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|Linker and Libraries Guide Oracle Solaris 11 Information Library|
The compilation environment supports the declaration of thread-local data. This data is sometimes referred to as thread-specific, or thread-private data, but more typically by the acronym TLS. By declaring variables to be thread-local, the compiler automatically arranges for these variables to be allocated on a per-thread basis.
The built-in support for this feature serves three purposes.
A foundation is provided upon which the POSIX interfaces for allocating thread specific data are built.
A convenient, and efficient mechanism for direct use of thread local variables by applications and libraries is provided.
Compilers can allocate TLS as necessary when performing loop-parallelizing optimizations.