/Users/deen/code/yugabyte-db/src/postgres/src/include/storage/buf.h
Line | Count | Source (jump to first uncovered line) |
1 | | /*------------------------------------------------------------------------- |
2 | | * |
3 | | * buf.h |
4 | | * Basic buffer manager data types. |
5 | | * |
6 | | * |
7 | | * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group |
8 | | * Portions Copyright (c) 1994, Regents of the University of California |
9 | | * |
10 | | * src/include/storage/buf.h |
11 | | * |
12 | | *------------------------------------------------------------------------- |
13 | | */ |
14 | | #ifndef BUF_H |
15 | | #define BUF_H |
16 | | |
17 | | /* |
18 | | * Buffer identifiers. |
19 | | * |
20 | | * Zero is invalid, positive is the index of a shared buffer (1..NBuffers), |
21 | | * negative is the index of a local buffer (-1 .. -NLocBuffer). |
22 | | */ |
23 | | typedef int Buffer; |
24 | | |
25 | 58.0M | #define InvalidBuffer 0 |
26 | | |
27 | | /* |
28 | | * BufferIsInvalid |
29 | | * True iff the buffer is invalid. |
30 | | */ |
31 | 0 | #define BufferIsInvalid(buffer) ((buffer) == InvalidBuffer) |
32 | | |
33 | | /* |
34 | | * BufferIsLocal |
35 | | * True iff the buffer is local (not visible to other backends). |
36 | | */ |
37 | 796k | #define BufferIsLocal(buffer) ((buffer) < 0) |
38 | | |
39 | | /* |
40 | | * Buffer access strategy objects. |
41 | | * |
42 | | * BufferAccessStrategyData is private to freelist.c |
43 | | */ |
44 | | typedef struct BufferAccessStrategyData *BufferAccessStrategy; |
45 | | |
46 | | #endif /* BUF_H */ |