Miscellaneous Library, read Encoder etc.
Signal.cpp@0:3312872854c4, 2019-03-04 (annotated)
- Committer:
- altb
- Date:
- Mon Mar 04 11:03:51 2019 +0000
- Revision:
- 0:3312872854c4
New Lib Folder
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| altb | 0:3312872854c4 | 1 | /* |
| altb | 0:3312872854c4 | 2 | * Signal.cpp |
| altb | 0:3312872854c4 | 3 | * Copyright (c) 2017, ZHAW |
| altb | 0:3312872854c4 | 4 | * All rights reserved. |
| altb | 0:3312872854c4 | 5 | */ |
| altb | 0:3312872854c4 | 6 | |
| altb | 0:3312872854c4 | 7 | #include "Signal.h" |
| altb | 0:3312872854c4 | 8 | |
| altb | 0:3312872854c4 | 9 | using namespace std; |
| altb | 0:3312872854c4 | 10 | |
| altb | 0:3312872854c4 | 11 | int32_t Signal::signals = 0; |
| altb | 0:3312872854c4 | 12 | |
| altb | 0:3312872854c4 | 13 | /** |
| altb | 0:3312872854c4 | 14 | * Creates a signal object and assignes a unique flag. |
| altb | 0:3312872854c4 | 15 | */ |
| altb | 0:3312872854c4 | 16 | Signal::Signal() { |
| altb | 0:3312872854c4 | 17 | |
| altb | 0:3312872854c4 | 18 | mutex.lock(); |
| altb | 0:3312872854c4 | 19 | |
| altb | 0:3312872854c4 | 20 | int32_t n = 0; |
| altb | 0:3312872854c4 | 21 | while ((((1 << n) & signals) > 0) && (n < 30)) n++; |
| altb | 0:3312872854c4 | 22 | signal = (1 << n); |
| altb | 0:3312872854c4 | 23 | |
| altb | 0:3312872854c4 | 24 | mutex.unlock(); |
| altb | 0:3312872854c4 | 25 | } |
| altb | 0:3312872854c4 | 26 | |
| altb | 0:3312872854c4 | 27 | /** |
| altb | 0:3312872854c4 | 28 | * Deletes the signal object and releases the assigned flag. |
| altb | 0:3312872854c4 | 29 | */ |
| altb | 0:3312872854c4 | 30 | Signal::~Signal() { |
| altb | 0:3312872854c4 | 31 | |
| altb | 0:3312872854c4 | 32 | mutex.lock(); |
| altb | 0:3312872854c4 | 33 | |
| altb | 0:3312872854c4 | 34 | signals &= ~signal; |
| altb | 0:3312872854c4 | 35 | |
| altb | 0:3312872854c4 | 36 | mutex.unlock(); |
| altb | 0:3312872854c4 | 37 | } |
| altb | 0:3312872854c4 | 38 | |
| altb | 0:3312872854c4 | 39 | /** |
| altb | 0:3312872854c4 | 40 | * Gets the assigned signal flag. |
| altb | 0:3312872854c4 | 41 | */ |
| altb | 0:3312872854c4 | 42 | int32_t Signal::read() { |
| altb | 0:3312872854c4 | 43 | |
| altb | 0:3312872854c4 | 44 | return signal; |
| altb | 0:3312872854c4 | 45 | } |
| altb | 0:3312872854c4 | 46 | |
| altb | 0:3312872854c4 | 47 | /** |
| altb | 0:3312872854c4 | 48 | * The empty operator is a shorthand notation of the <code>read()</code> method. |
| altb | 0:3312872854c4 | 49 | */ |
| altb | 0:3312872854c4 | 50 | Signal::operator int32_t() { |
| altb | 0:3312872854c4 | 51 | |
| altb | 0:3312872854c4 | 52 | return read(); |
| altb | 0:3312872854c4 | 53 | } |
| altb | 0:3312872854c4 | 54 |