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avcodec/refstruct: Allow to always return zeroed pool entries 

This is in preparation for the following commit.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-08-06 13:04:10 +02:00
parent e01e30ede1
commit 090d9956fd
2 changed files with 18 additions and 0 deletions
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10
libavcodec/refstruct.c
View File

@ -285,6 +285,10 @@ static int refstruct_pool_get_ext(void *datap, FFRefStructPool *pool)
}
}
atomic_fetch_add_explicit(&pool->refcount, 1, memory_order_relaxed);
if (pool->pool_flags & FF_REFSTRUCT_POOL_FLAG_ZERO_EVERY_TIME)
memset(ret, 0, pool->size);
memcpy(datap, &ret, sizeof(ret));
return 0;
@ -357,6 +361,12 @@ FFRefStructPool *ff_refstruct_pool_alloc_ext_c(size_t size, unsigned flags,
flags &= ~FF_REFSTRUCT_POOL_FLAG_FREE_ON_INIT_ERROR;
pool->pool_flags = flags;
if (flags & FF_REFSTRUCT_POOL_FLAG_ZERO_EVERY_TIME) {
// We will zero the buffer before every use, so zeroing
// upon allocating the buffer is unnecessary.
pool->entry_flags |= FF_REFSTRUCT_FLAG_NO_ZEROING;
}
atomic_init(&pool->refcount, 1);
err = ff_mutex_init(&pool->mutex, NULL);

8
libavcodec/refstruct.h
View File

@ -211,6 +211,14 @@ typedef struct FFRefStructPool FFRefStructPool;
* the callbacks applied earlier (init_cb potentially followed by reset_cb).
*/
#define FF_REFSTRUCT_POOL_FLAG_FREE_ON_INIT_ERROR (1 << 17)
/**
* If this flag is set, the entries will be zeroed before
* being returned to the user (after the init or reset callbacks
* have been called (if provided)). Furthermore, to avoid zeroing twice
* it also makes the pool behave as if the FF_REFSTRUCT_POOL_FLAG_NO_ZEROING
* flag had been provided.
*/
#define FF_REFSTRUCT_POOL_FLAG_ZERO_EVERY_TIME (1 << 18)
/**
* Equivalent to ff_refstruct_pool_alloc(size, flags, NULL, NULL, NULL, NULL, NULL)