POSIX threads
The pthreads library is a set of C calls that provides a mechanism for writing multithreaded code. There are three major classes of calls in this library:
1. calls to create and destroy threads.
2. calls to synchronize threads and lock program resources.
3. calls to manage thread scheduling.
Below, we'll discuss the first two classes in detail.
The third class will not be considered in this document. Thread scheduling can not only considerably complicate your algorithm, but it can also get you into trouble when migrating your code from uniprocessor to multiprocessor machines. From what I have seen so far, fiddling with thread priorities isn't worth the trouble in many scientific applications, anyway.
Each thread sees the same global data and files; however, each thread has its own stack and registers (so that variables in the automatic and register storage classes are private).
----------------------------------------------------------------------- | Process || | | ------- ------------- ------------- ------------- || | Files | | Thread | | Thread | | Thread | || ------- | ----------- | | ----------- | | ----------- | || || Registers || || Registers || || Registers || || | ----------- | | ----------- | | ----------- | ||
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