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Add static asserts for MAX_BACKENDS limiting factors

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So far the various dependencies were documented in the comment above
MAX_BACKENDS, but not checked.

Discussion: https://postgr.es/m/CA+COZaBO_s3LfALq=b+HcBHFSOEGiApVjrRacCe4VP9m7CJsNQ@mail.gmail.com
This commit is contained in:
Andres Freund
2025-02-24 05:39:27 -05:00
parent 418451bfe1
commit 5ee75e32fa
3 changed files with 11 additions and 0 deletions
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5
src/backend/utils/cache/inval.c vendored
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@@ -120,6 +120,7 @@
#include "catalog/catalog.h"
#include "catalog/pg_constraint.h"
#include "miscadmin.h"
#include "storage/procnumber.h"
#include "storage/sinval.h"
#include "storage/smgr.h"
#include "utils/catcache.h"
@@ -1651,6 +1652,10 @@ CacheInvalidateSmgr(RelFileLocatorBackend rlocator)
{
SharedInvalidationMessage msg;
/* verify optimization stated above stays valid */
StaticAssertStmt(MAX_BACKENDS_BITS <= 23,
"MAX_BACKEND_BITS is too big for inval.c");
msg.sm.id = SHAREDINVALSMGR_ID;
msg.sm.backend_hi = rlocator.backend >> 16;
msg.sm.backend_lo = rlocator.backend & 0xffff;