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vkd3d: Lower contention when spinlocking writers. 

Signed-off-by: Hans-Kristian Arntzen <post@arntzen-software.no>
This commit is contained in:
Hans-Kristian Arntzen 2020-12-02 12:57:58 +01:00
parent b85a345d48
commit adf0be5bf1
1 changed files with 4 additions and 3 deletions
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7
include/private/vkd3d_rw_spinlock.h
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@ -44,9 +44,10 @@ static inline void rw_spinlock_release_read(spinlock_t *spinlock)
static inline void rw_spinlock_acquire_write(spinlock_t *spinlock)
{
while (vkd3d_atomic_uint32_compare_exchange(spinlock,
VKD3D_RW_SPINLOCK_IDLE, VKD3D_RW_SPINLOCK_WRITE,
vkd3d_memory_order_acquire, vkd3d_memory_order_relaxed) != VKD3D_RW_SPINLOCK_IDLE)
while (vkd3d_atomic_uint32_load_explicit(spinlock, vkd3d_memory_order_relaxed) != VKD3D_RW_SPINLOCK_IDLE ||
vkd3d_atomic_uint32_compare_exchange(spinlock,
VKD3D_RW_SPINLOCK_IDLE, VKD3D_RW_SPINLOCK_WRITE,
vkd3d_memory_order_acquire, vkd3d_memory_order_relaxed) != VKD3D_RW_SPINLOCK_IDLE)
{
#ifdef __SSE2__
_mm_pause();