Date: Thu, 14 Aug 1997 17:07:57 +0200 From: Poul-Henning Kamp <phk@dk.tfs.com> To: smp@freebsd.org Subject: bug ? Message-ID: <3398.871571277@critter.dk.tfs.com>
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this is from sys/kern/kern_lock.c, isn't line 76 & 77 bogus ?
64 | */
65 | int lock_wait_time = 100;
66 | #define PAUSE(lkp, wanted) \
67 | if (lock_wait_time > 0) { \
68 | int i; \
69 | \
70 | simple_unlock(&lkp->lk_interlock); \
71 | for (i = lock_wait_time; i > 0; i--) \
72 | if (!(wanted)) \
73 | break; \
74 | simple_lock(&lkp->lk_interlock); \
75 | } \
76 | if (!(wanted)) \
77 | break;
78 |
79 | #else /* NCPUS == 1 */
80 |
81 | /*
82 | * It is an error to spin on a uniprocessor as nothing will ever cause
83 | * the simple lock to clear while we are executing.
84 | */
85 | #define PAUSE(lkp, wanted)
86 |
87 | #endif /* NCPUS == 1 */
88 |
89 | /*
90 | * Acquire a resource.
91 | */
92 | #define ACQUIRE(lkp, error, extflags, wanted) \
93 | PAUSE(lkp, wanted); \
94 | for (error = 0; wanted; ) { \
95 | (lkp)->lk_waitcount++; \
--
Poul-Henning Kamp | phk@FreeBSD.ORG FreeBSD Core-team.
http://www.freebsd.org/~phk | phk@login.dknet.dk Private mailbox.
whois: [PHK] | phk@tfs.com TRW Financial Systems, Inc.
Future will arrive by its own means, progress not so.
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