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fdmemory: add flag to avoid close of the fd

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Add GST_FD_MEMORY_FLAG_DONT_CLOSE to avoid closing the fd when the
memory is freed. When you can guarantee the lifetime of the fd is
longer than the memory, this can save a dup() call.
This commit is contained in:
Wim Taymans 2016-08-19 09:27:01 +02:00
parent 70149451ea
commit 38622ee1e8
2 changed files with 7 additions and 2 deletions
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6
gst-libs/gst/allocators/gstfdmemory.c
View file

@ -65,7 +65,8 @@ gst_fd_mem_free (GstAllocator * allocator, GstMemory * gmem)
munmap ((void *) mem->data, gmem->maxsize);
}
if (mem->fd >= 0 && gmem->parent == NULL)
if (mem->fd >= 0 && gmem->parent == NULL
&& !(mem->flags & GST_FD_MEMORY_FLAG_DONT_CLOSE))
close (mem->fd);
g_mutex_clear (&mem->lock);
g_slice_free (GstFdMemory, mem);
@ -245,7 +246,8 @@ gst_fd_allocator_new (void)
* Return a %GstMemory that wraps a generic file descriptor.
*
* Returns: (transfer full): a GstMemory based on @allocator.
* When the buffer will be released the allocator will close the @fd.
* When the buffer will be released the allocator will close the @fd unless
* the %GST_FD_MEMORY_FLAG_DONT_CLOSE flag is specified.
* The memory is only mmapped on gst_buffer_mmap() request.
*
* Since: 1.6

3
gst-libs/gst/allocators/gstfdmemory.h
View file

@ -45,6 +45,8 @@ typedef struct _GstFdAllocatorClass GstFdAllocatorClass;
* keep it mapped until the memory is destroyed.
* @GST_FD_MEMORY_FLAG_MAP_PRIVATE: do a private mapping instead of
* the default shared mapping.
* @GST_FD_MEMORY_FLAG_DONT_CLOSE: don't close the file descriptor when
* the memory is freed. Since: 1.10.
*
* Various flags to control the operation of the fd backed memory.
*
@ -54,6 +56,7 @@ typedef enum {
GST_FD_MEMORY_FLAG_NONE = 0,
GST_FD_MEMORY_FLAG_KEEP_MAPPED = (1 << 0),
GST_FD_MEMORY_FLAG_MAP_PRIVATE = (1 << 1),
GST_FD_MEMORY_FLAG_DONT_CLOSE = (1 << 2),
} GstFdMemoryFlags;
/**