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<p>Global variables define regions of memory allocated at compilation time
instead of run-time. Global variables may optionally be initialized, may have
an explicit section to be placed in, and may
-have an optional explicit alignment specified. A
-variable may be defined as a global "constant," which indicates that the
+have an optional explicit alignment specified. A variable may be defined as
+"thread_local", which means that it will not be shared by threads (each thread
+will have a separated copy of the variable).
+A variable may be defined as a global "constant," which indicates that the
contents of the variable will <b>never</b> be modified (enabling better
optimization, allowing the global data to be placed in the read-only section of
an executable, etc). Note that variables that need runtime initialization