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Diffstat (limited to 'src/include/portability/mem.h')
| -rw-r--r-- | src/include/portability/mem.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/include/portability/mem.h b/src/include/portability/mem.h new file mode 100644 index 0000000..566d21f --- /dev/null +++ b/src/include/portability/mem.h @@ -0,0 +1,48 @@ +/*------------------------------------------------------------------------- + * + * mem.h + * portability definitions for various memory operations + * + * Copyright (c) 2001-2021, PostgreSQL Global Development Group + * + * src/include/portability/mem.h + * + *------------------------------------------------------------------------- + */ +#ifndef MEM_H +#define MEM_H + +#define IPCProtection (0600) /* access/modify by user only */ + +#ifdef SHM_SHARE_MMU /* use intimate shared memory on Solaris */ +#define PG_SHMAT_FLAGS SHM_SHARE_MMU +#else +#define PG_SHMAT_FLAGS 0 +#endif + +/* Linux prefers MAP_ANONYMOUS, but the flag is called MAP_ANON on other systems. */ +#ifndef MAP_ANONYMOUS +#define MAP_ANONYMOUS MAP_ANON +#endif + +/* BSD-derived systems have MAP_HASSEMAPHORE, but it's not present (or needed) on Linux. */ +#ifndef MAP_HASSEMAPHORE +#define MAP_HASSEMAPHORE 0 +#endif + +/* + * BSD-derived systems use the MAP_NOSYNC flag to prevent dirty mmap(2) + * pages from being gratuitously flushed to disk. + */ +#ifndef MAP_NOSYNC +#define MAP_NOSYNC 0 +#endif + +#define PG_MMAP_FLAGS (MAP_SHARED|MAP_ANONYMOUS|MAP_HASSEMAPHORE) + +/* Some really old systems don't define MAP_FAILED. */ +#ifndef MAP_FAILED +#define MAP_FAILED ((void *) -1) +#endif + +#endif /* MEM_H */ |