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vulkan: remove pointless mutex locks

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This code was simply incorrect through and through. It did not
protect what actually has to be protected in a multi-threaded setup.
Perhaps it was used to silence threading errors?

Either way, remove it, and document the correct way to use execution
pools in a threaded environment.
This commit is contained in:
Lynne 2024-12-18 14:58:33 +09:00
parent 7239be07be
commit 157cd820ad
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GPG Key ID: A2FEA5F03F034464
2 changed files with 2 additions and 12 deletions
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12
libavutil/vulkan.c
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@ -251,7 +251,6 @@ void ff_vk_exec_pool_free(FFVulkanContext *s, FFVkExecPool *pool)
vk->WaitForFences(s->hwctx->act_dev, 1, &e->fence, VK_TRUE, UINT64_MAX);
vk->DestroyFence(s->hwctx->act_dev, e->fence, s->hwctx->alloc);
}
pthread_mutex_destroy(&e->lock);
ff_vk_exec_discard_deps(s, e);
@ -424,11 +423,6 @@ int ff_vk_exec_pool_init(FFVulkanContext *s, FFVkQueueFamilyCtx *qf,
.flags = VK_FENCE_CREATE_SIGNALED_BIT,
};
/* Mutex */
err = pthread_mutex_init(&e->lock, NULL);
if (err != 0)
return AVERROR(err);
/* Fence */
ret = vk->CreateFence(s->hwctx->act_dev, &fence_create, s->hwctx->alloc,
&e->fence);
@ -498,10 +492,8 @@ FFVkExecContext *ff_vk_exec_get(FFVulkanContext *s, FFVkExecPool *pool)
void ff_vk_exec_wait(FFVulkanContext *s, FFVkExecContext *e)
{
FFVulkanFunctions *vk = &s->vkfn;
pthread_mutex_lock(&e->lock);
vk->WaitForFences(s->hwctx->act_dev, 1, &e->fence, VK_TRUE, UINT64_MAX);
ff_vk_exec_discard_deps(s, e);
pthread_mutex_unlock(&e->lock);
}
int ff_vk_exec_start(FFVulkanContext *s, FFVkExecContext *e)
@ -517,11 +509,7 @@ int ff_vk_exec_start(FFVulkanContext *s, FFVkExecContext *e)
/* Wait for the fence to be signalled */
vk->WaitForFences(s->hwctx->act_dev, 1, &e->fence, VK_TRUE, UINT64_MAX);
/* vkResetFences is defined as being host-synchronized */
pthread_mutex_lock(&e->lock);
vk->ResetFences(s->hwctx->act_dev, 1, &e->fence);
pthread_mutex_unlock(&e->lock);
/* Discard queue dependencies */
ff_vk_exec_discard_deps(s, e);

2
libavutil/vulkan.h
View File

@ -400,6 +400,8 @@ int ff_vk_qf_init(FFVulkanContext *s, FFVkQueueFamilyCtx *qf,
/**
* Allocates/frees an execution pool.
* If used in a multi-threaded context, there must be at least as many contexts
* as there are threads.
* ff_vk_exec_pool_init_desc() MUST be called if ff_vk_exec_descriptor_set_add()
* has been called.
*/