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don't check if the buffer is still "present" from the user's perspective in LifetimeTracker.handle_mapping

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This change doesn't change behavior as `Global.buffer_drop` already unmaps the buffer.
This commit is contained in:
teoxoy 2024-07-04 17:50:31 +02:00 committed by Teodor Tanasoaia
parent 3cc6c2743a
commit 3fba403060
2 changed files with 52 additions and 63 deletions
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112
wgpu-core/src/device/life.rs
View File

@ -710,7 +710,6 @@ impl<A: HalApi> LifetimeTracker<A> {
pub(crate) fn handle_mapping(
&mut self,
raw: &A::Device,
trackers: &Mutex<Tracker<A>>,
snatch_guard: &SnatchGuard,
) -> Vec<super::BufferMapPendingClosure> {
if self.ready_to_map.is_empty() {
@ -721,69 +720,60 @@ impl<A: HalApi> LifetimeTracker<A> {
for buffer in self.ready_to_map.drain(..) {
let tracker_index = buffer.tracker_index();
let is_removed = {
let mut trackers = trackers.lock();
trackers.buffers.remove_abandoned(tracker_index)
// This _cannot_ be inlined into the match. If it is, the lock will be held
// open through the whole match, resulting in a deadlock when we try to re-lock
// the buffer back to active.
let mapping = std::mem::replace(
&mut *buffer.map_state.lock(),
resource::BufferMapState::Idle,
);
let pending_mapping = match mapping {
resource::BufferMapState::Waiting(pending_mapping) => pending_mapping,
// Mapping cancelled
resource::BufferMapState::Idle => continue,
// Mapping queued at least twice by map -> unmap -> map
// and was already successfully mapped below
resource::BufferMapState::Active { .. } => {
*buffer.map_state.lock() = mapping;
continue;
}
_ => panic!("No pending mapping."),
};
if is_removed {
*buffer.map_state.lock() = resource::BufferMapState::Idle;
log::trace!("Buffer ready to map {tracker_index:?} is not tracked anymore");
let status = if pending_mapping.range.start != pending_mapping.range.end {
log::debug!("Buffer {tracker_index:?} map state -> Active");
let host = pending_mapping.op.host;
let size = pending_mapping.range.end - pending_mapping.range.start;
match super::map_buffer(
raw,
&buffer,
pending_mapping.range.start,
size,
host,
snatch_guard,
) {
Ok(ptr) => {
*buffer.map_state.lock() = resource::BufferMapState::Active {
ptr,
range: pending_mapping.range.start..pending_mapping.range.start + size,
host,
};
Ok(())
}
Err(e) => {
log::error!("Mapping failed: {e}");
Err(e)
}
}
} else {
// This _cannot_ be inlined into the match. If it is, the lock will be held
// open through the whole match, resulting in a deadlock when we try to re-lock
// the buffer back to active.
let mapping = std::mem::replace(
&mut *buffer.map_state.lock(),
resource::BufferMapState::Idle,
);
let pending_mapping = match mapping {
resource::BufferMapState::Waiting(pending_mapping) => pending_mapping,
// Mapping cancelled
resource::BufferMapState::Idle => continue,
// Mapping queued at least twice by map -> unmap -> map
// and was already successfully mapped below
resource::BufferMapState::Active { .. } => {
*buffer.map_state.lock() = mapping;
continue;
}
_ => panic!("No pending mapping."),
*buffer.map_state.lock() = resource::BufferMapState::Active {
ptr: std::ptr::NonNull::dangling(),
range: pending_mapping.range,
host: pending_mapping.op.host,
};
let status = if pending_mapping.range.start != pending_mapping.range.end {
log::debug!("Buffer {tracker_index:?} map state -> Active");
let host = pending_mapping.op.host;
let size = pending_mapping.range.end - pending_mapping.range.start;
match super::map_buffer(
raw,
&buffer,
pending_mapping.range.start,
size,
host,
snatch_guard,
) {
Ok(ptr) => {
*buffer.map_state.lock() = resource::BufferMapState::Active {
ptr,
range: pending_mapping.range.start
..pending_mapping.range.start + size,
host,
};
Ok(())
}
Err(e) => {
log::error!("Mapping failed: {e}");
Err(e)
}
}
} else {
*buffer.map_state.lock() = resource::BufferMapState::Active {
ptr: std::ptr::NonNull::dangling(),
range: pending_mapping.range,
host: pending_mapping.op.host,
};
Ok(())
};
pending_callbacks.push((pending_mapping.op, status));
}
Ok(())
};
pending_callbacks.push((pending_mapping.op, status));
}
pending_callbacks
}

3
wgpu-core/src/device/resource.rs
View File

@ -430,8 +430,7 @@ impl<A: HalApi> Device<A> {
life_tracker.triage_mapped();
let mapping_closures =
life_tracker.handle_mapping(self.raw(), &self.trackers, &snatch_guard);
let mapping_closures = life_tracker.handle_mapping(self.raw(), &snatch_guard);
let queue_empty = life_tracker.queue_empty();