公开(公告)号：BR8800246A

公开(公告)日：1988-08-30

申请号：BR8800246

申请日：1988-01-25

Applicant: IBM

Inventor： CHANG ALBERT ,  NEUMAN GROVER HERBERT ,  SHAHEEN-GOUDA AMAL A ,  SMITH TODD ALLEN

IPC: G06F12/00 ,  G06F12/08 ,  G06F13/14

Abstract: In a distributed environment several data processing systems are interconnected across a network system (3). A distributed services program installed on the systems in the network allows the processors to access data files (5) distributed across the various nodes (A,B) of the network without regard to the location of the data file in the network. The processing system accessing the file, referred to as the client processing system, utilizes a client cache (12B) within its operating system (11B) to store the data file. Utilizing the client cache minimizes the number of reads and writes that must go over the network (3) to the server processing system where the file physically resides. The system and method of this invention prevents a process in the client processing system from accessing data in the client cache that has been modified at another node (A) in the network. The blocks of data in the client cache (12B) are tested for validity in the client processing system by using modification times as measured by the server processing system. If the cache data blocks are determined to be valid, the data is accessed from the client cache. If the cache data blocks are determined to be invalid, the data blocks are discarded, and the file is accessed from the server processing system.

公开(公告)号：DE3889739T2

公开(公告)日：1994-12-01

申请号：DE3889739

申请日：1988-01-26

Applicant: IBM

Inventor： CHANG ALBERT ,  SHAHEEN-GOUDA AMAL AHMED ,  NEUMAN GROVER HERBERT ,  SMITH TODD ALLEN

IPC: G06F12/00 ,  G06F12/08

Abstract: In a distributed environment several data processing systems are interconnected across a network system (3). A distributed services program installed on the systems in the network allows the processors to access data files (5) distributed across the various nodes (A,B) of the network without regard to the location of the data file in the network. The processing system accessing the file, referred to as the client processing system, utilizes a client cache (12B) within its operating system (11B) to store the data file. Utilizing the client cache minimizes the number of reads and writes that must go over the network (3) to the server processing system where the file physically resides. The system and method of this invention prevents a process in the client processing system from accessing data in the client cache that has been modified at another node (A) in the network. The blocks of data in the client cache (12B) are tested for validity in the client processing system by using modification times as measured by the server processing system. If the cache data blocks are determined to be valid, the data is accessed from the client cache. If the cache data blocks are determined to be invalid, the data blocks are discarded, and the file is accessed from the server processing system.

公开(公告)号：DE3481836D1

公开(公告)日：1990-05-10

申请号：DE3481836

申请日：1984-03-30

Applicant: IBM

Inventor： BARNES JOHNNY GENNIE ,  GAUDET JAMES LOUIS ,  HURLEY PATRICK JAMES ,  NEUMAN GROVER HERBERT

IPC: B41J19/32 ,  B41J7/00 ,  B41J25/24 ,  G06F17/24 ,  G06F15/20

公开(公告)号：DE3889739D1

公开(公告)日：1994-07-07

申请号：DE3889739

申请日：1988-01-26

Applicant: IBM

Inventor： CHANG ALBERT ,  SHAHEEN-GOUDA AMAL AHMED ,  NEUMAN GROVER HERBERT ,  SMITH TODD ALLEN

IPC: G06F12/00 ,  G06F12/08

Abstract: In a distributed environment several data processing systems are interconnected across a network system (3). A distributed services program installed on the systems in the network allows the processors to access data files (5) distributed across the various nodes (A,B) of the network without regard to the location of the data file in the network. The processing system accessing the file, referred to as the client processing system, utilizes a client cache (12B) within its operating system (11B) to store the data file. Utilizing the client cache minimizes the number of reads and writes that must go over the network (3) to the server processing system where the file physically resides. The system and method of this invention prevents a process in the client processing system from accessing data in the client cache that has been modified at another node (A) in the network. The blocks of data in the client cache (12B) are tested for validity in the client processing system by using modification times as measured by the server processing system. If the cache data blocks are determined to be valid, the data is accessed from the client cache. If the cache data blocks are determined to be invalid, the data blocks are discarded, and the file is accessed from the server processing system.

公开(公告)号：DE3373034D1

公开(公告)日：1987-09-17

申请号：DE3373034

申请日：1983-08-23

Applicant: IBM

Inventor： GAUDET JAMES LOUIS ,  LINEMAN HARRY LEE ,  CHUKRAN RUDOLPH EDWARD ,  NEUMAN GROVER HERBERT ,  BARNES JOHNNY GENNIE

IPC: G06F3/12 ,  G06F17/21 ,  G06F40/189 ,  G06F15/20

Abstract: In order to avoid the problem of the last line of the body text not being justified when it is not the end of a paragraph but is followed by a footer, a converter/processor (13) is provided to modify the print data stream produced by another converter/processor (12) from the revisable or editable text data stream. If during conversion from the revisable data stream to the print data stream a "last body text line" is found and it is not the end of a paragraph, a latch (34) is set. Then, with each line of print data stream text, the latch is checked, and if the latch is set and the text line ends with a carriage return, the carriage return is replaced with a zero-index-carriage return and an index. These act similar to a carriage return in all cases except one - the text line which they terminate may now be justified.