Multiprocessors including means for communicating with each other through shared memory
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United States of America Patent
Stats
-
May 25, 1993
Grant Date -
N/A
app pub date -
May 22, 1990
filing date -
May 26, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a memory device shared among processors, a communication buffer having a size requested by the processing program of the origin of sending is dynamically secured. After the communication buffer has been secured, the send program writes a message to be conveyed to the receive program into the above described communication buffer and asks the send OS to perform sending. The send OS sends a communication ID having '1' set in the bit position corresponding to the receive program. On the basis of the above described bit position, the receive OS specifies a receive program and informs the receive program of that fact. The receive program reads a message from the communication buffer. Communication between the send program and the receive program is thus realized. A send instruction and a receive instruction respectively for exclusive use of sending and reading out a communication ID are prepared beforehand.
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