Signal.cpp

00001 /*
00002  * Signal.cpp
00003  * Copyright (c) 2017, ZHAW
00004  * All rights reserved.
00005  */
00006 
00007 #include "Signal.h"
00008 
00009 using namespace std;
00010 
00011 int32_t Signal::signals = 0;
00012 
00013 /**
00014  * Creates a signal object and assignes a unique flag.
00015  */
00016 Signal::Signal() {
00017     
00018     mutex.lock();
00019     
00020     int32_t n = 0;
00021     while ((((1 << n) & signals) > 0) && (n < 30)) n++;
00022     signal = (1 << n);
00023     
00024     mutex.unlock();
00025 }
00026 
00027 /**
00028  * Deletes the signal object and releases the assigned flag.
00029  */
00030 Signal::~Signal() {
00031     
00032     mutex.lock();
00033     
00034     signals &= ~signal;
00035     
00036     mutex.unlock();
00037 }
00038 
00039 /**
00040  * Gets the assigned signal flag.
00041  */
00042 int32_t Signal::read() {
00043     
00044     return signal;
00045 }
00046 
00047 /**
00048  * The empty operator is a shorthand notation of the <code>read()</code> method.
00049  */
00050 Signal::operator int32_t() {
00051     
00052     return read();
00053 }
00054