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/* Copyright (c) 2011, 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 <stdio.h>
#include "log_util.h"
#include "platform_lib_includes.h"
#include "loc_eng_dmn_conn_thread_helper.h"
/*===========================================================================
FUNCTION thelper_signal_init
DESCRIPTION
This function will initialize the conditional variable resources.
thelper - thelper instance
DEPENDENCIES
None
RETURN VALUE
0: success or negative value for failure
SIDE EFFECTS
N/A
===========================================================================*/
int thelper_signal_init(struct loc_eng_dmn_conn_thelper * thelper)
{
int result;
thelper->thread_exit = 0;
thelper->thread_ready = 0;
result = pthread_cond_init( &thelper->thread_cond, NULL);
if (result) {
return result;
}
result = pthread_mutex_init(&thelper->thread_mutex, NULL);
if (result) {
pthread_cond_destroy(&thelper->thread_cond);
}
return result;
}
/*===========================================================================
FUNCTION
DESCRIPTION
This function will destroy the conditional variable resources
thelper - pointer to thelper instance
DEPENDENCIES
None
RETURN VALUE
0: success or negative value for failure
SIDE EFFECTS
N/A
===========================================================================*/
int thelper_signal_destroy(struct loc_eng_dmn_conn_thelper * thelper)
{
int result, ret_result = 0;
result = pthread_cond_destroy( &thelper->thread_cond);
if (result) {
ret_result = result;
}
result = pthread_mutex_destroy(&thelper->thread_mutex);
if (result) {
ret_result = result;
}
return ret_result;
}
/*===========================================================================
FUNCTION thelper_signal_wait
DESCRIPTION
This function will be blocked on the conditional variable until thelper_signal_ready
is called
thelper - pointer to thelper instance
DEPENDENCIES
None
RETURN VALUE
0: success or negative value for failure
SIDE EFFECTS
N/A
===========================================================================*/
int thelper_signal_wait(struct loc_eng_dmn_conn_thelper * thelper)
{
int result = 0;
pthread_mutex_lock(&thelper->thread_mutex);
if (!thelper->thread_ready && !thelper->thread_exit) {
result = pthread_cond_wait(&thelper->thread_cond, &thelper->thread_mutex);
}
if (thelper->thread_exit) {
result = -1;
}
pthread_mutex_unlock(&thelper->thread_mutex);
return result;
}
/*===========================================================================
FUNCTION thelper_signal_ready
DESCRIPTION
This function will wake up the conditional variable
thelper - pointer to thelper instance
DEPENDENCIES
None
RETURN VALUE
0: success or negative value for failure
SIDE EFFECTS
N/A
===========================================================================*/
int thelper_signal_ready(struct loc_eng_dmn_conn_thelper * thelper)
{
int result;
LOC_LOGD("%s:%d] 0x%lx\n", __func__, __LINE__, (long) thelper);
pthread_mutex_lock(&thelper->thread_mutex);
thelper->thread_ready = 1;
result = pthread_cond_signal(&thelper->thread_cond);
pthread_mutex_unlock(&thelper->thread_mutex);
return result;
}
/*===========================================================================
FUNCTION thelper_signal_block
DESCRIPTION
This function will set the thread ready to 0 to block the thelper_signal_wait
thelper - pointer to thelper instance
DEPENDENCIES
None
RETURN VALUE
if thread_ready is set
SIDE EFFECTS
N/A
===========================================================================*/
int thelper_signal_block(struct loc_eng_dmn_conn_thelper * thelper)
{
int result = thelper->thread_ready;
LOC_LOGD("%s:%d] 0x%lx\n", __func__, __LINE__, (long) thelper);
pthread_mutex_lock(&thelper->thread_mutex);
thelper->thread_ready = 0;
pthread_mutex_unlock(&thelper->thread_mutex);
return result;
}
/*===========================================================================
FUNCTION thelper_main
DESCRIPTION
This function is the main thread. It will be launched as a child thread
data - pointer to the instance
DEPENDENCIES
None
RETURN VALUE
NULL
SIDE EFFECTS
N/A
===========================================================================*/
static void * thelper_main(void *data)
{
int result = 0;
struct loc_eng_dmn_conn_thelper * thelper = (struct loc_eng_dmn_conn_thelper *) data;
