class WireWeakOnewayBufferClientImpl

Allocates a buffer collection on behalf of a single client (aka

initiator) who is also the only participant (from the point of view of

sysmem).

This call exists mainly for temp/testing purposes. This call skips the

[`fuchsia.sysmem2/BufferCollectionToken`] stage, so there's no way to

allow another participant to specify its constraints.

Real clients are encouraged to use

[`fuchsia.sysmem2/Allocator.AllocateSharedCollection`] instead, and to

let relevant participants directly convey their own constraints to

sysmem by sending `BufferCollectionToken`s to those participants.

+ request `collection_request` The server end of the

[`fuchsia.sysmem2/BufferCollection`].

Caller provides the backing storage for FIDL message.

Creates a root [`fuchsia.sysmem2/BufferCollectionToken`].

The `BufferCollectionToken` can be "duplicated" for distribution to

participants by using

[`fuchsia.sysmem2/BufferCollectionToken.Duplicate`]. Each

`BufferCollectionToken` can be converted into a

[`fuchsia.sysmem2.BufferCollection`] using

[`fuchsia.sysmem2/Allocator.BindSharedCollection`].

Buffer constraints can be set via

[`fuchsia.sysmem2/BufferCollection.SetConstraints`].

Success/failure to populate the buffer collection with buffers can be

determined from

[`fuchsia.sysmem2/BufferCollection.WaitForAllBuffersAllocated`].

Closing the client end of a `BufferCollectionToken` or

`BufferCollection` (without `Release` first) will fail all client ends

in the same failure domain, which by default is all client ends of the

buffer collection. See

[`fuchsia.sysmem2/BufferCollection.SetDispensable`] and

[`fuchsia.sysmem2/BufferCollection.AttachToken`] for ways to create

separate failure domains within a buffer collection.

Caller provides the backing storage for FIDL message.

Convert a [`fuchsia.sysmem2/BufferCollectionToken`] into a

[`fuchsia.sysmem2/BufferCollection`].

At the time of sending this message, the buffer collection hasn't yet

been populated with buffers - the participant must first also send

[`fuchsia.sysmem2/BufferCollection.SetConstraints`] via the

`BufferCollection` client end.

All `BufferCollectionToken`(s) duplicated from a root

`BufferCollectionToken` (created via `AllocateSharedCollection`) must be

"turned in" via `BindSharedCollection` (or `Release`ed), and all

existing `BufferCollection` client ends must have sent `SetConstraints`

before the logical BufferCollection will be populated with buffers (or

will fail if the overall set of constraints can't be satisfied).

+ request `token` The client endpoint of a channel whose server end was

sent to sysmem using

[`fuchsia.sysmem2/Allocator.AllocateSharedCollection`] or whose server

end was sent to sysmem using

[`fuchsia.sysmem2/BufferCollectionToken.Duplicate`]. The token is

being "turned in" in exchange for a

[`fuchsia.sysmem2/BufferCollection`].

+ request `buffer_collection_request` The server end of a

[`fuchsia.sysmem2/BufferCollection`] channel. The sender retains the

client end. The `BufferCollection` channel is a single participant's

connection to the logical buffer collection. Typically there will be

other participants with their own `BufferCollection` channel to the

logical buffer collection.

Caller provides the backing storage for FIDL message.

Set information about the current client that can be used by sysmem to

help diagnose leaking memory and allocation stalls waiting for a

participant to send [`fuchsia.sysmem2/BufferCollection.SetConstraints`].

This sets the debug client info on all [`fuchsia.sysmem2/Node`](s)

subsequently created by this this [`fuchsia.sysmem2/Allocator`]

including any [`fuchsia.sysmem2/BufferCollection`](s) created via

[`fuchsia.sysmem2/Allocator.BindSharedCollection`] (in the absence of

any prior call to [`fuchsia.sysmem2/Allocator.SetDebugClientInfo`],

these `BufferCollection`(s) have the same initial debug client info as

the token turned in to create the `BufferCollection`).

This info can be subsequently overridden on a per-`Node` basis by

sending [`fuchsia.sysmem2/Node.SetDebugClientInfo`].

Sending [`fuchsia.sysmem2/Allocator.SetDebugClientInfo`] once per

`Allocator` is the most efficient way to ensure that all

[`fuchsia.sysmem2/Node`](s) will have at least some debug client info

set, and is also more efficient than separately sending the same debug

client info via [`fuchsia.sysmem2/Node.SetDebugClientInfo`] for each

created [`fuchsia.sysmem2/Node`].

+ request `name` This can be an arbitrary string, but the current

process name (see `fsl::GetCurrentProcessName`) is a good default.

+ request `id` This can be an arbitrary id, but the current process ID

(see `fsl::GetCurrentProcessKoid`) is a good default.

Caller provides the backing storage for FIDL message.