1. CIS 552 Advanced Unix Programming
Professor Spiegel
Kutztown University

2. Interprocess Communication Threads? (maybe) Process Coordination
Topics:
Concurrency
Unix Internals
pipe, fork, exec, wait, signals, etc;
Interprocess Communication
Shared Memory, Semaphores, Message Queues?
Threads? (maybe)
Process Coordination
Critical Sections
Deadlock
Topic List

3. Here’s where we start
Time – used to order events
Event – A (potentially) sensed change
Process – An executing program
Is a program an executing process?
No. A program can, when executed, cause the occurrence of multiple processes

4. A Couple of Definitions
n. union; concurrence of events
Concurrent – adj. acting in conjunction; agreeing; taking place at the same time; accompanying; n. a joint or contributory cause
Concurrently – adv. to run together
Parallel – adv. continuously at equal distance apart; precisely corresponding; similar; n. a line equidistant from another at all points; a thing exactly like another

5. Precedence Graphs Directed Edge – Arrow from one node to another e.g.B
Assume A & B are processes
A occurs before (precedes) B,
OR, B occurs after (follows) A A A B C D
Sequential
Facts:
A precedes B
A precedes C
A precedes D
B precedes D
C precedes D
Question:
What is B’s relationship to C? B D A C

6. Compiling & Debugging Run gdb under emacs to debug your programs
Manual is available at URL:
You must also be able to write makefiles on your own
Manual is available at URL:
There is a link to each of these on my faculty home page