1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
// Copyright (c) 2016 The vulkano developers
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or https://opensource.org/licenses/MIT>,
// at your option. All files in the project carrying such
// notice may not be copied, modified, or distributed except
// according to those terms.
//! Traits and types for managing the allocation of command buffers and command pools.
//!
//! In Vulkano, creating a command buffer requires passing an implementation of the
//! [`CommandBufferAllocator`] trait. You can implement this trait yourself, or use the
//! Vulkano-provided [`StandardCommandBufferAllocator`].
use super::{
pool::{
CommandBufferAllocateInfo, CommandPool, CommandPoolAlloc, CommandPoolCreateInfo,
CommandPoolResetFlags,
},
CommandBufferLevel,
};
use crate::{
device::{Device, DeviceOwned},
instance::InstanceOwnedDebugWrapper,
Validated, VulkanError,
};
use crossbeam_queue::ArrayQueue;
use smallvec::{IntoIter, SmallVec};
use std::{
cell::{Cell, UnsafeCell},
error::Error,
fmt::Display,
marker::PhantomData,
mem::ManuallyDrop,
sync::Arc,
thread,
};
use thread_local::ThreadLocal;
const MAX_POOLS: usize = 32;
/// Types that manage the memory of command buffers.
///
/// # Safety
///
/// A Vulkan command pool must be externally synchronized as if it owned the command buffers that
/// were allocated from it. This includes allocating from the pool, freeing from the pool, resetting
/// the pool or individual command buffers, and most importantly recording commands to command
/// buffers. The implementation of `CommandBufferAllocator` is expected to manage this.
///
/// The destructors of the [`CommandBufferBuilderAlloc`] and the [`CommandBufferAlloc`] are expected
/// to free the command buffer, reset the command buffer, or add it to a pool so that it gets
/// reused. If the implementation frees or resets the command buffer, it must not forget that this
/// operation must be externally synchronized.
pub unsafe trait CommandBufferAllocator: DeviceOwned {
/// See [`allocate`](Self::allocate).
type Iter: Iterator<Item = Self::Builder>;
/// Represents a command buffer that has been allocated and that is currently being built.
type Builder: CommandBufferBuilderAlloc<Alloc = Self::Alloc>;
/// Represents a command buffer that has been allocated and that is pending execution or is
/// being executed.
type Alloc: CommandBufferAlloc;
/// Allocates command buffers.
///
/// Returns an iterator that contains the requested amount of allocated command buffers.
fn allocate(
&self,
queue_family_index: u32,
level: CommandBufferLevel,
command_buffer_count: u32,
) -> Result<Self::Iter, VulkanError>;
}
/// A command buffer allocated from a pool and that can be recorded.
///
/// # Safety
///
/// See [`CommandBufferAllocator`] for information about safety.
pub unsafe trait CommandBufferBuilderAlloc: DeviceOwned {
/// Return type of `into_alloc`.
type Alloc: CommandBufferAlloc;
/// Returns the internal object that contains the command buffer.
fn inner(&self) -> &CommandPoolAlloc;
/// Turns this builder into a command buffer that is pending execution.
fn into_alloc(self) -> Self::Alloc;
/// Returns the index of the queue family that the pool targets.
fn queue_family_index(&self) -> u32;
}
/// A command buffer allocated from a pool that has finished being recorded.
///
/// # Safety
///
/// See [`CommandBufferAllocator`] for information about safety.
pub unsafe trait CommandBufferAlloc: DeviceOwned + Send + Sync + 'static {
/// Returns the internal object that contains the command buffer.
fn inner(&self) -> &CommandPoolAlloc;
/// Returns the index of the queue family that the pool targets.
fn queue_family_index(&self) -> u32;
}
/// Standard implementation of a command buffer allocator.
///
/// The intended way to use this allocator is to have one that is used globally for the duration of
/// the program, in order to avoid creating and destroying [`CommandPool`]s, as that is expensive.
/// Alternatively, you can have one locally on a thread for the duration of the thread.
///
/// Internally, this allocator keeps one or more `CommandPool`s per queue family index per thread,
/// using Thread-Local Storage. When a thread first allocates, an entry is reserved for the thread
/// and queue family combination. After a thread exits and the allocator wasn't dropped yet, its
/// entries are freed, but the pools it used are not dropped. The next time a new thread allocates
/// for the first time, the entries are reused along with the pools. If all threads drop their
/// reference to the allocator, all entries along with the allocator are dropped, even if the
/// threads didn't exit yet, which is why you should keep the allocator alive for as long as you
/// need to allocate so that the pools can keep being reused.
