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buffer: locking memory exclusively may fail

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Attempt to return a copy of the memory instead.

https://bugzilla.gnome.org/show_bug.cgi?id=750172
This commit is contained in:
Matthew Waters 2015-06-02 00:23:37 +10:00
parent ad4569c893
commit eb71ee4040
2 changed files with 54 additions and 16 deletions
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66
gst/gstbuffer.c
View file

@ -284,13 +284,40 @@ _replace_memory (GstBuffer * buffer, guint len, guint idx, guint length,
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
}
/* transfer full for return and transfer none for @mem */
static inline GstMemory *
_memory_get_exclusive_reference (GstMemory * mem)
{
GstMemory *ret = NULL;
if (gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE)) {
ret = gst_memory_ref (mem);
} else {
/* we cannot take another exclusive lock as the memory is already
* locked WRITE + EXCLUSIVE according to part-miniobject.txt */
ret = gst_memory_copy (mem, 0, -1);
if (ret) {
if (!gst_memory_lock (ret, GST_LOCK_FLAG_EXCLUSIVE)) {
gst_memory_unref (ret);
ret = NULL;
}
}
}
if (!ret)
GST_CAT_WARNING (GST_CAT_BUFFER, "Failed to acquire an exclusive lock for "
"memory %p", mem);
return ret;
}
static inline void
_memory_add (GstBuffer * buffer, gint idx, GstMemory * mem, gboolean lock)
_memory_add (GstBuffer * buffer, gint idx, GstMemory * mem)
{
guint i, len = GST_BUFFER_MEM_LEN (buffer);
GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %d, mem %p, lock %d", buffer,
idx, mem, lock);
GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %d, mem %p", buffer, idx, mem);
if (G_UNLIKELY (len >= GST_BUFFER_MEM_MAX)) {
/* too many buffer, span them. */
@ -312,8 +339,6 @@ _memory_add (GstBuffer * buffer, gint idx, GstMemory * mem, gboolean lock)
GST_BUFFER_MEM_PTR (buffer, i) = GST_BUFFER_MEM_PTR (buffer, i - 1);
}
/* and insert the new buffer */
if (lock)
gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE);
GST_BUFFER_MEM_PTR (buffer, idx) = mem;
GST_BUFFER_MEM_LEN (buffer) = len + 1;
@ -451,17 +476,22 @@ gst_buffer_copy_into (GstBuffer * dest, GstBuffer * src,
if (tocopy < bsize && !deep && !GST_MEMORY_IS_NO_SHARE (mem)) {
/* we need to clip something */
newmem = gst_memory_share (mem, skip, tocopy);
if (newmem)
if (newmem) {
gst_memory_lock (newmem, GST_LOCK_FLAG_EXCLUSIVE);
skip = 0;
}
}
if (deep || GST_MEMORY_IS_NO_SHARE (mem) || (!newmem && tocopy < bsize)) {
/* deep copy or we're not allowed to share this memory
* between buffers, always copy then */
newmem = gst_memory_copy (mem, skip, tocopy);
skip = 0;
if (newmem) {
gst_memory_lock (newmem, GST_LOCK_FLAG_EXCLUSIVE);
skip = 0;
}
} else if (!newmem) {
newmem = gst_memory_ref (mem);
newmem = _memory_get_exclusive_reference (mem);
}
if (!newmem) {
@ -469,7 +499,7 @@ gst_buffer_copy_into (GstBuffer * dest, GstBuffer * src,
return FALSE;
}
_memory_add (dest, -1, newmem, TRUE);
_memory_add (dest, -1, newmem);
left -= tocopy;
}
}
@ -709,8 +739,10 @@ gst_buffer_new_allocate (GstAllocator * allocator, gsize size,
newbuf = gst_buffer_new ();
if (mem != NULL)
_memory_add (newbuf, -1, mem, TRUE);
if (mem != NULL) {
gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE);
_memory_add (newbuf, -1, mem);
}
GST_CAT_LOG (GST_CAT_BUFFER,
"new buffer %p of size %" G_GSIZE_FORMAT " from allocator %p", newbuf,
@ -804,7 +836,8 @@ gst_buffer_new_wrapped_full (GstMemoryFlags flags, gpointer data,
mem =
gst_memory_new_wrapped (flags, data, maxsize, offset, size, user_data,
notify);
_memory_add (newbuf, -1, mem, TRUE);
gst_memory_lock (mem, GST_LOCK_FLAG_EXCLUSIVE);
_memory_add (newbuf, -1, mem);
GST_BUFFER_FLAG_UNSET (newbuf, GST_BUFFER_FLAG_TAG_MEMORY);
return newbuf;
@ -895,13 +928,18 @@ gst_buffer_append_memory (GstBuffer * buffer, GstMemory * mem)
void
gst_buffer_insert_memory (GstBuffer * buffer, gint idx, GstMemory * mem)
{
GstMemory *tmp;
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (gst_buffer_is_writable (buffer));
g_return_if_fail (mem != NULL);
g_return_if_fail (idx == -1 ||
(idx >= 0 && idx <= GST_BUFFER_MEM_LEN (buffer)));
_memory_add (buffer, idx, mem, TRUE);
tmp = _memory_get_exclusive_reference (mem);
g_return_if_fail (tmp != NULL);
gst_memory_unref (mem);
_memory_add (buffer, idx, tmp);
}
static GstMemory *
@ -1951,7 +1989,7 @@ gst_buffer_append_region (GstBuffer * buf1, GstBuffer * buf2, gssize offset,
mem = GST_BUFFER_MEM_PTR (buf2, i);
GST_BUFFER_MEM_PTR (buf2, i) = NULL;
_memory_add (buf1, -1, mem, FALSE);
_memory_add (buf1, -1, mem);
}
GST_BUFFER_MEM_LEN (buf2) = 0;

4
tests/check/gst/gstbuffer.c
View file

@ -381,12 +381,12 @@ GST_START_TEST (test_copy)
/* copy should still be independent if copied when mapped */
buffer = gst_buffer_new_and_alloc (4);
gst_buffer_memset (buffer, 0, 0, 4);
gst_buffer_map (buffer, &info, GST_MAP_WRITE);
fail_unless (gst_buffer_map (buffer, &info, GST_MAP_WRITE));
copy = gst_buffer_copy (buffer);
fail_unless (gst_buffer_is_writable (copy));
gst_buffer_memset (copy, 0, 0x80, 4);
gst_buffer_unmap (buffer, &info);
gst_buffer_map (buffer, &info, GST_MAP_READ);
fail_unless (gst_buffer_map (buffer, &info, GST_MAP_READ));
fail_if (gst_buffer_memcmp (copy, 0, info.data, info.size) == 0);
gst_buffer_unmap (buffer, &info);