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[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
26 #include "scheduler.h"
27
28 #include "globals.h"
29 #include "utils/allocator.h"
30 #include "queues/job_queue.h"
31
32 /**
33 * Private data of a scheduler object
34 */
35 typedef struct private_scheduler_s private_scheduler_t;
36
37 struct private_scheduler_s {
38 /**
39 * Public part of a scheduler object
40 */
41 scheduler_t public;
42
43 /**
44 * Assigned thread to the scheduler_t object
45 */
46 pthread_t assigned_thread;
47
48 };
49
50 /**
51 * Thread function started at creation of the scheduler object
52 *
53 * @param this assigned scheduler object
54 * @return SUCCESS if thread_function ended successfully, FAILED otherwise
55 */
56 static void scheduler_thread_function(private_scheduler_t * this)
57 {
58 /* cancellation disabled by default */
59 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
60 job_t *current_job;
61
62 for (;;)
63 {
64 /* get a job, this block until one is available */
65 global_event_queue->get(global_event_queue, &current_job);
66 /* queue the job in the job queue, workers will eat them */
67 global_job_queue->add(global_job_queue, current_job);
68 }
69 }
70
71 /**
72 * Implementation of scheduler_t's destroy function
73 */
74 static status_t destroy(private_scheduler_t *this)
75 {
76 pthread_cancel(this->assigned_thread);
77
78 pthread_join(this->assigned_thread, NULL);
79
80 allocator_free(this);
81 return SUCCESS;
82 }
83
84
85 scheduler_t * scheduler_create()
86 {
87 private_scheduler_t *this = allocator_alloc_thing(private_scheduler_t);
88
89 this->public.destroy = (status_t(*)(scheduler_t*)) destroy;
90 if (pthread_create(&(this->assigned_thread), NULL, (void*(*)(void*))scheduler_thread_function, this) != 0)
91 {
92 /* thread could not be created */
93 allocator_free(this);
94 return NULL;
95 }
96
97 return &(this->public);
98 }