公开(公告)号：CA2427278A1

公开(公告)日：2004-10-30

申请号：CA2427278

申请日：2003-04-30

Applicant: IBM CANADA

Inventor： LIND JON A ,  XUE XUN ,  KALMUK DAVID C ,  PEREYRA HEBERT W

IPC: G06F9/445 ,  G06F9/46 ,  G06F15/163

Abstract: An operating system directed to using special properties of a common inter- process communications mechanism (IPC), namely UNIX domain socket-pairs or stream- pipes alternatively as a storage medium for file-descriptors of UNIX processes. Wh en a file-descriptor is written into a socket-pair, and closed in the UNIX proces s, the file remains open, but occupies no space in the process file-table. The file-descriptor m ay later be read out of the socket-pair to reestablish it in the file-table, and access it. This property is implemented in an IPC mechanism of UNIX operating system whereby a process such as a dispatcher may manage more connections and processes than its file-table siz e allow. This provides scalability improvements of the UNIX operating system.

公开(公告)号：CA2427278C

公开(公告)日：2009-02-03

申请号：CA2427278

申请日：2003-04-30

Applicant: IBM CANADA

Inventor： XUE XUN ,  LIND JON A ,  KALMUK DAVID C ,  PEREYRA HEBERT W

IPC: G06F15/163 ,  G06F9/445 ,  G06F9/46 ,  G06F9/54

Abstract: An operating system directed to using special properties of a common inter- process communications mechanism (IPC), namely UNIX domain socket-pairs or stream- pipes alternatively as a storage medium for file-descriptors of UNIX processes. Wh en a file-descriptor is written into a socket-pair, and closed in the UNIX proces s, the file remains open, but occupies no space in the process file-table. The file-descriptor m ay later be read out of the socket-pair to reestablish it in the file-table, and access it. This property is implemented in an IPC mechanism of UNIX operating system whereby a process such as a dispatcher may manage more connections and processes than its file-table siz e allow. This provides scalability improvements of the UNIX operating system.

公开(公告)号：CA2415043A1

公开(公告)日：2004-06-23

申请号：CA2415043

申请日：2002-12-23

Applicant: IBM CANADA

Inventor： LIND JON A ,  PEREYRA HEBERT W ,  KALMUK DAVID C ,  XUE XUN

IPC: G06F16/176 ,  G06F17/30 ,  G06F13/14

Abstract: A communications multiplexor includes dispatcher processes for monitoring client connections. The dispatcher processes detect activity on those connections, and then pass active physical (client) connections to agent processes for servicing. Transfer is done through specific connection queues that are associated with a set of agents. A multi-queuing structure permits pooling of agents on a set of shared resources thereby reducing time require d to switch between different client connections. After an agent has serviced a given connection , the agent returns that connection to the agent's dispatcher (there is a static assignment between connections and dispatchers), and then reads the next unit of work from the agent's associat ed connection queue. This structure may be scalable while allowing optimal performance when passi ng physical connections between processes.

公开(公告)号：CA2293062A1

公开(公告)日：2001-06-22

申请号：CA2293062

申请日：1999-12-22

Applicant: IBM CANADA

Inventor： VINCENT TIM J ,  LIND JON A ,  XUE XUN ,  SHUM PETER K L ,  PEREYRA HEBERT W

IPC: H04L29/06 ,  H04L29/08 ,  H04L29/02 ,  G11B23/00 ,  G06F17/30 ,  G06F17/60 ,  H04L12/66

Abstract: A gateway provides communication of tightly coupled XA transactions to a server hosting a DBMS and makes efficient use of domain socket pairs to implement demultiplexing in the gateway. The gateway includes a TCP/IP listener process which accepts connection requests from a transaction manager. Logical agents represent the application connection a nd are managed by a logical agent scheduler and are passed within the gateway using domain socke t pairs. Gateway agents are dedicated to identified tightly coupled XA transactions to provid e tightly coupled XA transaction support for DBMS systems which do not provide such support directly. The domain socket pairs in the gateway are assigned to logical agent schedulers and are available in a domain socket pool. A wait queue is provided to buffer logical agents when connecti on to the server is not available or where there are no domain socket pairs available in the domain socket pool. The wait queue is itself implemented as a domain socket pair.