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annotate anagram/guisupport/resource.h @ 21:1c9dac05d040

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Add lint-style FALLTHROUGH annotations to fallthrough cases. (in the parse engine and thus the output code) Document this, because the old output causes warnings with gcc10.
author David A. Holland
date Mon, 13 Jun 2022 00:04:38 -0400
parents 13d2b8934445
children
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1 /*
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2 * AnaGram, A System for Syntax Directed Programming
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3 * Copyright 1993-2002 Parsifal Software. All Rights Reserved.
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4 * See the file COPYING for license and usage terms.
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5 *
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6 * resource.h
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7 */
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8
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9 #ifndef RESOURCE_H
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10 #define RESOURCE_H
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11
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12 #ifdef __IBMCPP__
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13 #include <ireslock.hpp>
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14 #endif
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15
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16
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17 #ifdef __IBMCPP__
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18
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19 class AgResource {
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20 private:
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21 class Resource : public IPrivateResource {
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22 public:
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23 void *operator new (size_t, void *s) { return s; }
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24 };
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25
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26 void *storage;
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27 IPrivateResource *resource;
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28
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29 public:
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30 AgResource() : storage(0), resource(0) {}
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31 ~AgResource() { if (storage == 0) delete resource; }
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32 void lock() {
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33 if (resource == 0) {
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34 resource = new IPrivateResource;
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35 }
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36 resource->lock();
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37 }
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38 void lock(void *s) {
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39 if (resource == 0) {
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40 resource = new(storage = s) Resource;
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41 }
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42 resource->lock();
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43 }
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44 void unlock() {
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45 resource->unlock();
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46 }
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47 };
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48
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49 #endif /* __IBMCPP__ */
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50
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51
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52 class AgLock {
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53 private:
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54 AgResource &resource;
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55
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56 public:
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57 AgLock(AgResource &r) : resource(r) {
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58 resource.lock();
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59 }
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60 AgLock(AgResource &r, void *s) : resource(r) {
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61 resource.lock(s);
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62 }
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63 ~AgLock() {resource.unlock();}
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64 };
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65
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66
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67 #endif /* RESOURCE_H */