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Commitae72283

Browse files
author
Neil Conway
committed
Cleanup some ancient Ultrix / Alpha code in main() that is intended to
modify how unaligned memory accesses are dealt with. Document that thisis really what is going on, and merge the NOFIXADE and NOPRINTADE codepaths.
1 parent3331180 commitae72283

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1 file changed

+13
-8
lines changed

1 file changed

+13
-8
lines changed

‎src/backend/main/main.c

Lines changed: 13 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,7 @@
1313
*
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*
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* IDENTIFICATION
16-
* $PostgreSQL: pgsql/src/backend/main/main.c,v 1.89 2004/08/29 05:06:43 momjian Exp $
16+
* $PostgreSQL: pgsql/src/backend/main/main.c,v 1.90 2004/09/2406:29:07 neilc Exp $
1717
*
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*-------------------------------------------------------------------------
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*/
@@ -71,18 +71,23 @@ main(int argc, char *argv[])
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7272
#if defined(__alpha)/* no __alpha__ ? */
7373
#ifdefNOFIXADE
74-
intbuffer[]= {SSIN_UACPROC,UAC_SIGBUS};
75-
#endif/* NOFIXADE */
76-
#ifdefNOPRINTADE
77-
intbuffer[]= {SSIN_UACPROC,UAC_NOPRINT};
78-
#endif/* NOPRINTADE */
74+
intbuffer[]= {SSIN_UACPROC,UAC_SIGBUS |UAC_NOPRINT};
75+
#endif
7976
#endif/* __alpha */
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8178
#ifdefWIN32
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char*env_locale;
8380
#endif
8481

85-
#if defined(NOFIXADE)|| defined(NOPRINTADE)
82+
/*
83+
* On some platforms, unaligned memory accesses result in a kernel
84+
* trap; the default kernel behavior is to emulate the memory
85+
* access, but this results in a significant performance
86+
* penalty. We ought to fix PG not to make such unaligned memory
87+
* accesses, so this code disables the kernel emulation: unaligned
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* accesses will result in SIGBUS instead.
89+
*/
90+
#ifdefNOFIXADE
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#if defined(ultrix4)
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syscall(SYS_sysmips,MIPS_FIXADE,0,NULL,NULL,NULL);
@@ -94,7 +99,7 @@ main(int argc, char *argv[])
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write_stderr("%s: setsysinfo failed: %s\n",
95100
argv[0],strerror(errno));
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#endif
97-
#endif/* NOFIXADE|| NOPRINTADE*/
102+
#endif/* NOFIXADE */
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99104
#if defined(WIN32)
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{

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