260 lines
14 KiB
C
260 lines
14 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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/*****************************************************************************/
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/* */
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/* File Name : osal_cond_var.c */
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/* */
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/* Description : This file contains all the necessary function */
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/* definitions required to operate on Conditional */
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/* Variable. */
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/* */
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/* List of Functions : osal_cond_var_create */
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/* osal_cond_var_destroy */
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/* osal_cond_var_wait */
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/* osal_cond_var_wait_timed */
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/* osal_cond_var_signal */
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/* */
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/* Issues / Problems : None */
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/* */
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/* Revision History : */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 05 09 2006 Ittiam Draft */
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/* */
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/*****************************************************************************/
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/*****************************************************************************/
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/* File Includes */
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/*****************************************************************************/
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/* System include files */
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#include <stdio.h>
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#include <errno.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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/* User include files */
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#include "cast_types.h"
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#include "osal.h"
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#include "osal_handle.h"
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#include "osal_mutex.h"
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#include "osal_cond_var.h"
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/*****************************************************************************/
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/* */
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/* Function Name : osal_cond_var_create */
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/* */
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/* Description : This function initializes the conditional variable and */
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/* returns the handle to it. */
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/* */
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/* Inputs : OSAL handle */
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/* Memory manager handle */
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/* */
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/* Globals : None */
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/* */
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/* Processing : Calls system specific API and returns handle to the */
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/* conditional variable. */
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/* */
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/* Outputs : Handle to Condtional Variable */
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/* */
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/* Returns : On SUCCESS - Handle to Conditional Varaible */
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/* On FAILURE - NULL */
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/* */
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/* Issues : None */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 05 09 2006 Ittiam Draft */
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/* */
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/*****************************************************************************/
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void *osal_cond_var_create(IN void *osal_handle)
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{
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if(0 == osal_handle)
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return 0;
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{
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osal_t *handle = osal_handle;
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cond_var_handle_t *cond_var_handle = 0;
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void *mmr_handle = 0;
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if(0 == handle || 0 == handle->alloc || 0 == handle->free)
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return 0;
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/* Initialize MMR handle */
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mmr_handle = handle->mmr_handle;
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/* Allocate memory for the Handle */
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cond_var_handle = handle->alloc(mmr_handle, sizeof(cond_var_handle_t));
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/* Error in memory allocation */
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if(0 == cond_var_handle)
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return 0;
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cond_var_handle->mmr_handle = mmr_handle;
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cond_var_handle->hdl = handle;
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/* Create semaphore */
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if(0 != pthread_cond_init(&(cond_var_handle->cond_var), 0))
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{
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handle->free(mmr_handle, cond_var_handle);
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return 0;
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}
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return cond_var_handle;
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}
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}
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/*****************************************************************************/
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/* */
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/* Function Name : osal_cond_var_destroy */
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/* */
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/* Description : This function destroys all the OS resources allocated by */
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/* 'osal_cond_var_create' API. */
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/* */
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/* Inputs : Conditional Variable handle */
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/* */
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/* Globals : None */
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/* */
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/* Processing : Validates the input and destroys all the OS allocated */
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/* resources. */
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/* */
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/* Outputs : Status of closure */
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/* */
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/* Returns : On SUCCESS - OSAL_SUCCESS */
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/* On FAILURE - OSAL_ERROR */
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/* */
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/* Issues : None */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 10 05 2006 Ittiam Draft */
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/* */
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/*****************************************************************************/
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WORD32 osal_cond_var_destroy(IN void *cond_var_handle)
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{
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if(0 == cond_var_handle)
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return OSAL_ERROR;
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{
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cond_var_handle_t *handle = (cond_var_handle_t *)cond_var_handle;
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WORD32 status = 0;
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if(0 == handle->hdl || 0 == handle->hdl->free)
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return OSAL_ERROR;
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/* Destroy the mutex */
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status = pthread_cond_destroy(&(handle->cond_var));
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if(0 != status)
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return OSAL_ERROR;
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/* Free the handle */
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handle->hdl->free(handle->mmr_handle, handle);
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return OSAL_SUCCESS;
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}
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}
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/*****************************************************************************/
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/* */
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/* Function Name : osal_cond_var_wait */
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/* */
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/* Description : This function waits infinitely on conditional varaiable. */
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/* */
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/* Inputs : Conditional Variable handle */
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/* Mutex handle for lock */
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/* */
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/* Globals : None */
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/* */
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/* Processing : This function waits on Conditional variable signal. Till */
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/* signal is not, lock on mutex is relinquished. */
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/* */
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/* Outputs : Status of wait on conditional variable */
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/* */
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/* Returns : On SUCCESS - OSAL_SUCCESS */
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/* On FAILURE - OSAL_ERROR */
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/* */
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/* Issues : None */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 10 05 2006 Ittiam Draft */
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/* */
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/*****************************************************************************/
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WORD32 osal_cond_var_wait(IN void *cond_var_handle, IN void *mutex_handle)
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{
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if(0 == cond_var_handle || 0 == mutex_handle)
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return OSAL_ERROR;
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{
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mutex_handle_t *mutex = (mutex_handle_t *)mutex_handle;
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cond_var_handle_t *cond_var = (cond_var_handle_t *)cond_var_handle;
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return pthread_cond_wait(&(cond_var->cond_var), &(mutex->mutex_handle));
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}
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}
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/*****************************************************************************/
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/* */
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/* Function Name : osal_cond_var_signal */
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/* */
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/* Description : This function signals on a conditional variable. */
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/* */
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/* Inputs : Conditional Variable handle */
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/* */
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/* Globals : None */
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/* */
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/* Processing : Calls the underlaying API to signal on a conditional */
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/* variable. */
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/* */
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/* Outputs : Status of signalling */
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/* */
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/* Returns : On SUCCESS - OSAL_SUCCESS */
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/* On FAILURE - OSAL_ERROR */
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/* */
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/* Issues : None */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 10 05 2006 Ittiam Draft */
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/* */
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/*****************************************************************************/
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WORD32 osal_cond_var_signal(IN void *cond_var_handle)
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{
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if(0 == cond_var_handle)
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return OSAL_ERROR;
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{
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cond_var_handle_t *cond_var = (cond_var_handle_t *)cond_var_handle;
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return pthread_cond_signal(&(cond_var->cond_var));
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}
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}
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