This is the email describing the changes in the patch for 7.4.
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Bruce Momjian wrote:
> Prompted by confusion over Itanium/Opterion, I have written a patch to
> improve the way we define spinlocks for platforms and cpu's. It
> basically decouples the OS from the CPU spinlock code. In almost all
> cases, the spinlock code cares only about the compiler and CPU, not the
> OS.
>
> The patch:
>
> o defines HAS_TEST_AND_SET inside each spinlock routine, not in
> platform-specific files
> o moves slock_t defines into the spinlock routines
> o remove NEED_{CPU}_TAS_ASM define because it is no longer needed
> o reports a compile error if spinlocks are not defined
> o adds a configure option --without-spinlocks to allow
> non-spinlock compiles
>
> Looking at the patch, I realize this is how we should have done it all
> along.
>
> It would be nice to report the lack of spinlocks in configure, rather
> than during the compile, but I can't compile s_lock.h and test for
> HAS_TEST_AND_SET until configure completes.
>
> I plan to apply this to 7.4.
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
359-1001+ If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square,
Pennsylvania19073