///
/// This allocator only needs to lock when a thread first allocates or when a thread that
/// previously allocated exits. In all other cases, allocation is lock-free.
///
/// Command buffers can't be moved between threads during the building process, but finished command
/// buffers can. When a command buffer is dropped, it is returned back to the pool for reuse.
#[derive(Debug)]
pub struct StandardCommandBufferAllocator {
device: InstanceOwnedDebugWrapper<Arc<Device>>,
// Each queue family index points directly to its entry.
pools: ThreadLocal<SmallVec<[UnsafeCell<Option<Entry>>; 8]>>,
create_info: StandardCommandBufferAllocatorCreateInfo,
}
impl StandardCommandBufferAllocator {
/// Creates a new `StandardCommandBufferAllocator`.
#[inline]
pub fn new(device: Arc<Device>, create_info: StandardCommandBufferAllocatorCreateInfo) -> Self {
StandardCommandBufferAllocator {
device: InstanceOwnedDebugWrapper(device),
pools: ThreadLocal::new(),
create_info,
}
}
/// Tries to reset the [`CommandPool`] that's currently in use for the given queue family index
/// on the current thread.
///
/// If successful, the memory of the pool can be reused again along with all command buffers
/// allocated from it. This is only possible if all command buffers allocated from the pool
/// have been dropped.
///
/// This has no effect if the entry wasn't initialized yet or if the entry was [cleared].
///
/// # Panics
///
/// - Panics if `queue_family_index` is not less than the number of queue families.
///
/// [cleared]: Self::clear
#[inline]
pub fn try_reset_pool(
&self,
queue_family_index: u32,
flags: CommandPoolResetFlags,
) -> Result<(), Validated<ResetCommandPoolError>> {
if let Some(entry) = unsafe { &mut *self.entry(queue_family_index) }.as_mut() {
entry.try_reset_pool(flags)
} else {
Ok(())
}
}
/// Clears the entry for the given queue family index and the current thread. This does not
/// mean that the pools are dropped immediately. A pool is kept alive for as long as command
/// buffers allocated from it exist.
///
/// This has no effect if the entry was not initialized yet.
///
/// # Panics
///
/// - Panics if `queue_family_index` is not less than the number of queue families.
#[inline]
pub fn clear(&self, queue_family_index: u32) {
unsafe { *self.entry(queue_family_index) = None };
}
fn entry(&self, queue_family_index: u32) -> *mut Option<Entry> {
let pools = self.pools.get_or(|| {
self.device
.physical_device()
.queue_family_properties()
.iter()
.map(|_| UnsafeCell::new(None))
.collect()
});
pools[queue_family_index as usize].get()
}
}
unsafe impl CommandBufferAllocator for StandardCommandBufferAllocator {
type Iter = IntoIter<[StandardCommandBufferBuilderAlloc; 1]>;
type Builder = StandardCommandBufferBuilderAlloc;
type Alloc = StandardCommandBufferAlloc;
/// Allocates command buffers.
///
/// Returns an iterator that contains the requested amount of allocated command buffers.
///
/// # Panics
///
/// - Panics if the queue family index is not active on the device.
/// - Panics if `command_buffer_count` exceeds the count configured for the pool corresponding
/// to `level`.
#[inline]
fn allocate(
&self,
queue_family_index: u32,
level: CommandBufferLevel,
command_buffer_count: u32,
) -> Result<Self::Iter, VulkanError> {
// VUID-vkCreateCommandPool-queueFamilyIndex-01937
assert!(self
.device
.active_queue_family_indices()
.contains(&queue_family_index));
let entry = unsafe { &mut *self.entry(queue_family_index) };
if entry.is_none() {
let reserve = Arc::new(ArrayQueue::new(MAX_POOLS));
*entry = Some(Entry {
pool: Pool::new(
self.device.clone(),
queue_family_index,
reserve.clone(),
&self.create_info,
)?,
reserve,
});
}
let entry = entry.as_mut().unwrap();
// First try to allocate from existing command buffers.
if let Some(allocs) = entry.pool.allocate(level, command_buffer_count) {
return Ok(allocs);
}
// Else try to reset the pool.
if entry
.try_reset_pool(CommandPoolResetFlags::empty())
.is_err()
{
// If that fails too try to grab a pool from the reserve.
entry.pool = if let Some(inner) = entry.reserve.pop() {
Arc::new(Pool {
inner: ManuallyDrop::new(inner),
reserve: entry.reserve.clone(),
})
} else {
// Else we are unfortunately forced to create a new pool.
