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annotate anagram/guisupport/resource.h @ 18:562c313f14f4

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some minor updates for 2022
author David A. Holland
date Tue, 31 May 2022 02:03:50 -0400
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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 */