M. J. Rochkind, Advanced UNIX Programming, Prentice-Hall, Englewood Cliffs, NJ, 1985.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....the file when the user has root privileges. Root can always perform this operation, even when the file already exists. In fact, old versions of Unix had this particular problem in the old editor ed the symptom was that occasionally portions of the password file would be placed in user s files [Rochkind 1985, 22] Instead, if you re creating a lock for processes that are on the local filesystem, you should use open( with the flags O WRONLY O CREAT O EXCL (and again, no permissions, so that other processes with the same owner won t get the lock) Note the use of O EXCL, which is the official way ....

....filesystem, you should use open( with the flags O WRONLY O CREAT O EXCL (and again, no permissions, so that other processes with the same owner won t get the lock) Note the use of O EXCL, which is the official way to create exclusive files; this even works for root on a local filesystem. [Rochkind 1985, 27] Second, if the lock file may be on an NFS mounted filesystem, then you have the problem that NFS version 2 doesn t completely support normal file semantics. This can even be a problem for work that s supposed to be local to a client, since some clients don t have local disks and may have ....

. Rochkind, Marc J. Advanced Unix Programming. Englewood Cliffs, NJ: Prentice-Hall, Inc. ISBN 0-13-011818-4.

....systems a process is an environment in which a program executes, providing areas for instructions and data. For example, a Unix process typically executes within a single thread of control, with direct access to user data in its own address space and access to system data via system calls [1]. Interprocess or shared memory communication may be used to provide data sharing between two or more processes, allowing for either truly concurrent operation on a multiprocessor, or pseudoconcurrent operation on a uniprocessor. The resulting computation may be viewed as multithreaded, with two ....

....register state, including all floating point registers, and the signal mask (if required) and restoring the next runnable thread s corresponding state. For portability, Ariadne accomplishes all this using the standard setjmp( and longjmp( subroutines 1 available in Unix environments [1]. Porting Ariadne entails rewriting only thread initialization code about 5 lines of assembly code on a SPARC ffl Ease of Use. The basic user interface is simple. Use of Ariadne requires a basic understanding of concurrent programming and C C . There is no limit placed on the number of ....

M. J. Rochkind, Advanced Unix Programming, Prentice Hall, 1985.

....We use the term greedy prefetching to refer to a process that outputs a stream of data to a queue as long as the queue is not full. A process that writes to a UNIX pipe is viewed as a greedy prefetching process because it does not wait for a read on the pipe unless the queue for the pipe is full [65]. The AudioFile system uses pipe semantics to connect an audio playback application to a device server using a fixed sized queue [39] Greedy prefetching uses a simple back pressure technique to synchronize a fast producer with slower consumer. So long as the queue is non empty, the consumer is ....

Rochkind, M. J. Advanced UNIX Programming. Prentice Hall, Englewood Cliffs, New Jersey, 1985.

....tries to guarantees an evenly distributed workload and tries to maximize the throughput of the system. 3.2. Installation of communication lines The interprocess communication interface of the REI is basically similar to the well know standardized communication protocol of UNIX systems [Rochkind85]. Each call to a message communication function returns a unique message identifier. These message identifiers allow to check the status of pending transfers. It is also possible to emulate signals with this construct. This provides the possibility to synchronize parallel processes. One important ....

Rochkind M., Advanced UNIX Programming, Prentice-Hall 1985

....Thus, one of the most crucial parts in the system development, which influences the overall system performance behavior, can be the design of the communication administration. Basically information exchange between collaborating processes is realized by the interprocess communication facilities [Rochkind, 1985] of the operating system of the underlying system architecture The factors of efficiency and usage of the interprocess facilities is of crucial importance for the performance of the whole system architecture. The efficiency is dependent on the operating system and cannot be influenced by the ....

....system. Therefore we state the following theorem. Theorem: The optimal PPU is defined by the PPU which can accommodate the longest LPU. This theorem is informally supported by the common rule of thumb that few larger units outperform many small units , which can be found in the literature [Rochkind, 1985]. We will prove this theorem heuristically by implementing protocols with different PPU length for an existing database system and measuring the overall throughput of the system. 5. Heuristic Analysis The Grid File Database System (GFDBS) is an advanved relational database system, which was ....

Rochkind M., Advanced UNIX Programming, Prentice-Hall, 1985

....It was tested and analyzed with an existing relational data base system. Processes and communication Large software applications in the industry consist mainly of several processes, which run timesliced (virtually parallel) on a hardware system and communicate via the interprocess facilities [Roch85] of the underlying operating system. This design is demanded by the conventional server slave architecture of centralized software systems. The slave processes are applications which represent the interface to users or other programs. In the following these programs are called user processes. The ....

....Therefore we state the following theorem. Theorem: The optimal PPU is defined by the PPU which can accommodate the longest LPU. This theorem is informal supported by the common rule of thumb, which can be found in the literature and which say: few larger units outperform many small units [Roch85]. 3 We use the commonly known grammar notation. Actions contained in square brackets [ and ] must be applied at least once. We will prove this theorem heuristically. We implemented protocols with different PPU length for an existing database system (the Grid File database system, GFDBS) and ....

Rochkind M., Advanced UNIX Programming, Prentice-Hall 1985

No context found.

M. J. Rochkind, Advanced UNIX Programming, Prentice-Hall, Englewood Cliffs, NJ, 1985.

No context found.

Marc J.Rochkind, Advanced UNIX Programming, Prentice-Hall, New Jersey, 1985

No context found.

Rochkind, Marc J. "Advanced UNIX Programming". New Jersey: Prentice Hall PTR, 1995.

No context found.

ROCHKIND, M.J. (1985). Advanced UNIX Programming. Prentice-Hall

No context found.

Rochkind, Advanced UNIX Programming, Prentice-Hall, Englewood Cliffs (1985).

No context found.

M. J. Rochkind, Advanced Unix Programming, Prentice Hall, 1985.

Online articles have much greater impact   More about CiteSeer.IST   Add search form to your site   Submit documents   Feedback  

CiteSeer.IST - Copyright Penn State and NEC