System and method for serialization control of accesses to a com

Details System and method for serialization control of accesses to a com System and method for serialization control of accesses to a com

1989-10-12

1994-03-22

Gossage, Glenn

Boots, shoes, and leggings

364DIG7, 395550, G06F 1300, G06F 1316

Patent

active

052972674

ABSTRACT:
A system and method for controlling a "serialization" of accesses to main storage in a tightly coupled multi-processing apparatus is disclosed. The system includes a plurality of central processing units (CPUs), a main storage unit commonly shared by the plurality of CPUs and a memory control unit operatively connected to each of the CPUs. A process for ensuring that a correct sequence of accesses to the main storage is followed is called a "serialization." When a serialization occurs subsequent to a "STORE" instruction in a particular CPU, the system for controlling a serialization notifies the occurrence of a serialization to all other CPUs before the particular CPU requests the memory control unit for the serialization. If the particular CPU is not notified of any occurrence of a serialization in the other CPUs, the particular CPU immediately executes the following "FETCH" operation without waiting for completion of the particular CPU's serialization. Even if notified of an occurrence of a serialization in the other CPUs, the particular CPU need only wait for completion of the other CPU's serialization to execute the following "FETCH". When a serialization does not occur in the particular CPU, serialization notifications by the other CPUs are disregarded.

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