Pool::new(
self.device.clone(),
queue_family_index,
entry.reserve.clone(),
&self.create_info,
)?
};
}
Ok(entry.pool.allocate(level, command_buffer_count).unwrap())
}
}
unsafe impl<T: CommandBufferAllocator> CommandBufferAllocator for Arc<T> {
type Iter = T::Iter;
type Builder = T::Builder;
type Alloc = T::Alloc;
#[inline]
fn allocate(
&self,
queue_family_index: u32,
level: CommandBufferLevel,
command_buffer_count: u32,
) -> Result<Self::Iter, VulkanError> {
(**self).allocate(queue_family_index, level, command_buffer_count)
}
}
unsafe impl DeviceOwned for StandardCommandBufferAllocator {
#[inline]
fn device(&self) -> &Arc<Device> {
&self.device
}
}
#[derive(Debug)]
struct Entry {
// Contains the actual Vulkan command pool that is currently in use.
pool: Arc<Pool>,
// When a `Pool` is dropped, it returns itself here for reuse.
reserve: Arc<ArrayQueue<PoolInner>>,
}
// This is needed because of the blanket impl of `Send` on `Arc<T>`, which requires that `T` is
// `Send + Sync`. `Pool` is `Send + !Sync` because `CommandPool` is `!Sync`. That's fine however
// because we never access the Vulkan command pool concurrently. Same goes for the `Cell`s.
unsafe impl Send for Entry {}
impl Entry {
fn try_reset_pool(
&mut self,
flags: CommandPoolResetFlags,
) -> Result<(), Validated<ResetCommandPoolError>> {
if let Some(pool) = Arc::get_mut(&mut self.pool) {
unsafe {
pool.inner.inner.reset(flags).map_err(|err| match err {
Validated::Error(err) => {
Validated::Error(ResetCommandPoolError::VulkanError(err))
}
Validated::ValidationError(err) => err.into(),
})?
};
*pool.inner.primary_allocations.get_mut() = 0;
*pool.inner.secondary_allocations.get_mut() = 0;
Ok(())
} else {
Err(ResetCommandPoolError::InUse.into())
}
}
}
#[derive(Debug)]
struct Pool {
inner: ManuallyDrop<PoolInner>,
// Where we return the `PoolInner` in our `Drop` impl.
reserve: Arc<ArrayQueue<PoolInner>>,
}
#[derive(Debug)]
struct PoolInner {
// The Vulkan pool specific to a device's queue family.
inner: CommandPool,
// List of existing primary command buffers that are available for reuse.
primary_pool: Option<ArrayQueue<CommandPoolAlloc>>,
// List of existing secondary command buffers that are available for reuse.
secondary_pool: Option<ArrayQueue<CommandPoolAlloc>>,
// How many command buffers have been allocated from `self.primary_pool`.
primary_allocations: Cell<usize>,
// How many command buffers have been allocated from `self.secondary_pool`.
