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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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3
src/include/storage/buf_internals.h
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@@ -21,6 +21,7 @@
#include "storage/bufmgr.h"
#include "storage/condition_variable.h"
#include "storage/lwlock.h"
#include "storage/procnumber.h"
#include "storage/shmem.h"
#include "storage/smgr.h"
#include "storage/spin.h"
@@ -86,6 +87,8 @@ StaticAssertDecl(BUF_REFCOUNT_BITS + BUF_USAGECOUNT_BITS + BUF_FLAG_BITS == 32,
StaticAssertDecl(BM_MAX_USAGE_COUNT < (1 << BUF_USAGECOUNT_BITS),
"BM_MAX_USAGE_COUNT doesn't fit in BUF_USAGECOUNT_BITS bits");
StaticAssertDecl(MAX_BACKENDS_BITS <= BUF_REFCOUNT_BITS,
"MAX_BACKENDS_BITS needs to be <= BUF_REFCOUNT_BITS");
/*
* Buffer tag identifies which disk block the buffer contains.