/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation, nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "msg_q.h"
#define LOG_TAG "LocSvc_utils_q"
#include "log_util.h"
#include "platform_lib_includes.h"
#include "linked_list.h"
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
typedef struct msg_q {
void* msg_list; /* Linked list to store information */
pthread_cond_t list_cond; /* Condition variable for waiting on msg queue */
pthread_mutex_t list_mutex; /* Mutex for exclusive access to message queue */
int unblocked; /* Has this message queue been unblocked? */
} msg_q;
/*===========================================================================
FUNCTION convert_linked_list_err_type
DESCRIPTION
Converts from one set of enum values to another.
linked_list_val: Value to convert to msg_q_enum_type
DEPENDENCIES
N/A
RETURN VALUE
Corresponding linked_list_enum_type in msg_q_enum_type
SIDE EFFECTS
N/A
===========================================================================*/
static msq_q_err_type convert_linked_list_err_type(linked_list_err_type linked_list_val)
{
switch( linked_list_val )
{
case eLINKED_LIST_SUCCESS:
return eMSG_Q_SUCCESS;
case eLINKED_LIST_INVALID_PARAMETER:
return eMSG_Q_INVALID_PARAMETER;
case eLINKED_LIST_INVALID_HANDLE:
return eMSG_Q_INVALID_HANDLE;
case eLINKED_LIST_UNAVAILABLE_RESOURCE:
return eMSG_Q_UNAVAILABLE_RESOURCE;
case eLINKED_LIST_INSUFFICIENT_BUFFER:
return eMSG_Q_INSUFFICIENT_BUFFER;
case eLINKED_LIST_FAILURE_GENERAL:
default:
return eMSG_Q_FAILURE_GENERAL;
}
}
/* ----------------------- END INTERNAL FUNCTIONS ---------------------------------------- */
/*===========================================================================
FUNCTION: msg_q_init
===========================================================================*/
msq_q_err_type msg_q_init(void** msg_q_data)
{
if( msg_q_data == NULL )
{
LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
return eMSG_Q_INVALID_PARAMETER;
}
msg_q* tmp_msg_q;
tmp_msg_q = (msg_q*)calloc(1, sizeof(msg_q));
if( tmp_msg_q == NULL )
{
LOC_LOGE("%s: Unable to allocate space for message queue!\n", __FUNCTION__);
return eMSG_Q_FAILURE_GENERAL;
}
if( linked_list_init(&tmp_msg_q->msg_list) != 0 )
{
LOC_LOGE("%s: Unable to initialize storage list!\n", __FUNCTION__);
free(tmp_msg_q);
return eMSG_Q_FAILURE_GENERAL;
}
if( pthread_mutex_init(&tmp_msg_q->list_mutex, NULL) != 0 )
{
LOC_LOGE("%s: Unable to initialize list mutex!\n", __FUNCTION__);
linked_list_destroy(&tmp_msg_q->msg_list);
free(tmp_msg_q);
return eMSG_Q_FAILURE_GENERAL;
}
if( pthread_cond_init(&tmp_msg_q->list_cond, NULL) != 0 )
{
LOC_LOGE("%s: Unable to initialize msg q cond var!\n", __FUNCTION__);
linked_list_destroy(&tmp_msg_q->msg_list);
pthread_mutex_destroy(&tmp_msg_q->list_mutex);
free(tmp_msg_q);
return eMSG_Q_FAILURE_GENERAL;
}
tmp_msg_q->unblocked = 0;
*msg_q_data = tmp_msg_q;
return eMSG_Q_SUCCESS;
}
/*===========================================================================
FUNCTION: msg_q_init2
===========================================================================*/
const void* msg_q_init2()
{
void* q = NULL;
if (eMSG_Q_SUCCESS != msg_q_init(&q)) {
q = NULL;
}
return q;
}
/*===========================================================================
FUNCTION: msg_q_destroy
===========================================================================*/
msq_q_err_type msg_q_destroy(void** msg_q_data)
{
if( msg_q_data == NULL )
{
LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
return eMSG_Q_INVALID_HANDLE;
}
msg_q* p_msg_q = (msg_q*)*msg_q_data;
linked_list_destroy(&p_msg_q->msg_list);
pthread_mutex_destroy(&p_msg_q->list_mutex);
pthread_cond_destroy(&p_msg_q->list_cond);
p_msg_q->unblocked = 0;
free(*msg_q_data);
*msg_q_data = NULL;
return eMSG_Q_SUCCESS;
}
/*===========================================================================
FUNCTION: msg_q_snd
