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transactions: Amend pending transactions

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The transaction system contains a necessary optimization where a popped
transaction is combined with later, similar transactions. This breaks
the chronological order of states, and can lead to desynchronized
geometries.

To fix this, we replace the queue with only 2 transactions: current and
pending. If a pending transaction exists, it is updated with new state
instead of creating additional transactions.

As we never have more than a single waiting transaction, we no longer
need the queue optimization that is causing problems.

Closes: https://github.com/swaywm/sway/issues/6012
This commit is contained in:
Kenny Levinsen 2021-02-12 21:27:28 +01:00 • committed by Simon Ser
parent b944735b47
commit c8bf84c82d
3 changed files with 93 additions and 85 deletions
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18
include/sway/server.h
View file

@ -23,6 +23,8 @@
#include "sway/xwayland.h"
#endif
struct sway_transaction;
struct sway_server {
struct wl_display *wl_display;
struct wl_event_loop *wl_event_loop;
@ -85,8 +87,22 @@ struct sway_server {
struct wlr_text_input_manager_v3 *text_input;
struct wlr_foreign_toplevel_manager_v1 *foreign_toplevel_manager;
// The timeout for transactions, after which a transaction is applied
// regardless of readiness.
size_t txn_timeout_ms;
list_t *transactions;
// Stores a transaction after it has been committed, but is waiting for
// views to ack the new dimensions before being applied. A queued
// transaction is frozen and must not have new instructions added to it.
struct sway_transaction *queued_transaction;
// Stores a pending transaction that will be committed once the existing
// queued transaction is applied and freed. The pending transaction can be
// updated with new instructions as needed.
struct sway_transaction *pending_transaction;
// Stores the nodes that have been marked as "dirty" and will be put into
// the pending transaction.
list_t *dirty_nodes;
};