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/* green.c - cooperation with coroutine libraries.
*
* Copyright (C) 2010 Daniele Varrazzo <daniele.varrazzo@gmail.com>
*
* This file is part of psycopg.
*
* psycopg2 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.
*
* In addition, as a special exception, the copyright holders give
* permission to link this program with the OpenSSL library (or with
* modified versions of OpenSSL that use the same license as OpenSSL),
* and distribute linked combinations including the two.
*
* You must obey the GNU Lesser General Public License in all respects for
* all of the code used other than OpenSSL.
*
* psycopg2 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.
*/
#ifndef PSYCOPG_GREEN_H
#define PSYCOPG_GREEN_H 1
#include <libpq-fe.h>
#include "psycopg/connection.h"
#ifdef __cplusplus
extern "C" {
#endif
#define psyco_set_wait_callback_doc \
"Register a callback function to block waiting for data.\n" \
"\n" \
"The callback should have signature :samp:`fun({conn})` and\n" \
"is called to wait for data available whenever a blocking function from the\n" \
"libpq is called. Use `!set_wait_callback(None)` to revert to the\n" \
"original behaviour (i.e. using blocking libpq functions).\n" \
"\n" \
"The function is an hook to allow coroutine-based libraries (such as\n" \
"Eventlet_ or gevent_) to switch when Psycopg is blocked, allowing\n" \
"other coroutines to run concurrently.\n" \
"\n" \
"See `~psycopg2.extras.wait_select()` for an example of a wait callback\n" \
"implementation.\n" \
"\n" \
".. _Eventlet: https://eventlet.net/\n" \
".. _gevent: http://www.gevent.org/\n"
HIDDEN PyObject *psyco_set_wait_callback(PyObject *self, PyObject *obj);
#define psyco_get_wait_callback_doc \
"Return the currently registered wait callback.\n" \
"\n" \
"Return `!None` if no callback is currently registered.\n"
HIDDEN PyObject *psyco_get_wait_callback(PyObject *self, PyObject *obj);
HIDDEN int psyco_green(void);
HIDDEN int psyco_wait(connectionObject *conn);
HIDDEN PGresult *psyco_exec_green(connectionObject *conn, const char *command);
#define EXC_IF_GREEN(cmd) \
if (psyco_green()) { \
PyErr_SetString(ProgrammingError, #cmd " cannot be used " \
"with an asynchronous callback."); \
return NULL; }
#ifdef __cplusplus
}
#endif
#endif /* !defined(PSYCOPG_GREEN_H) */
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