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Remove dsm_resize() and dsm_remap().

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These interfaces were never used in core, didn't handle failure of
posix_fallocate() correctly and weren't supported on all platforms.
We agreed to remove them in 12.

Author: Thomas Munro
Reported-by: Andres Freund
Discussion: https://postgr.es/m/CAA4eK1%2B%3DyAFUvpFoHXFi_gm8YqmXN-TtkFH%2BVYjvDLS6-SFq-Q%40mail.gmail.com
This commit is contained in:
Thomas Munro
2018-11-06 16:11:12 +13:00
parent b0a1ff8a6a
commit 3c60d0fa23
4 changed files with 12 additions and 174 deletions
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32
src/backend/storage/ipc/dsm.c
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@@ -653,38 +653,6 @@ dsm_detach_all(void)
&dsm_control_mapped_size, ERROR);
}
/*
* Resize an existing shared memory segment.
*
* This may cause the shared memory segment to be remapped at a different
* address. For the caller's convenience, we return the mapped address.
*/
void *
dsm_resize(dsm_segment *seg, Size size)
{
Assert(seg->control_slot != INVALID_CONTROL_SLOT);
dsm_impl_op(DSM_OP_RESIZE, seg->handle, size, &seg->impl_private,
&seg->mapped_address, &seg->mapped_size, ERROR);
return seg->mapped_address;
}
/*
* Remap an existing shared memory segment.
*
* This is intended to be used when some other process has extended the
* mapping using dsm_resize(), but we've still only got the initial
* portion mapped. Since this might change the address at which the
* segment is mapped, we return the new mapped address.
*/
void *
dsm_remap(dsm_segment *seg)
{
dsm_impl_op(DSM_OP_ATTACH, seg->handle, 0, &seg->impl_private,
&seg->mapped_address, &seg->mapped_size, ERROR);
return seg->mapped_address;
}
/*
* Detach from a shared memory segment, destroying the segment if we
* remove the last reference.