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/*
* liburtc
* Copyright (C) 2019 Chris Hiszpanski
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/**
* @file runloop.h
* Event loop
* A more elaborate file description.
*/
#ifndef URTC_RUNLOOP_H
#define URTC_RUNLOOP_H
#ifdef __cplusplus
extern "C" {
#endif
#include <poll.h>
#include <pthread.h>
#include <stdbool.h>
typedef void *(*callback_t)(int fd, void *arg);
typedef struct {
// File descriptor sets for poll().
struct pollfd *fds;
nfds_t nfds;
// Callback array. Index into array is file descriptor.
callback_t *callbacks;
void **args;
// Pipe for aborting blocked poll(). Allows dynamic adds/removes.
int abortpipe[2];
bool done;
// Run loop thread ID
pthread_t tid;
} runloop_t;
/**
* Create a new run loop
*
* Each run loop creates a separate thread which then repeatedly poll()s
* for events. Upon receiving an event, the run loop calls the respective
* file descriptor's callback function.
*
* @param[out] rl Pointer to run loop struct
*/
int urtc__runloop_create(runloop_t *rl);
/**
* Add file descriptor to run loop
*
* @param rl Run loop
* @param fd File descriptor
* @param events Events to monitor (see struct pollfd)
* @param cb Callback to run on activity
* @param arg User-specified argument to pass to callback
*
* @return Zero on success. Negative on error.
*/
int urtc__runloop_add(
runloop_t *rl,
int fd,
short events,
void *(*cb)(int fd, void *arg),
void *arg
);
/**
* Remove a file descriptor from the run loop. No more events will be
* processed for this file descriptor.
*
* @param rl Run loop.
* @param fd File descriptor.
*
* @return Zero on success. Negative on error.
*/
int urtc__runloop_remove(runloop_t *rl, int fd);
int urtc__runloop_join(runloop_t *rl);
/**
* Destroy a run loop
*
* @param rl Pointer to run loop object
*
* @return Zero on success; negative on error. On error, errno is set.
*/
int urtc__runloop_destroy(runloop_t *rl);
#ifdef __cplusplus
}
#endif
#endif /* URTC_RUNLOOP_H */
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