337 lines
9.9 KiB
C
337 lines
9.9 KiB
C
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/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation, nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "msg_q.h"
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#define LOG_TAG "LocSvc_utils_q"
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#include "log_util.h"
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#include "platform_lib_includes.h"
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#include "linked_list.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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typedef struct msg_q {
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void* msg_list; /* Linked list to store information */
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pthread_cond_t list_cond; /* Condition variable for waiting on msg queue */
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pthread_mutex_t list_mutex; /* Mutex for exclusive access to message queue */
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int unblocked; /* Has this message queue been unblocked? */
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} msg_q;
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/*===========================================================================
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FUNCTION convert_linked_list_err_type
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DESCRIPTION
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Converts from one set of enum values to another.
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linked_list_val: Value to convert to msg_q_enum_type
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DEPENDENCIES
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N/A
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RETURN VALUE
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Corresponding linked_list_enum_type in msg_q_enum_type
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SIDE EFFECTS
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N/A
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===========================================================================*/
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static msq_q_err_type convert_linked_list_err_type(linked_list_err_type linked_list_val)
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{
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switch( linked_list_val )
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{
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case eLINKED_LIST_SUCCESS:
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return eMSG_Q_SUCCESS;
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case eLINKED_LIST_INVALID_PARAMETER:
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return eMSG_Q_INVALID_PARAMETER;
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case eLINKED_LIST_INVALID_HANDLE:
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return eMSG_Q_INVALID_HANDLE;
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case eLINKED_LIST_UNAVAILABLE_RESOURCE:
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return eMSG_Q_UNAVAILABLE_RESOURCE;
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case eLINKED_LIST_INSUFFICIENT_BUFFER:
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return eMSG_Q_INSUFFICIENT_BUFFER;
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case eLINKED_LIST_FAILURE_GENERAL:
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default:
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return eMSG_Q_FAILURE_GENERAL;
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}
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}
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/* ----------------------- END INTERNAL FUNCTIONS ---------------------------------------- */
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/*===========================================================================
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FUNCTION: msg_q_init
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===========================================================================*/
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msq_q_err_type msg_q_init(void** msg_q_data)
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{
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if( msg_q_data == NULL )
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{
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LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
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return eMSG_Q_INVALID_PARAMETER;
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}
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msg_q* tmp_msg_q;
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tmp_msg_q = (msg_q*)calloc(1, sizeof(msg_q));
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if( tmp_msg_q == NULL )
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{
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LOC_LOGE("%s: Unable to allocate space for message queue!\n", __FUNCTION__);
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return eMSG_Q_FAILURE_GENERAL;
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}
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if( linked_list_init(&tmp_msg_q->msg_list) != 0 )
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{
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LOC_LOGE("%s: Unable to initialize storage list!\n", __FUNCTION__);
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free(tmp_msg_q);
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return eMSG_Q_FAILURE_GENERAL;
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}
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if( pthread_mutex_init(&tmp_msg_q->list_mutex, NULL) != 0 )
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{
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LOC_LOGE("%s: Unable to initialize list mutex!\n", __FUNCTION__);
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linked_list_destroy(&tmp_msg_q->msg_list);
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free(tmp_msg_q);
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return eMSG_Q_FAILURE_GENERAL;
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}
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if( pthread_cond_init(&tmp_msg_q->list_cond, NULL) != 0 )
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{
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LOC_LOGE("%s: Unable to initialize msg q cond var!\n", __FUNCTION__);
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linked_list_destroy(&tmp_msg_q->msg_list);
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pthread_mutex_destroy(&tmp_msg_q->list_mutex);
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free(tmp_msg_q);
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return eMSG_Q_FAILURE_GENERAL;
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}
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tmp_msg_q->unblocked = 0;
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*msg_q_data = tmp_msg_q;
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return eMSG_Q_SUCCESS;
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}
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/*===========================================================================
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FUNCTION: msg_q_init2
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===========================================================================*/
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const void* msg_q_init2()
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{
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void* q = NULL;
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if (eMSG_Q_SUCCESS != msg_q_init(&q)) {
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q = NULL;
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}
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return q;
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}
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/*===========================================================================
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FUNCTION: msg_q_destroy
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===========================================================================*/
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msq_q_err_type msg_q_destroy(void** msg_q_data)
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{
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if( msg_q_data == NULL )
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{
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LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
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return eMSG_Q_INVALID_HANDLE;
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}
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msg_q* p_msg_q = (msg_q*)*msg_q_data;
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linked_list_destroy(&p_msg_q->msg_list);
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pthread_mutex_destroy(&p_msg_q->list_mutex);
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pthread_cond_destroy(&p_msg_q->list_cond);
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p_msg_q->unblocked = 0;
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free(*msg_q_data);
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*msg_q_data = NULL;
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return eMSG_Q_SUCCESS;
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}
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/*===========================================================================
