[m-rev.] for review: thread-local storage

[Julien Fischer]

On Mon, 3 Jul 2006, Peter Wang wrote:

> On saturn, for a program sitting in a tight loop only, asm_jump.par.gc
> is ~6 times faster after this patch.  asm_jump.gc is still ~1.4 times
> faster than that.
>
>
> Estimated hours taken: 5
> Branches: main
>
> When possible, make use of the gcc `__thread' extension for introducing
> thread-local variables.  Currently we use the POSIX thread facility for storing
> the address of the Mercury engine that is running on the current thread, i.e.
> pthread_getspecific/pthread_setspecific.  If gcc global registers are not
> used, then each access of a Mercury register incurs a call to
> `pthread_getspecific'.  Using the `__thread' extension is very much faster.
>
> (If gcc global registers are used then the address of the Mercury engine is
> kept in a hardward register.)
>
>
> configure.in:
> 	Check if compiler has the `__thread' extension.
>
> runtime/mercury_conf.h.in:
> 	#define MR_TLS if `__thread' can be used.
>

I would prefer MR_THREAD_LOCAL_STORAGE as opposed to MR_TLS.

Julien.
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