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annotate TaskManager/kernel/ppe/MailManager.cc @ 662:6dd6145eb1a5 draft

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merge
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 02 Dec 2009 20:44:01 +0900
parents 470db907a460 aefb5ee6fcd0
children cc1b7333de92
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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>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 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::extend()
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30 {
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31 memaddr *newq = New(memaddr,size*2);
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32 unsigned int i = 0;
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33 while(i<size) {
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34 newq[i++] = queue[read++];
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35 read &= mask;
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36 }
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37 read = 0; write = i;
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38 calc_mask(size*2);
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39 free(queue);
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40 queue = newq;
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41 }
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43 void
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44 MailManager::send(memaddr data)
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45 {
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46 queue[write++] = data;
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47 write &= mask;
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48 if (write==read) {
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49 extend();
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50 }
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51 }
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53 memaddr
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54 MailManager::recv()
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55 {
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56 memaddr data;
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57 if (count()>0) {
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58 data = queue[read++];
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59 read &= mask;
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60 } else {
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61 data = 0;
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62 }
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63 return data;
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64 }
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66 /* end */