6.6 Summary
The strong integration of locks into the Java language and API is
very useful for programming with Java threads. Java also provides
very strong tools to allow thread programming at a higher level. With
these tools, Java provides a comprehensive library to use for your
multithreaded programs.
Even with this library, threaded programming is not easy. The
developer needs to understand the issues of deadlock and starvation,
in order to design applications in a concurrent fashion. While it is
not possible to have a program threaded automatically梬ith a
combination of using the more advanced tools and development
practices, it can be very easy to design and debug threaded programs.
6.6.1 Example Classes
Here are the class names and Ant targets for the examples in this
chapter:
|
Description
|
Main Java class
|
Ant target
|
|---|
|
Deadlock-detecting Lock
|
javathreads.examples.ch06.example1.DeadlockDetectingLock
|
ch6-ex1
| |
Alternate Deadlock-detecting Lock
|
javathreads.examples.ch06.example2.AlternateDeadlockDetectingLock
|
ch6-ex2
|
Three tests are available for each example. The first test uses two
threads and two competing locks. The second test uses three threads
and three competing locks. The third test uses condition variables to
cause the deadlock. Test numbers are selected with this property:
<property name="DeadlockTestNumber" value="2"/>
| 
