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annotate TaskManager/kernel/ppe/MailManager.cc @ 1189:898fdcf53c31 draft

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add SemMailManager
author Daichi TOMA
date Fri, 08 Jul 2011 18:34:18 +0900
parents d4311f83377a
children 5238ca826d6e
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1 #include <stdlib.h>
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2 #include "MailManager.h"
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3
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4 void
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5 MailManager::calc_mask(unsigned int qsize)
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6 {
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7 mask = 1;
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8 while(qsize>mask) {
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9 mask <<= 1;
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10 }
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11 size = mask;
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12 mask--;
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13 }
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15 MailManager::MailManager(unsigned int qsize) {
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16 read = write = 0;
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17 calc_mask(qsize);
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18 queue = Newq(memaddr,size);
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19 }
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21 MailManager::~MailManager() { free(queue); }
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22
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23 int
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24 MailManager::count()
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25 {
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26 return (write+size-read)&mask;
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27 }
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29 void
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30 MailManager::extend()
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31 {
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32 memaddr *newq = Newq(memaddr,size*2);
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33 unsigned int i = 0;
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34 while(i<size) {
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35 newq[i++] = queue[read++];
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36 read &= mask;
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37 }
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38 read = 0; write = i;
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39 calc_mask(size*2);
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40 free(queue);
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41 queue = newq;
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42 }
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44 void
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45 MailManager::send(memaddr data)
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46 {
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47 queue[write++] = data;
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48 write &= mask;
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49 if (write==read) {
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50 extend();
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51 }
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52 }
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53
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54 memaddr
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55 MailManager::recv()
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56 {
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57 memaddr data;
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58 if (count()>0) {
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59 data = queue[read++];
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60 read &= mask;
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61 } else {
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62 data = 0;
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63 }
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64 return data;
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65 }
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67 /* end */