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/*
* Copyright (C) 2010 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* 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 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include <unistd.h>
#include <fcntl.h>
#include "event_queue.h"
#include <debug.h>
#include <threading/mutex.h>
#include <utils/linked_list.h>
typedef struct private_event_queue_t private_event_queue_t;
/**
* Private data of event_queue_t class.
*/
struct private_event_queue_t {
/**
* Public event_queue_t interface.
*/
event_queue_t public;
/**
* List of queued events (event_t*).
*/
linked_list_t *events;
/**
* Mutex for event list.
*/
mutex_t *mutex;
/**
* Read end of the notification pipe.
*/
int read_fd;
/**
* Write end of the notification pipe.
*/
int write_fd;
};
typedef struct event_t event_t;
struct event_t {
/**
* Callback function.
*/
void (*callback)(void *data);
/**
* Data to supply to the callback.
*/
void *data;
/**
* Cleanup function.
*/
void (*cleanup)(void *data);
};
static event_t *event_create(void (*callback)(void *data), void *data,
void (*cleanup)(void *data))
{
event_t *this;
INIT(this,
.callback = callback,
.data = data,
.cleanup = cleanup,
);
return this;
}
static void event_destroy(event_t *this)
{
if (this->cleanup)
{
this->cleanup(this->data);
}
free(this);
}
METHOD(event_queue_t, get_event_fd, int,
private_event_queue_t *this)
{
return this->read_fd;
}
METHOD(event_queue_t, handle, void,
private_event_queue_t *this)
{
char buf[10];
linked_list_t *events;
event_t *event;
this->mutex->lock(this->mutex);
/* flush pipe */
while (read(this->read_fd, &buf, sizeof(buf)) == sizeof(buf));
/* replace the list, so we can unlock the mutex while executing the jobs */
events = this->events;
this->events = linked_list_create();
this->mutex->unlock(this->mutex);
while (events->remove_first(events, (void**)&event) == SUCCESS)
{
event->callback(event->data);
event_destroy(event);
}
events->destroy(events);
}
METHOD(event_queue_t, queue, void,
private_event_queue_t *this, void (*callback)(void *data), void *data,
void (*cleanup)(void *data))
{
event_t *event = event_create(callback, data, cleanup);
char c = 0;
this->mutex->lock(this->mutex);
this->events->insert_last(this->events, event);
ignore_result(write(this->write_fd, &c, 1));
this->mutex->unlock(this->mutex);
}
METHOD(event_queue_t, destroy, void,
private_event_queue_t *this)
{
this->mutex->lock(this->mutex);
this->events->destroy_function(this->events, (void*)event_destroy);
this->mutex->unlock(this->mutex);
this->mutex->destroy(this->mutex);
close(this->read_fd);
close(this->write_fd);
free(this);
}
static bool set_nonblock(int socket)
{
int flags = fcntl(socket, F_GETFL);
return flags != -1 && fcntl(socket, F_SETFL, flags | O_NONBLOCK) != -1;
}
static bool set_cloexec(int socket)
{
int flags = fcntl(socket, F_GETFD);
return flags != -1 && fcntl(socket, F_SETFD, flags | FD_CLOEXEC) != -1;
}
/*
* Described in header.
*/
event_queue_t *event_queue_create()
{
private_event_queue_t *this;
int fd[2];
INIT(this,
.public = {
.get_event_fd = _get_event_fd,
.handle = _handle,
.queue = _queue,
.destroy = _destroy,
},
.events = linked_list_create(),
.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
);
if (pipe(fd) == -1 ||
!set_nonblock(fd[0]) || !set_cloexec(fd[0]) ||
!set_nonblock(fd[1]) || !set_cloexec(fd[1]))
{
DBG1(DBG_JOB, "failed to create pipe for job queue");
_destroy(this);
return NULL;
}
this->read_fd = fd[0];
this->write_fd = fd[1];
return &this->public;
}
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