mirror of
https://github.com/psycopg/psycopg2.git
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76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
/* green.c - cooperation with coroutine libraries.
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*
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* Copyright (C) 2010 Daniele Varrazzo <daniele.varrazzo@gmail.com>
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*
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* This file is part of psycopg.
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*
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* psycopg2 is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link this program with the OpenSSL library (or with
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* modified versions of OpenSSL that use the same license as OpenSSL),
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* and distribute linked combinations including the two.
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*
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* You must obey the GNU Lesser General Public License in all respects for
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* all of the code used other than OpenSSL.
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*
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* psycopg2 is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*/
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#ifndef PSYCOPG_GREEN_H
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#define PSYCOPG_GREEN_H 1
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#include <libpq-fe.h>
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#include "psycopg/connection.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define psyco_set_wait_callback_doc \
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"Register a callback function to block waiting for data.\n" \
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"\n" \
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"The callback should have signature :samp:`fun({conn})` and\n" \
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"is called to wait for data available whenever a blocking function from the\n" \
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"libpq is called. Use `!set_wait_callback(None)` to revert to the\n" \
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"original behaviour (i.e. using blocking libpq functions).\n" \
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"\n" \
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"The function is an hook to allow coroutine-based libraries (such as\n" \
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"Eventlet_ or gevent_) to switch when Psycopg is blocked, allowing\n" \
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"other coroutines to run concurrently.\n" \
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"\n" \
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"See `~psycopg2.extras.wait_select()` for an example of a wait callback\n" \
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"implementation.\n" \
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"\n" \
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".. _Eventlet: http://eventlet.net/\n" \
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".. _gevent: http://www.gevent.org/\n"
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HIDDEN PyObject *psyco_set_wait_callback(PyObject *self, PyObject *obj);
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#define psyco_get_wait_callback_doc \
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"Return the currently registered wait callback.\n" \
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"\n" \
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"Return `!None` if no callback is currently registered.\n"
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HIDDEN PyObject *psyco_get_wait_callback(PyObject *self, PyObject *obj);
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HIDDEN int psyco_green(void);
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HIDDEN int psyco_wait(connectionObject *conn);
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HIDDEN PGresult *psyco_exec_green(connectionObject *conn, const char *command);
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#define EXC_IF_GREEN(cmd) \
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if (psyco_green()) { \
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PyErr_SetString(ProgrammingError, #cmd " cannot be used " \
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"with an asynchronous callback."); \
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return NULL; }
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#ifdef __cplusplus
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}
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#endif
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#endif /* !defined(PSYCOPG_GREEN_H) */
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