secondary_allocations: Cell<usize>,
}
impl Pool {
fn new(
device: Arc<Device>,
queue_family_index: u32,
reserve: Arc<ArrayQueue<PoolInner>>,
create_info: &StandardCommandBufferAllocatorCreateInfo,
) -> Result<Arc<Self>, VulkanError> {
let inner = CommandPool::new(
device,
CommandPoolCreateInfo {
queue_family_index,
..Default::default()
},
)
.map_err(Validated::unwrap)?;
let primary_pool = if create_info.primary_buffer_count > 0 {
let pool = ArrayQueue::new(create_info.primary_buffer_count);
for alloc in inner.allocate_command_buffers(CommandBufferAllocateInfo {
level: CommandBufferLevel::Primary,
command_buffer_count: create_info.primary_buffer_count as u32,
..Default::default()
})? {
let _ = pool.push(alloc);
}
Some(pool)
} else {
None
};
let secondary_pool = if create_info.secondary_buffer_count > 0 {
let pool = ArrayQueue::new(create_info.secondary_buffer_count);
for alloc in inner.allocate_command_buffers(CommandBufferAllocateInfo {
level: CommandBufferLevel::Secondary,
command_buffer_count: create_info.secondary_buffer_count as u32,
..Default::default()
})? {
let _ = pool.push(alloc);
}
Some(pool)
} else {
None
};
Ok(Arc::new(Pool {
inner: ManuallyDrop::new(PoolInner {
inner,
primary_pool,
secondary_pool,
primary_allocations: Cell::new(0),
secondary_allocations: Cell::new(0),
}),
reserve,
}))
}
fn allocate(
self: &Arc<Self>,
level: CommandBufferLevel,
command_buffer_count: u32,
) -> Option<IntoIter<[StandardCommandBufferBuilderAlloc; 1]>> {
let command_buffer_count = command_buffer_count as usize;
match level {
CommandBufferLevel::Primary => {
if let Some(pool) = &self.inner.primary_pool {
let count = self.inner.primary_allocations.get();
if count + command_buffer_count <= pool.capacity() {
let mut output = SmallVec::<[_; 1]>::with_capacity(command_buffer_count);
for _ in 0..command_buffer_count {
output.push(StandardCommandBufferBuilderAlloc {
inner: StandardCommandBufferAlloc {
inner: ManuallyDrop::new(pool.pop().unwrap()),
pool: self.clone(),
},
_marker: PhantomData,
});
}
self.inner
.primary_allocations
.set(count + command_buffer_count);
Some(output.into_iter())
} else if command_buffer_count > pool.capacity() {
panic!(
"command buffer count ({}) exceeds the capacity of the primary command \
buffer pool ({})",
command_buffer_count, pool.capacity(),
);
} else {
None
}
} else {
panic!(
"attempted to allocate a primary command buffer when the primary command \
buffer pool was configured to be empty",
);
}
}
CommandBufferLevel::Secondary => {
if let Some(pool) = &self.inner.secondary_pool {
let count = self.inner.secondary_allocations.get();
if count + command_buffer_count <= pool.capacity() {
let mut output = SmallVec::<[_; 1]>::with_capacity(command_buffer_count);
for _ in 0..command_buffer_count {
output.push(StandardCommandBufferBuilderAlloc {
inner: StandardCommandBufferAlloc {
inner: ManuallyDrop::new(pool.pop().unwrap()),
pool: self.clone(),
},
_marker: PhantomData,
});
}
self.inner
.secondary_allocations
.set(count + command_buffer_count);
Some(output.into_iter())
} else if command_buffer_count > pool.capacity() {
panic!(
"command buffer count ({}) exceeds the capacity of the secondary \
command buffer pool ({})",
command_buffer_count,
pool.capacity(),
);
} else {
None
}
} else {
panic!(
"attempted to allocate a secondary command buffer when the secondary \
command buffer pool was configured to be empty",
);
}
}
}
}
}
impl Drop for Pool {
fn drop(&mut self) {
let inner = unsafe { ManuallyDrop::take(&mut self.inner) };
if thread::panicking() {
return;
}
unsafe { inner.inner.reset(CommandPoolResetFlags::empty()) }.unwrap();
inner.primary_allocations.set(0);
inner.secondary_allocations.set(0);
// If there is not enough space in the reserve, we destroy the pool. The only way this can
// happen is if something is resource hogging, forcing new pools to be created such that
// the number exceeds `MAX_POOLS`, and then drops them all at once.
let _ = self.reserve.push(inner);
}
}
/// Parameters to create a new [`StandardCommandBufferAllocator`].
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct StandardCommandBufferAllocatorCreateInfo {
/// How many primary command buffers should be allocated per pool.
///
/// Each time a thread allocates using some queue family index, and either no pools were
/// initialized yet or all pools are full, a new pool is created for that thread and queue
/// family combination. This option tells the allocator how many primary command buffers should
/// be allocated for that pool. It always allocates exactly this many command buffers at once
/// for the pool, as that is more performant than allocating them one-by-one. What this means
/// is that you should make sure that this is not too large, so that you don't end up wasting
/// too much memory. You also don't want this to be too low, because that on the other hand
/// would mean that the pool would have to be reset more often, or that more pools would need
/// to be created, depending on the lifetime of the command buffers.
///
/// The default value is `32`.
pub primary_buffer_count: usize,
/// Same as `primary_buffer_count` except for secondary command buffers.
