102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* uhub - A tiny ADC p2p connection hub
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* Copyright (C) 2007-2014, Jan Vidar Krey
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* 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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#include "uhub.h"
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struct uhub_notify_handle
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{
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net_notify_callback callback;
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void* ptr;
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#ifndef WIN32
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int pipe_fd[2];
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struct net_connection* con;
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#endif
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};
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/*
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* This contains a mechanism to wake up the main thread
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* in a thread safe manner while it would be blocking
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* in select() or something equivalent typically invoked from
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* net_backend_process().
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*
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* The main usage is for the DNS resolver to notify the
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* main thread that there are DNS results to be
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* processed.
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*/
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/**
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* Create a notification handle.
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*/
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#ifndef WIN32
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static void notify_callback(struct net_connection* con, int event, void* ptr)
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{
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LOG_TRACE("notify_callback()");
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struct uhub_notify_handle* handle = (struct uhub_notify_handle*) ptr;
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char buf;
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int ret = read(handle->pipe_fd[0], &buf, 1);
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if (ret == 1)
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{
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if (handle->callback)
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handle->callback(handle, handle->ptr);
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}
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}
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#endif
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struct uhub_notify_handle* net_notify_create(net_notify_callback cb, void* ptr)
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{
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LOG_TRACE("net_notify_create()");
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struct uhub_notify_handle* handle = (struct uhub_notify_handle*) hub_malloc(sizeof(struct uhub_notify_handle));
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handle->callback = cb;
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handle->ptr = ptr;
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#ifndef WIN32
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int ret = pipe(handle->pipe_fd);
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if (ret == -1)
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{
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LOG_ERROR("Unable to setup notification pipes.");
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hub_free(handle);
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return 0;
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}
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handle->con = net_con_create();
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net_con_initialize(handle->con, handle->pipe_fd[0], notify_callback, handle, NET_EVENT_READ);
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#endif
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return handle;
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}
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void net_notify_destroy(struct uhub_notify_handle* handle)
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{
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LOG_TRACE("net_notify_destroy()");
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#ifndef WIN32
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net_con_destroy(handle->con);
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close(handle->pipe_fd[0]);
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close(handle->pipe_fd[1]);
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handle->pipe_fd[0] = -1;
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handle->pipe_fd[0] = -1;
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#endif
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hub_free(handle);
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}
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void net_notify_signal(struct uhub_notify_handle* handle, char data)
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{
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LOG_TRACE("net_notify_signal()");
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#ifndef WIN32
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write(handle->pipe_fd[1], &data, 1);
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#endif
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} |