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avcodec/refstruct: Allow to share pools 

To do this, make FFRefStructPool itself refcounted according
to the RefStruct API.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-08-16 14:04:27 +02:00
parent 92abc7266b
commit 0c44f63b02
2 changed files with 25 additions and 14 deletions
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34
libavcodec/refstruct.c
View File

@ -210,7 +210,7 @@ static void pool_free(FFRefStructPool *pool)
ff_mutex_destroy(&pool->mutex);
if (pool->free_cb)
pool->free_cb(pool->opaque);
av_free(pool);
av_free(get_refcount(pool));
}
static void pool_free_entry(FFRefStructPool *pool, RefCount *ref)
@ -301,13 +301,22 @@ void *ff_refstruct_pool_get(FFRefStructPool *pool)
return ret;
}
void ff_refstruct_pool_uninit(FFRefStructPool **poolp)
/**
* Hint: The content of pool_unref() and refstruct_pool_uninit()
* could currently be merged; they are only separate functions
* in case we would ever introduce weak references.
*/
static void pool_unref(void *ref)
{
FFRefStructPool *pool = *poolp;
RefCount *entry;
FFRefStructPool *pool = get_userdata(ref);
if (atomic_fetch_sub_explicit(&pool->refcount, 1, memory_order_acq_rel) == 1)
pool_free(pool);
}
if (!pool)
return;
static void refstruct_pool_uninit(FFRefStructOpaque unused, void *obj)
{
FFRefStructPool *pool = obj;
RefCount *entry;
ff_mutex_lock(&pool->mutex);
ff_assert(!pool->uninited);
@ -321,11 +330,6 @@ void ff_refstruct_pool_uninit(FFRefStructPool **poolp)
pool_free_entry(pool, entry);
entry = next;
}
if (atomic_fetch_sub_explicit(&pool->refcount, 1, memory_order_acq_rel) == 1)
pool_free(pool);
*poolp = NULL;
}
FFRefStructPool *ff_refstruct_pool_alloc(size_t size, unsigned flags)
@ -340,11 +344,13 @@ FFRefStructPool *ff_refstruct_pool_alloc_ext_c(size_t size, unsigned flags,
void (*free_entry_cb)(FFRefStructOpaque opaque, void *obj),
void (*free_cb)(FFRefStructOpaque opaque))
{
FFRefStructPool *pool = av_mallocz(sizeof(*pool));
FFRefStructPool *pool = ff_refstruct_alloc_ext(sizeof(*pool), 0, NULL,
refstruct_pool_uninit);
int err;
if (!pool)
return NULL;
get_refcount(pool)->free = pool_unref;
pool->size = size;
pool->opaque = opaque;
@ -371,7 +377,9 @@ FFRefStructPool *ff_refstruct_pool_alloc_ext_c(size_t size, unsigned flags,
err = ff_mutex_init(&pool->mutex, NULL);
if (err) {
av_free(pool);
// Don't call ff_refstruct_uninit() on pool, as it hasn't been properly
// set up and is just a POD right now.
av_free(get_refcount(pool));
return NULL;
}
return pool;

5
libavcodec/refstruct.h
View File

@ -289,6 +289,9 @@ void *ff_refstruct_pool_get(FFRefStructPool *pool);
* @param poolp pointer to a pointer to either NULL or a pool to be freed.
* `*poolp` will be set to NULL.
*/
void ff_refstruct_pool_uninit(FFRefStructPool **poolp);
static inline void ff_refstruct_pool_uninit(FFRefStructPool **poolp)
{
ff_refstruct_unref(poolp);
}
#endif /* AVCODEC_REFSTRUCT_H */