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By Richard A. Burgess
Initially titled constructing your personal 32 Bit working process this ebook indicates you the way one guy outfitted a whole, 32 bit working procedure for the Intel processors from scratch, working on processors from the 80386, all of the means as much as the Pentium III. that allows you to understand what it takes to construct an working process, otherwise you are looking to construct your individual, you will want this booklet! it truly is indespensible, It covers all the significant parts that make up a contemporary micro-kernel working process. It incorporates a CD-ROM containing all the seriously commented code. (Intel 32 bit Assembler and C) to teach you how one was once equipped (from proposal to debugger). (For Intermediate to complicated Programming point)
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Unsigned long WaitMsg(long dExch, char *pMsgRet); unsigned long CheckMsg(long dExch, char *pMsgRet); dExch is the exchange where we will wait to check for a message. pMsgRet points to an eight-byte (2 dwords) structure where the message will be placed. Did you notice (from my definitions above) that not only messages wait at exchanges, but tasks can wait there too? This is an extremely important concept. Consider the phone again. The task is the human, the answering machine is the exchange. You can leave a message on the machine (at the exchange) if no one (no task) is waiting there.
DnpSend - is the number (0, 1 or 2) of the two data pointers that are moving data from you to the service. The service already knows this, but network transport mechanisms do not. If pSend1 was a pointer to some data the service was getting from your memory area, and pSend2 was not used or was pointing to your memory area for the service to fill, dnpSend would be 1. If both data items were being sent to you from the service then this would be 0. *pData1 - Pointer to memory in your address space that the service must access (either to read or write as defined by the service code).
Where is the response data and status code? First, The content of the eight-byte message tells you if it is a message or a response. The convention is the value of the first dword in the message. If it is 80000000h or above, it is NOT a response. ). If this is the response, the second dword is the status code or error from the service. Zero (0) usually indicates no error, although its exact meaning is left up to the service. Second, if the request was serviced (with no errors), the data has already been placed into your memory space where pData1 or pData2 was pointing.