --with-c and --with-cpp configure options
Diffstat (limited to 'c')
-rw-r--r--c/zmq.h206
1 files changed, 206 insertions, 0 deletions
diff --git a/c/zmq.h b/c/zmq.h
new file mode 100644
index 0000000..a8394ed
--- /dev/null
+++ b/c/zmq.h
@@ -0,0 +1,206 @@
+/*
+ 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 MSC_VER && defined ZMQ_BUILDING_LIBZMQ
+#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
+#define ZMQ_LWM 2
+#define ZMQ_SWAP 3
+#define ZMQ_MASK 4
+#define ZMQ_AFFINITY 5
+#define ZMQ_IDENTITY 6
+
+// 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).
+// ENOTSUP - 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: ENOTSUP - 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).
+// ENOTSUP - function isn't supported by particular socket type.
+ZMQ_EXPORT int zmq_recv (void *s, struct zmq_msg_t *msg, int flags);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif