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/*
* Copyright (C) 2012 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained from Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* @file mali_osk_wait_queue.c
* Implemenation of the OS abstraction layer for the kernel device driver
*/
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include "mali_osk.h"
#include "mali_kernel_common.h"
struct _mali_osk_wait_queue_t_struct
{
wait_queue_head_t wait_queue;
};
_mali_osk_wait_queue_t* _mali_osk_wait_queue_init( void )
{
_mali_osk_wait_queue_t* ret = NULL;
ret = kmalloc(sizeof(_mali_osk_wait_queue_t), GFP_KERNEL);
if (NULL == ret)
{
return ret;
}
init_waitqueue_head(&ret->wait_queue);
MALI_DEBUG_ASSERT(!waitqueue_active(&ret->wait_queue));
return ret;
}
void _mali_osk_wait_queue_wait_event( _mali_osk_wait_queue_t *queue, mali_bool (*condition)(void) )
{
MALI_DEBUG_ASSERT_POINTER( queue );
MALI_DEBUG_PRINT(6, ("Adding to wait queue %p\n", queue));
wait_event(queue->wait_queue, condition());
}
void _mali_osk_wait_queue_wake_up( _mali_osk_wait_queue_t *queue )
{
MALI_DEBUG_ASSERT_POINTER( queue );
/* if queue is empty, don't attempt to wake up its elements */
if (!waitqueue_active(&queue->wait_queue)) return;
MALI_DEBUG_PRINT(6, ("Waking up elements in wait queue %p ....\n", queue));
wake_up_all(&queue->wait_queue);
MALI_DEBUG_PRINT(6, ("... elements in wait queue %p woken up\n", queue));
}
void _mali_osk_wait_queue_term( _mali_osk_wait_queue_t *queue )
{
/* Parameter validation */
MALI_DEBUG_ASSERT_POINTER( queue );
/* Linux requires no explicit termination of wait queues */
kfree(queue);
}
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