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Printer manager task void prntask void int

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/*** printer manager task ***/ void prntask (void) { int PrinterStack[P], PrnUse[P]; /* stack of available printers, and table of tasks using printers */ int PSptr; /* pointer to PrinterStack table */ int i,pid,tid; char msgbuf[MAX_MSG_LEN]; /* Initialize tables and pointers */ for(i=0,i<P, i++) PrinterStack[i] = i; PSptr = P-1; while(TRUE) { /* Wait for a request */ msgQReceive(mqPrnRequest,msgbuf,MAX_MSG_LEN,WAIT_FOREVER); sscanf(msgbuf, "%d %d %d", &code, &tid, &pid); if(code == 1) { /* request printer */ pid = PrinterStack[PSptr]; /* take one printer from the stack */ PSptr--; PrnUse[pid] = tid; /* maintain list of used printers */ sprintf(msgbuf,"%d",pid); /* prepare message */ } else { /* release printer */ PSptr++; PrinterStack[PSptr] = pid; /* return printer to the stack */ PrnUse[pid] = 0; /* maintain list of used printers */ sprintf(msgbuf,"0"); /* prepare acknowledgment */ } /* send printer ID or acknowledgement to requesting task */ msgQSend(mqPrnRequest,msgbuf,MAX_MSG_LEN,WAIT_FOREVER); } }
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