- implemented basic scheduler
[strongswan.git] / Source / charon / scheduler.c
1 /**
2 * @file scheduler.c
3 *
4 * @brief implements the scheduler, looks for jobs in event-queue
5 *
6 */
7
8 /*
9 * Copyright (C) 2005 Jan Hutter, Martin Willi
10 * Hochschule fuer Technik Rapperswil
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 * for more details.
21 */
22
23 #include <stdlib.h>
24 #include <pthread.h>
25 #include <freeswan.h>
26 #include <pluto/constants.h>
27 #include <pluto/defs.h>
28
29 #include "scheduler.h"
30 #include "job_queue.h"
31 #include "globals.h"
32
33 /**
34 * Private data of a scheduler object
35 */
36 typedef struct private_scheduler_s private_scheduler_t;
37
38 struct private_scheduler_s {
39 /**
40 * Public part of a scheduler object
41 */
42 scheduler_t public;
43
44 /**
45 * Assigned thread to the scheduler_t-object
46 */
47 pthread_t assigned_thread;
48
49 };
50
51 /**
52 * Thread function started at creation of the scheduler object
53 *
54 * @param this assigned scheduler object
55 * @return SUCCESS if thread_function ended successfully, FAILED otherwise
56 */
57 static void scheduler_thread_function(private_scheduler_t * this)
58 {
59 /* cancellation disabled by default */
60 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
61 job_t *current_job;
62
63 for (;;)
64 {
65 /* get a job, this block until one is available */
66 global_event_queue->get(global_event_queue, &current_job);
67 /* queue the job in the job queue, workers will eat them */
68 global_job_queue->add(global_job_queue, current_job);
69 }
70 }
71
72 /**
73 * Implementation of scheduler_t's destroy function
74 */
75 static status_t destroy(private_scheduler_t *this)
76 {
77 pthread_cancel(this->assigned_thread);
78
79 pthread_join(this->assigned_thread, NULL);
80
81 pfree(this);
82 return SUCCESS;
83 }
84
85
86 scheduler_t * scheduler_create()
87 {
88 private_scheduler_t *this = alloc_thing(private_scheduler_t,"private_scheduler_t");
89
90 this->public.destroy = (status_t(*)(scheduler_t*)) destroy;
91 if (pthread_create(&(this->assigned_thread), NULL, (void*(*)(void*))scheduler_thread_function, this) != 0)
92 {
93 /* thread could not be created */
94 pfree(this);
95 return NULL;
96 }
97
98 return &(this->public);
99 }