Thread-Specific Data
Global data item - each thread has a different value.
Pthreads uses a Key/Value model.
Cumbersome and expensive to access.
- Use data structures rather than separate keys.
One thread creates a key.
- Can supply a destructor function.
- Key must be in memory accessible to all threads.
errno - is a special case.
From THREADTIME: by Norton/Dipasquale Prentice-Hall.
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