===========================================================================*/
msq_q_err_type msg_q_snd(void* msg_q_data, void* msg_obj, void (*dealloc)(void*))
{
msq_q_err_type rv;
if( msg_q_data == NULL )
{
LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
return eMSG_Q_INVALID_HANDLE;
}
if( msg_obj == NULL )
{
LOC_LOGE("%s: Invalid msg_obj parameter!\n", __FUNCTION__);
return eMSG_Q_INVALID_PARAMETER;
}
msg_q* p_msg_q = (msg_q*)msg_q_data;
pthread_mutex_lock(&p_msg_q->list_mutex);
LOC_LOGD("%s: Sending message with handle = 0x%p\n", __FUNCTION__, msg_obj);
if( p_msg_q->unblocked )
{
LOC_LOGE("%s: Message queue has been unblocked.\n", __FUNCTION__);
pthread_mutex_unlock(&p_msg_q->list_mutex);
return eMSG_Q_UNAVAILABLE_RESOURCE;
}
rv = convert_linked_list_err_type(linked_list_add(p_msg_q->msg_list, msg_obj, dealloc));
/* Show data is in the message queue. */
pthread_cond_signal(&p_msg_q->list_cond);
pthread_mutex_unlock(&p_msg_q->list_mutex);
LOC_LOGD("%s: Finished Sending message with handle = 0x%p\n", __FUNCTION__, msg_obj);
return rv;
}
/*===========================================================================
FUNCTION: msg_q_rcv
===========================================================================*/
msq_q_err_type msg_q_rcv(void* msg_q_data, void** msg_obj)
{
msq_q_err_type rv;
if( msg_q_data == NULL )
{
LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
return eMSG_Q_INVALID_HANDLE;
}
if( msg_obj == NULL )
{
LOC_LOGE("%s: Invalid msg_obj parameter!\n", __FUNCTION__);
return eMSG_Q_INVALID_PARAMETER;
}
msg_q* p_msg_q = (msg_q*)msg_q_data;
LOC_LOGD("%s: Waiting on message\n", __FUNCTION__);
pthread_mutex_lock(&p_msg_q->list_mutex);
if( p_msg_q->unblocked )
{
LOC_LOGE("%s: Message queue has been unblocked.\n", __FUNCTION__);
pthread_mutex_unlock(&p_msg_q->list_mutex);
return eMSG_Q_UNAVAILABLE_RESOURCE;
}
/* Wait for data in the message queue */
while( linked_list_empty(p_msg_q->msg_list) && !p_msg_q->unblocked )
{
pthread_cond_wait(&p_msg_q->list_cond, &p_msg_q->list_mutex);
}
rv = convert_linked_list_err_type(linked_list_remove(p_msg_q->msg_list, msg_obj));
pthread_mutex_unlock(&p_msg_q->list_mutex);
LOC_LOGD("%s: Received message 0x%p rv = %d\n", __FUNCTION__, *msg_obj, rv);
return rv;
}
/*===========================================================================
FUNCTION: msg_q_flush
===========================================================================*/
msq_q_err_type msg_q_flush(void* msg_q_data)
{
msq_q_err_type rv;
if ( msg_q_data == NULL )
{
LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
return eMSG_Q_INVALID_HANDLE;
}
msg_q* p_msg_q = (msg_q*)msg_q_data;
LOC_LOGD("%s: Flushing Message Queue\n", __FUNCTION__);
pthread_mutex_lock(&p_msg_q->list_mutex);
/* Remove all elements from the list */
rv = convert_linked_list_err_type(linked_list_flush(p_msg_q->msg_list));
pthread_mutex_unlock(&p_msg_q->list_mutex);
LOC_LOGD("%s: Message Queue flushed\n", __FUNCTION__);
return rv;
}
/*===========================================================================
FUNCTION: msg_q_unblock
===========================================================================*/
msq_q_err_type msg_q_unblock(void* msg_q_data)
{
if ( msg_q_data == NULL )
{
LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
return eMSG_Q_INVALID_HANDLE;
}
msg_q* p_msg_q = (msg_q*)msg_q_data;
pthread_mutex_lock(&p_msg_q->list_mutex);
if( p_msg_q->unblocked )
{
LOC_LOGE("%s: Message queue has been unblocked.\n", __FUNCTION__);
pthread_mutex_unlock(&p_msg_q->list_mutex);
return eMSG_Q_UNAVAILABLE_RESOURCE;
}
LOC_LOGD("%s: Unblocking Message Queue\n", __FUNCTION__);
/* Unblocking message queue */
p_msg_q->unblocked = 1;
/* Allow all the waiters to wake up */
pthread_cond_broadcast(&p_msg_q->list_cond);
pthread_mutex_unlock(&p_msg_q->list_mutex);
LOC_LOGD("%s: Message Queue unblocked\n", __FUNCTION__);
return eMSG_Q_SUCCESS;
}