7abc5fe195
This will stop the iteration of the partition objects, kill the current twrpTar thread and remove the backup directory. Implement TWAtomicInt class to give us a wrapper that automatically uses mutexes before the read and write to help ensure that the reads and writes will be atomic based on documentation. Change-Id: I645b22bc980a292e9c7202acb24ffd22ebe68c63
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/*
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* Copyright (C) 2015 The Team Win Recovery 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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#include <pthread.h>
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#include <stdio.h>
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#include "tw_atomic.hpp"
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/*
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* According to this documentation:
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* https://developer.android.com/training/articles/smp.html
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* it is recommended to use mutexes instead of atomics. This class
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* provides us with a wrapper to make "atomic" variables easy to use.
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*/
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TWAtomicInt::TWAtomicInt(int initial_value /* = 0 */) {
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if (pthread_mutex_init(&mutex_lock, NULL) != 0) {
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// This should hopefully never happen. If it does, the
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// operations will not be atomic, but we will allow things to
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// continue anyway after logging the issue and just hope for
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// the best.
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printf("TWAtomic error initializing mutex.\n");
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use_mutex = false;
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} else {
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use_mutex = true;
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}
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value = initial_value;
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}
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TWAtomicInt::~TWAtomicInt() {
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if (use_mutex)
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pthread_mutex_destroy(&mutex_lock);
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}
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void TWAtomicInt::set_value(int new_value) {
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if (use_mutex) {
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pthread_mutex_lock(&mutex_lock);
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value = new_value;
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pthread_mutex_unlock(&mutex_lock);
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} else {
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value = new_value;
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}
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}
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int TWAtomicInt::get_value(void) {
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int ret_val;
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if (use_mutex) {
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pthread_mutex_lock(&mutex_lock);
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ret_val = value;
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pthread_mutex_unlock(&mutex_lock);
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} else {
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ret_val = value;
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}
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return ret_val;
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}
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