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mdbx: use MAP_CONCEAL when available (compatibility).

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This commit is contained in:
Leonid Yuriev 2019-11-13 15:56:35 +03:00
parent d47c4eeb78
commit 057812fe02
1 changed files with 20 additions and 11 deletions
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31
src/elements/osal.c
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@ -1249,19 +1249,28 @@ MDBX_INTERNAL_FUNC int mdbx_mmap(const int flags, mdbx_mmap_t *map,
#else
#ifndef MAP_TRYFIXED
#define MAP_TRYFIXED 0
#endif
#ifndef MAP_HASSEMAPHORE
#define MAP_HASSEMAPHORE 0
#endif
#ifndef MAP_CONCEAL
#define MAP_CONCEAL 0
#endif
#ifndef MAP_NOSYNC
#define MAP_NOSYNC 0
#endif
map->address = mmap(
NULL, limit, (flags & MDBX_WRITEMAP) ? PROT_READ | PROT_WRITE : PROT_READ,
MAP_SHARED | MAP_FILE
#ifdef MAP_NOSYNC
| (((options & MMAP_OPTION_SEMAPHORE) != 0 ||
F_ISSET(flags, MDBX_UTTERLY_NOSYNC))
? MAP_NOSYNC
: 0)
#endif
#ifdef MAP_HASSEMAPHORE
| ((options & MMAP_OPTION_SEMAPHORE) ? MAP_HASSEMAPHORE : 0)
#endif
,
MAP_SHARED | MAP_FILE |
(F_ISSET(flags, MDBX_UTTERLY_NOSYNC) ? MAP_NOSYNC : 0) |
((options & MMAP_OPTION_SEMAPHORE) ? MAP_HASSEMAPHORE | MAP_NOSYNC
: MAP_CONCEAL),
map->fd, 0);
if (unlikely(map->address == MAP_FAILED)) {