发明名称 |
Shared memory interface with conventional access and synchronization support |
摘要 |
Disclosed is an apparatus and method for providing synchronization support in a multiprocessor environment using a memory interface that supports an atomic read-modify-write operation as well as conventional read and write access to memory. Selection of the operation is made dependent on which ever address of a plurality of addresses is used to reference a single physical memory location in which there is stored a lock variable used to restrict access to a shared resource. When the particular access corresponds to a read-modify-write operation, the lock variable is read out and a modified version written back into memory on the condition that the shared resource is available to the requesting processor. The method and apparatus executes read-modify-write operations by interface logic circuitry in response to a single processor read operation. Through these atomic or otherwise indivisible operations, the method and apparatus precludes multiprocessor conflict.
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申请公布号 |
US6795901(B1) |
申请公布日期 |
2004.09.21 |
申请号 |
US19990466303 |
申请日期 |
1999.12.17 |
申请人 |
ALLIANT TECHSYSTEMS INC. |
发明人 |
FLOREK RANDALL A.;LACOUR CLAIRE J. |
分类号 |
G06F9/46;G06F12/14;(IPC1-7):G06F12/14 |
主分类号 |
G06F9/46 |
代理机构 |
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地址 |
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