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annotate TaskManager/kernel/ppe/MailManager.cc @ 647:7c9ded1ea750

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MailManager rewrite. not yet worked.
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Sat, 21 Nov 2009 16:18:47 +0900
parents 5e1a477fcaec
children 55f898a58748
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1 #include <stdlib.h>
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2 #include "MailManager.h"
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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>>= 1)>0) {
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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 calc_mask(qsize);
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17 queue = New(memaddr,size);
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18 }
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20 MailManager::~MailManager() { free(queue); }
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21
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22 int
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23 MailManager::count()
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24 {
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25 return (write+size-read)&mask;
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26 }
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28 void
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29 MailManager::send(memaddr data)
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30 {
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31 queue[write++] = data;
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32 if (write==read) {
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33
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34 calc_mask(size*2);
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36 memaddr *newq = New(memaddr,size);
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37 int i;
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38 while(count()>0) {
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39 newq[i++] = recv();
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40 }
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41 read = 0; write = i;
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42 free(queue);
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43 queue = newq;
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44 }
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45 write &= mask;
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46 }
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48 memaddr
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49 MailManager::recv()
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50 {
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51 memaddr data;
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52 if (count()>0) {
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53 data = queue[read++];
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54 read &= mask;
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55 } else {
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56 data = 0;
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57 }
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58 return data;
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59 }
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61 /* end */