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[client] input: abstract guest input backends

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Introduce LG_InputOps and route keyboard and mouse input through the
active video transport when it provides an input backend.

Keep SPICE as the fallback and force it while the SPICE display is
active. Add atomic shared/exclusive locking for safe backend changes.
This commit is contained in:
Geoffrey McRae
2026-08-08 21:23:32 +10:00
parent 04fd31219c
commit f495e5b7ba
17 changed files with 711 additions and 105 deletions
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44
common/include/common/locking.h
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@@ -34,6 +34,50 @@ typedef atomic_flag LG_Lock;
atomic_flag_clear_explicit(&(x), memory_order_release);
#define LG_LOCK_FREE(x)
typedef struct LG_RWLock
{
atomic_uint readers;
atomic_uint writers;
atomic_flag writer;
}
LG_RWLock;
#define LG_RWLOCK_INIT(x) do { \
atomic_init(&(x).readers, 0); \
atomic_init(&(x).writers, 0); \
atomic_flag_clear(&(x).writer); \
} while (0)
#define LG_LOCK_SHARED(x) do { \
for (;;) \
{ \
while (atomic_load_explicit( \
&(x).writers, memory_order_seq_cst)) { ; } \
atomic_fetch_add_explicit(&(x).readers, 1, memory_order_seq_cst); \
if (!atomic_load_explicit(&(x).writers, memory_order_seq_cst)) \
break; \
atomic_fetch_sub_explicit(&(x).readers, 1, memory_order_seq_cst); \
} \
} while (0)
#define LG_UNLOCK_SHARED(x) \
atomic_fetch_sub_explicit(&(x).readers, 1, memory_order_seq_cst)
#define LG_LOCK_EXCLUSIVE(x) do { \
atomic_fetch_add_explicit(&(x).writers, 1, memory_order_seq_cst); \
while (atomic_flag_test_and_set_explicit( \
&(x).writer, memory_order_seq_cst)) { ; } \
while (atomic_load_explicit( \
&(x).readers, memory_order_seq_cst)) { ; } \
} while (0)
#define LG_UNLOCK_EXCLUSIVE(x) do { \
atomic_flag_clear_explicit(&(x).writer, memory_order_seq_cst); \
atomic_fetch_sub_explicit(&(x).writers, 1, memory_order_seq_cst); \
} while (0)
#define LG_RWLOCK_FREE(x)
#define INTERLOCKED_INC(x) atomic_fetch_add((x), 1)
#define INTERLOCKED_DEC(x) atomic_fetch_sub((x), 1)