6666 * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
6767 * Portions Copyright (c) 1994, Regents of the University of California
6868 *
69- * $PostgreSQL: pgsql/src/include/storage/s_lock.h,v 1.142 2005/10/11 20:41:32 tgl Exp $
69+ * $PostgreSQL: pgsql/src/include/storage/s_lock.h,v 1.143 2005/12/17 20:15:43 momjian Exp $
7070 *
7171 *-------------------------------------------------------------------------
7272 */
108108 */
109109
110110
111- #ifdef __i386__
111+ #ifdef __i386__ /* 32-bit i386 */
112112#define HAS_TEST_AND_SET
113113
114114typedef unsignedchar slock_t ;
@@ -214,8 +214,7 @@ spin_delay(void)
214214#endif /* __x86_64__ */
215215
216216
217- #if defined(__ia64__ )|| defined(__ia64 )
218- /* Intel Itanium */
217+ #if defined(__ia64__ )|| defined(__ia64 )/* Intel Itanium */
219218#define HAS_TEST_AND_SET
220219
221220typedef unsignedint slock_t ;
@@ -276,8 +275,8 @@ tas(volatile slock_t *lock)
276275#endif /* __arm__ */
277276
278277
279- #if defined(__s390__ )|| defined(__s390x__ )
280278/* S/390 and S/390x Linux (32- and 64-bit zSeries) */
279+ #if defined(__s390__ )|| defined(__s390x__ )
281280#define HAS_TEST_AND_SET
282281
283282typedef unsignedint slock_t ;
@@ -300,7 +299,7 @@ tas(volatile slock_t *lock)
300299#endif /* __s390__ || __s390x__ */
301300
302301
303- #if defined(__sparc__ )
302+ #if defined(__sparc__ )/* Sparc */
304303#define HAS_TEST_AND_SET
305304
306305typedef unsignedchar slock_t ;
@@ -323,6 +322,7 @@ tas(volatile slock_t *lock)
323322#endif /* __sparc__ */
324323
325324
325+ /* PowerPC */
326326#if defined(__ppc__ )|| defined(__powerpc__ )|| defined(__powerpc64__ )
327327#define HAS_TEST_AND_SET
328328
@@ -366,14 +366,15 @@ tas(volatile slock_t *lock)
366366/* PowerPC S_UNLOCK is almost standard but requires a "sync" instruction */
367367#define S_UNLOCK (lock )\
368368do \
369- {\
369+ {
370370__asm__ __volatile__ ("sync \n"); \
371371*((volatile slock_t *) (lock)) = 0; \
372372} while (0)
373373
374374#endif /* powerpc */
375375
376376
377+ /* Linux Motorola 68k */
377378#if (defined(__mc68000__ )|| defined(__m68k__ ))&& defined(__linux__ )
378379#define HAS_TEST_AND_SET
379380
@@ -399,11 +400,11 @@ tas(volatile slock_t *lock)
399400#endif /* (__mc68000__ || __m68k__) && __linux__ */
400401
401402
402- #if defined(__vax__ )
403403/*
404404 * VAXen -- even multiprocessor ones
405405 * (thanks to Tom Ivar Helbekkmo)
406406 */
407+ #if defined(__vax__ )
407408#define HAS_TEST_AND_SET
408409
409410typedef unsignedchar slock_t ;
@@ -429,7 +430,7 @@ tas(volatile slock_t *lock)
429430#endif /* __vax__ */
430431
431432
432- #if defined(__ns32k__ )
433+ #if defined(__ns32k__ )/* National Semiconductor 32K */
433434#define HAS_TEST_AND_SET
434435
435436typedef unsignedchar slock_t ;
@@ -453,7 +454,7 @@ tas(volatile slock_t *lock)
453454#endif /* __ns32k__ */
454455
455456
456- #if defined(__alpha )|| defined(__alpha__ )
457+ #if defined(__alpha )|| defined(__alpha__ )/* Alpha */
457458/*
458459 * Correct multi-processor locking methods are explained in section 5.5.3
459460 * of the Alpha AXP Architecture Handbook, which at this writing can be
499500#endif /* __alpha || __alpha__ */
500501
501502
502- #if defined(__mips__ )&& !defined(__sgi )
503+ #if defined(__mips__ )&& !defined(__sgi )/* non-SGI MIPS */
503504/* Note: on SGI we use the OS' mutex ABI, see below */
504505/* Note: R10000 processors require a separate SYNC */
505506#define HAS_TEST_AND_SET
553554/* These live in s_lock.c, but only for gcc */
554555
555556
556- #if defined(__m68k__ )&& !defined(__linux__ )
557+ #if defined(__m68k__ )&& !defined(__linux__ )/* non-Linux Motorola 68k */
557558#define HAS_TEST_AND_SET
558559
559560typedef unsignedchar slock_t ;