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mdbx: portability - allows operation without mremap().

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Change-Id: I7fed42d51259e582e9dbc401c78f7f829a80f71c
This commit is contained in:
Leonid Yuriev 2019-07-14 00:39:17 +03:00
parent 97e4f66d16
commit 41f00485fd
1 changed files with 13 additions and 3 deletions
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16
src/osal.c
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@ -1147,11 +1147,21 @@ retry_mapview:;
return rc;
#else
if (limit != map->length) {
void *ptr = mremap(map->address, map->length, limit, MREMAP_MAYMOVE);
if (ptr == MAP_FAILED)
return errno;
#if defined(_GNU_SOURCE) && !defined(__FreeBSD__)
void *ptr = mremap(map->address, map->length, limit,
/* LY: in case changing the mapping size calling code
must guarantees the absence of competing threads, and
a willingness to another base address */
MREMAP_MAYMOVE);
if (ptr == MAP_FAILED) {
int err = errno;
return (err == EAGAIN || err == ENOMEM) ? MDBX_RESULT_TRUE : err;
}
map->address = ptr;
map->length = limit;
#else
return MDBX_RESULT_TRUE;
#endif /* mremap() <= _GNU_SOURCE && !__FreeBSD__ */
}
return (flags & MDBX_RDONLY) ? MDBX_SUCCESS : mdbx_ftruncate(map->fd, size);
#endif