if (thelper->thread_proc_init) {
result = thelper->thread_proc_init(thelper->thread_context);
if (result < 0) {
thelper->thread_exit = 1;
thelper_signal_ready(thelper);
LOC_LOGE("%s:%d] error: 0x%lx\n", __func__, __LINE__, (long) thelper);
return NULL;
}
}
thelper_signal_ready(thelper);
if (thelper->thread_proc_pre) {
result = thelper->thread_proc_pre(thelper->thread_context);
if (result < 0) {
thelper->thread_exit = 1;
LOC_LOGE("%s:%d] error: 0x%lx\n", __func__, __LINE__, (long) thelper);
return NULL;
}
}
do {
if (thelper->thread_proc) {
result = thelper->thread_proc(thelper->thread_context);
if (result < 0) {
thelper->thread_exit = 1;
LOC_LOGE("%s:%d] error: 0x%lx\n", __func__, __LINE__, (long) thelper);
}
}
} while (thelper->thread_exit == 0);
if (thelper->thread_proc_post) {
result = thelper->thread_proc_post(thelper->thread_context);
}
if (result != 0) {
LOC_LOGE("%s:%d] error: 0x%lx\n", __func__, __LINE__, (long) thelper);
}
return NULL;
}
static void thelper_main_2(void *data)
{
thelper_main(data);
return;
}
/*===========================================================================
FUNCTION loc_eng_dmn_conn_launch_thelper
DESCRIPTION
This function will initialize the thread context and launch the thelper_main
thelper - pointer to thelper instance
thread_proc_init - The initialization function pointer
thread_proc_pre - The function to call before task loop and after initialization
thread_proc - The task loop
thread_proc_post - The function to call after the task loop
context - the context for the above four functions
DEPENDENCIES
None
RETURN VALUE
0: success or negative value for failure
SIDE EFFECTS
N/A
===========================================================================*/
int loc_eng_dmn_conn_launch_thelper(struct loc_eng_dmn_conn_thelper * thelper,
int (*thread_proc_init) (void * context),
int (*thread_proc_pre) (void * context),
int (*thread_proc) (void * context),
int (*thread_proc_post) (void * context),
thelper_create_thread create_thread_cb,
void * context)
{
int result;
thelper_signal_init(thelper);
if (context) {
thelper->thread_context = context;
}
thelper->thread_proc_init = thread_proc_init;
thelper->thread_proc_pre = thread_proc_pre;
thelper->thread_proc = thread_proc;
thelper->thread_proc_post = thread_proc_post;
LOC_LOGD("%s:%d] 0x%lx call pthread_create\n", __func__, __LINE__, (long) thelper);
if (create_thread_cb) {
result = 0;
thelper->thread_id = create_thread_cb("loc_eng_dmn_conn",
thelper_main_2, (void *)thelper);
} else {
result = pthread_create(&thelper->thread_id, NULL,
thelper_main, (void *)thelper);
}
if (result != 0) {
LOC_LOGE("%s:%d] 0x%lx\n", __func__, __LINE__, (long) thelper);
return -1;
}
LOC_LOGD("%s:%d] 0x%lx pthread_create done\n", __func__, __LINE__, (long) thelper);
thelper_signal_wait(thelper);
LOC_LOGD("%s:%d] 0x%lx pthread ready\n", __func__, __LINE__, (long) thelper);
return thelper->thread_exit;
}
/*===========================================================================
FUNCTION loc_eng_dmn_conn_unblock_thelper
DESCRIPTION
This function unblocks thelper_main to release the thread
thelper - pointer to thelper instance
DEPENDENCIES
None
RETURN VALUE
0: success
SIDE EFFECTS
N/A
===========================================================================*/
int loc_eng_dmn_conn_unblock_thelper(struct loc_eng_dmn_conn_thelper * thelper)
{
LOC_LOGD("%s:%d] 0x%lx\n", __func__, __LINE__, (long) thelper);
thelper->thread_exit = 1;
return 0;
}
/*===========================================================================
FUNCTION loc_eng_dmn_conn_join_thelper
thelper - pointer to thelper instance
DESCRIPTION
This function will wait for the thread of thelper_main to finish
DEPENDENCIES
None
RETURN VALUE
0: success or negative value for failure
SIDE EFFECTS
N/A
===========================================================================*/
int loc_eng_dmn_conn_join_thelper(struct loc_eng_dmn_conn_thelper * thelper)
{
int result;
LOC_LOGD("%s:%d] 0x%lx\n", __func__, __LINE__, (long) thelper);
result = pthread_join(thelper->thread_id, NULL);
if (result != 0) {
LOC_LOGE("%s:%d] 0x%lx\n", __func__, __LINE__, (long) thelper);
}
LOC_LOGD("%s:%d] 0x%lx\n", __func__, __LINE__, (long) thelper);
thelper_signal_destroy(thelper);
return result;
}
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