Floating World: Threads
The discussion has been expanded with technical details of specific weaves by the Japanese scholar Keiko Kusakabe, a PhD candidate who has been trekking through the difficult terrain of West and northern South Sulawesi for over a decade in her quest for information on traditional textile production techniques in the region.
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Keiko keeps these techniques alive by teaching them to her students in Japan. Judi Achjadi, a Canadian, came to Indonesia in , the wife of an Indonesian diplomat, became an Indonesian citizen soon afterwards, and has spent the rest of her personal life studying traditional Indonesian dress, of which traditional textiles are an essential component.
Judi says she came in at a good time, when usage of Western dress was increasing exponentially but there were still elderly experts wanting to pass on their knowledge, so that it would not be lost. Floating Threads: Indonesian Songket and Similar Weaving Traditions Author: Judi Achjadi Floating Threads represents an attempt to catalogue float weave techniques used to decorate Batik cloth throughout the archipelago and hints at possible lines of distribution. Current Stock:.
Floating Point Errors and Large Scale Worlds
Description Floating Threads: Indonesian Songket and Similar Weaving Traditions Author: Judi Achjadi Floating Threads represents an attempt to catalogue float weave techniques used to decorate Batik cloth throughout the archipelago and hints at possible lines of distribution. How To Use. Rating Required Select Rating 1 star worst 2 stars 3 stars average 4 stars 5 stars best. Email Required. Review Subject Required. As NeedForSynchronizationDemo demonstrates, threads' execution orders are unpredictable.
There is no guarantee that a thread can complete its critical code section before some other thread enters that section. Hence, we have a race condition, which causes inconsistencies. To prevent race conditions, each thread must complete its critical code section before another thread enters either the same critical code section or another related critical code section that manipulates the same shared variables or resources.
With no means of serializing access—that is, allowing access to only one thread at a time —to a critical code section, you can't prevent race conditions or inconsistencies. Fortunately, Java provides a way to serialize thread access: through its synchronization mechanism. Note : Of Java's types, only long integer and double-precision floating-point variables are prone to inconsistencies.
A bit JVM typically accesses a bit long integer variable or a bit double-precision floating-point variable in two adjacent bit steps. One thread might complete the first step and then wait while another thread executes both steps. Then, the first thread might awake and complete the second step, producing a variable with a value different from either the first or second thread's value.
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Java provides a synchronization mechanism for preventing more than one thread from executing code in one or more critical code sections at any point in time. That mechanism bases itself on the concepts of monitors and locks. Think of a monitor as a protective wrapper around a critical code section and a lock as a software entity that a monitor uses to prevent multiple threads from entering the monitor.
The idea is this: When a thread wishes to enter a monitor-guarded critical code section, that thread must acquire the lock associated with an object that associates with the monitor.
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Each object has its own lock. When the thread in the monitor releases the lock, the JVM removes the waiting thread from the monitor's waiting area and allows that thread to acquire the lock and proceed to the monitor's critical code section. Fortunately, you do not need to work at such a low level. Instead, you can use Java's synchronized keyword in the context of the synchronized statement and synchronized methods. Some critical code sections occupy small portions of their enclosing methods.
To guard multiple thread access to such critical code sections, you use the synchronized statement. That statement has the following syntax:. The synchronized statement begins with keyword synchronized and continues with an objectidentifier, which appears between a pair of round brackets. The objectidentifier references an object whose lock associates with the monitor that the synchronized statement represents.
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Finally, the Java statements' critical code section appears between a pair of brace characters. How do you interpret the synchronized statement? Consider the following code fragment:.
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