///
/// The default value is `0`.
pub secondary_buffer_count: usize,
pub _ne: crate::NonExhaustive,
}
impl Default for StandardCommandBufferAllocatorCreateInfo {
#[inline]
fn default() -> Self {
StandardCommandBufferAllocatorCreateInfo {
primary_buffer_count: 32,
secondary_buffer_count: 0,
_ne: crate::NonExhaustive(()),
}
}
}
/// Command buffer allocated from a [`StandardCommandBufferAllocator`] that is currently being
/// built.
pub struct StandardCommandBufferBuilderAlloc {
// The only difference between a `StandardCommandBufferBuilder` and a
// `StandardCommandBufferAlloc` is that the former must not implement `Send` and `Sync`.
// Therefore we just share the structs.
inner: StandardCommandBufferAlloc,
// Unimplemented `Send` and `Sync` from the builder.
_marker: PhantomData<*const ()>,
}
unsafe impl CommandBufferBuilderAlloc for StandardCommandBufferBuilderAlloc {
type Alloc = StandardCommandBufferAlloc;
#[inline]
fn inner(&self) -> &CommandPoolAlloc {
self.inner.inner()
}
#[inline]
fn into_alloc(self) -> Self::Alloc {
self.inner
}
#[inline]
fn queue_family_index(&self) -> u32 {
self.inner.queue_family_index()
}
}
unsafe impl DeviceOwned for StandardCommandBufferBuilderAlloc {
#[inline]
fn device(&self) -> &Arc<Device> {
self.inner.device()
}
}
/// Command buffer allocated from a [`StandardCommandBufferAllocator`].
pub struct StandardCommandBufferAlloc {
// The actual command buffer. Extracted in the `Drop` implementation.
inner: ManuallyDrop<CommandPoolAlloc>,
// We hold a reference to the pool for our destructor.
pool: Arc<Pool>,
}
// It's fine to share `Pool` between threads because we never access the Vulkan command pool
// concurrently. Same goes for the `Cell`s.
unsafe impl Send for StandardCommandBufferAlloc {}
unsafe impl Sync for StandardCommandBufferAlloc {}
unsafe impl CommandBufferAlloc for StandardCommandBufferAlloc {
#[inline]
fn inner(&self) -> &CommandPoolAlloc {
&self.inner
}
#[inline]
fn queue_family_index(&self) -> u32 {
self.pool.inner.inner.queue_family_index()
}
}
unsafe impl DeviceOwned for StandardCommandBufferAlloc {
#[inline]
fn device(&self) -> &Arc<Device> {
self.pool.inner.inner.device()
}
}
impl Drop for StandardCommandBufferAlloc {
#[inline]
fn drop(&mut self) {
let inner = unsafe { ManuallyDrop::take(&mut self.inner) };
let pool = match inner.level() {
CommandBufferLevel::Primary => &self.pool.inner.primary_pool,
CommandBufferLevel::Secondary => &self.pool.inner.secondary_pool,
};
// This can't panic, because if an allocation from a particular kind of pool was made, then
// the pool must exist.
let _ = pool.as_ref().unwrap().push(inner);
}
}
/// Error that can be returned when resetting a [`CommandPool`].
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum ResetCommandPoolError {
/// A runtime error occurred.
VulkanError(VulkanError),
/// The `CommandPool` is still in use.
InUse,
}
impl Error for ResetCommandPoolError {}
impl Display for ResetCommandPoolError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::VulkanError(_) => write!(f, "a runtime error occurred"),
Self::InUse => write!(f, "the command pool is still in use"),
}
}
}
impl From<VulkanError> for ResetCommandPoolError {
fn from(err: VulkanError) -> Self {
Self::VulkanError(err)
}
}
impl From<ResetCommandPoolError> for Validated<ResetCommandPoolError> {
fn from(err: ResetCommandPoolError) -> Self {
Self::Error(err)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::VulkanObject;
use std::thread;
#[test]
fn threads_use_different_pools() {
let (device, queue) = gfx_dev_and_queue!();
let allocator = StandardCommandBufferAllocator::new(device, Default::default());
let pool1 = allocator
.allocate(queue.queue_family_index(), CommandBufferLevel::Primary, 1)
.unwrap()
.next()
.unwrap()
.into_alloc()
.pool
.inner
.inner
.handle();
thread::spawn(move || {
let pool2 = allocator
.allocate(queue.queue_family_index(), CommandBufferLevel::Primary, 1)
.unwrap()
.next()
.unwrap()
.into_alloc()
.pool
.inner
.inner
.handle();
assert_ne!(pool1, pool2);
})
.join()
.unwrap();
}
}