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-rw-r--r--src/charon/processing/job_queue.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/src/charon/processing/job_queue.c b/src/charon/processing/job_queue.c
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+++ b/src/charon/processing/job_queue.c
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+/**
+ * @file job_queue.c
+ *
+ * @brief Implementation of job_queue_t
+ *
+ */
+
+/*
+ * Copyright (C) 2005-2006 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * 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 <stdlib.h>
+#include <pthread.h>
+
+#include "job_queue.h"
+
+#include <utils/linked_list.h>
+
+
+typedef struct private_job_queue_t private_job_queue_t;
+
+/**
+ * @brief Private Variables and Functions of job_queue class
+ *
+ */
+struct private_job_queue_t {
+
+ /**
+ * public members
+ */
+ job_queue_t public;
+
+ /**
+ * The jobs are stored in a linked list
+ */
+ linked_list_t *list;
+
+ /**
+ * access to linked_list is locked through this mutex
+ */
+ pthread_mutex_t mutex;
+
+ /**
+ * If the queue is empty a thread has to wait
+ * This condvar is used to wake up such a thread
+ */
+ pthread_cond_t condvar;
+};
+
+
+/**
+ * implements job_queue_t.get_count
+ */
+static int get_count(private_job_queue_t *this)
+{
+ int count;
+ pthread_mutex_lock(&(this->mutex));
+ count = this->list->get_count(this->list);
+ pthread_mutex_unlock(&(this->mutex));
+ return count;
+}
+
+/**
+ * implements job_queue_t.get
+ */
+static job_t *get(private_job_queue_t *this)
+{
+ int oldstate;
+ job_t *job;
+ pthread_mutex_lock(&(this->mutex));
+ /* go to wait while no jobs available */
+ while(this->list->get_count(this->list) == 0)
+ {
+ /* add mutex unlock handler for cancellation, enable cancellation */
+ pthread_cleanup_push((void(*)(void*))pthread_mutex_unlock, (void*)&(this->mutex));
+ pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
+
+ pthread_cond_wait( &(this->condvar), &(this->mutex));
+
+ /* reset cancellation, remove mutex-unlock handler (without executing) */
+ pthread_setcancelstate(oldstate, NULL);
+ pthread_cleanup_pop(0);
+ }
+ this->list->remove_first(this->list, (void **)&job);
+ pthread_mutex_unlock(&(this->mutex));
+ return job;
+}
+
+/**
+ * implements function job_queue_t.add
+ */
+static void add(private_job_queue_t *this, job_t *job)
+{
+ pthread_mutex_lock(&(this->mutex));
+ this->list->insert_last(this->list,job);
+ pthread_cond_signal( &(this->condvar));
+ pthread_mutex_unlock(&(this->mutex));
+}
+
+/**
+ * implements job_queue_t.destroy
+ */
+static void job_queue_destroy (private_job_queue_t *this)
+{
+ this->list->destroy_offset(this->list, offsetof(job_t, destroy));
+ free(this);
+}
+
+/*
+ *
+ * Documented in header
+ */
+job_queue_t *job_queue_create(void)
+{
+ private_job_queue_t *this = malloc_thing(private_job_queue_t);
+
+ this->public.get_count = (int(*)(job_queue_t*))get_count;
+ this->public.get = (job_t*(*)(job_queue_t*))get;
+ this->public.add = (void(*)(job_queue_t*, job_t*))add;
+ this->public.destroy = (void(*)(job_queue_t*))job_queue_destroy;
+
+ this->list = linked_list_create();
+ pthread_mutex_init(&(this->mutex), NULL);
+ pthread_cond_init(&(this->condvar), NULL);
+
+ return (&this->public);
+}