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view TaskManager/kernel/ppe/MailManager.cc @ 0:04e28d8d3c6f
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author | Daiki KINJYO <e085722@ie.u-ryukyu.ac.jp> |
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date | Mon, 08 Nov 2010 01:23:25 +0900 |
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#include <stdlib.h> #include "MailManager.h" void MailManager::calc_mask(unsigned int qsize) { mask = 1; while(qsize>mask) { mask <<= 1; } size = mask; mask--; } MailManager::MailManager(unsigned int qsize) { read = write = 0; calc_mask(qsize); queue = Newq(memaddr,size); } MailManager::~MailManager() { free(queue); } int MailManager::count() { return (write+size-read)&mask; } void MailManager::extend() { memaddr *newq = Newq(memaddr,size*2); unsigned int i = 0; while(i<size) { newq[i++] = queue[read++]; read &= mask; } read = 0; write = i; calc_mask(size*2); free(queue); queue = newq; } void MailManager::send(memaddr data) { queue[write++] = data; write &= mask; if (write==read) { extend(); } } memaddr MailManager::recv() { memaddr data; if (count()>0) { data = queue[read++]; read &= mask; } else { data = 0; } return data; } /* end */