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FUNCTION: msg_q_snd
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===========================================================================*/
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msq_q_err_type msg_q_snd(void* msg_q_data, void* msg_obj, void (*dealloc)(void*))
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{
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msq_q_err_type rv;
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if( msg_q_data == NULL )
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{
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LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
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return eMSG_Q_INVALID_HANDLE;
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}
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if( msg_obj == NULL )
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{
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LOC_LOGE("%s: Invalid msg_obj parameter!\n", __FUNCTION__);
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return eMSG_Q_INVALID_PARAMETER;
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}
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msg_q* p_msg_q = (msg_q*)msg_q_data;
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pthread_mutex_lock(&p_msg_q->list_mutex);
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LOC_LOGV("%s: Sending message with handle = 0x%08X\n", __FUNCTION__, msg_obj);
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if( p_msg_q->unblocked )
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{
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LOC_LOGE("%s: Message queue has been unblocked.\n", __FUNCTION__);
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pthread_mutex_unlock(&p_msg_q->list_mutex);
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return eMSG_Q_UNAVAILABLE_RESOURCE;
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}
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rv = convert_linked_list_err_type(linked_list_add(p_msg_q->msg_list, msg_obj, dealloc));
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/* Show data is in the message queue. */
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pthread_cond_signal(&p_msg_q->list_cond);
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pthread_mutex_unlock(&p_msg_q->list_mutex);
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LOC_LOGV("%s: Finished Sending message with handle = 0x%08X\n", __FUNCTION__, msg_obj);
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return rv;
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}
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/*===========================================================================
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FUNCTION: msg_q_rcv
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===========================================================================*/
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msq_q_err_type msg_q_rcv(void* msg_q_data, void** msg_obj)
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{
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msq_q_err_type rv;
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if( msg_q_data == NULL )
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{
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LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
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return eMSG_Q_INVALID_HANDLE;
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}
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if( msg_obj == NULL )
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{
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LOC_LOGE("%s: Invalid msg_obj parameter!\n", __FUNCTION__);
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return eMSG_Q_INVALID_PARAMETER;
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}
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msg_q* p_msg_q = (msg_q*)msg_q_data;
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LOC_LOGV("%s: Waiting on message\n", __FUNCTION__);
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pthread_mutex_lock(&p_msg_q->list_mutex);
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if( p_msg_q->unblocked )
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{
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LOC_LOGE("%s: Message queue has been unblocked.\n", __FUNCTION__);
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pthread_mutex_unlock(&p_msg_q->list_mutex);
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return eMSG_Q_UNAVAILABLE_RESOURCE;
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}
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/* Wait for data in the message queue */
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while( linked_list_empty(p_msg_q->msg_list) && !p_msg_q->unblocked )
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{
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pthread_cond_wait(&p_msg_q->list_cond, &p_msg_q->list_mutex);
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}
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rv = convert_linked_list_err_type(linked_list_remove(p_msg_q->msg_list, msg_obj));
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pthread_mutex_unlock(&p_msg_q->list_mutex);
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LOC_LOGV("%s: Received message 0x%08X rv = %d\n", __FUNCTION__, *msg_obj, rv);
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return rv;
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}
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/*===========================================================================
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FUNCTION: msg_q_flush
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===========================================================================*/
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msq_q_err_type msg_q_flush(void* msg_q_data)
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{
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msq_q_err_type rv;
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if ( msg_q_data == NULL )
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{
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LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
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return eMSG_Q_INVALID_HANDLE;
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}
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msg_q* p_msg_q = (msg_q*)msg_q_data;
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LOC_LOGD("%s: Flushing Message Queue\n", __FUNCTION__);
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pthread_mutex_lock(&p_msg_q->list_mutex);
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/* Remove all elements from the list */
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rv = convert_linked_list_err_type(linked_list_flush(p_msg_q->msg_list));
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pthread_mutex_unlock(&p_msg_q->list_mutex);
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LOC_LOGD("%s: Message Queue flushed\n", __FUNCTION__);
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return rv;
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}
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/*===========================================================================
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FUNCTION: msg_q_unblock
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===========================================================================*/
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msq_q_err_type msg_q_unblock(void* msg_q_data)
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{
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if ( msg_q_data == NULL )
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{
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LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
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return eMSG_Q_INVALID_HANDLE;
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}
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msg_q* p_msg_q = (msg_q*)msg_q_data;
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pthread_mutex_lock(&p_msg_q->list_mutex);
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if( p_msg_q->unblocked )
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{
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LOC_LOGE("%s: Message queue has been unblocked.\n", __FUNCTION__);
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pthread_mutex_unlock(&p_msg_q->list_mutex);
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return eMSG_Q_UNAVAILABLE_RESOURCE;
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}
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LOC_LOGD("%s: Unblocking Message Queue\n", __FUNCTION__);
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/* Unblocking message queue */
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p_msg_q->unblocked = 1;
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/* Allow all the waiters to wake up */
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pthread_cond_broadcast(&p_msg_q->list_cond);
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pthread_mutex_unlock(&p_msg_q->list_mutex);
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LOC_LOGD("%s: Message Queue unblocked\n", __FUNCTION__);
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return eMSG_Q_SUCCESS;
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}
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