FFmpeg

642MB

Tree: d16079abf4

Author	SHA1	Message	Date
wm4	fbd6c97f9c	lavu: fix memory leaks by using a mutex instead of atomics The buffer pool has to atomically add and remove entries from the linked list of available buffers. This was done by removing the entire list with a CAS operation, working on it, and then setting it back again (using a retry-loop in case another thread was doing the same thing). This could effectively cause memory leaks: while a thread was working on the buffer list, other threads would allocate new buffers, increasing the pool's total size. There was no real leak, but since these extra buffers were not needed, but not free'd either (except when the buffer pool was destroyed), this had the same effects as a real leak. For some reason, growth was exponential, and could easily kill the process due to OOM in real-world uses. Fix this by using a mutex to protect the list operations. The fancy way atomics remove the whole list to work on it is not needed anymore, which also avoids the situation which was causing the leak. Signed-off-by: Anton Khirnov <anton@khirnov.net>	10 years ago
Michael Niedermayer	cea3a63ba3	avutil/buffer: Fix race in pool. This race will always happen sooner or later in a multi-threaded environment and it will over time lead to OOM. This fix works by spinning, there are other ways by which this can be fixed, like simply detecting the issue after it happened and freeing the over-allocated memory or simply using a mutex. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	12 years ago
Anton Khirnov	1cec0624d0	AVBuffer: add a new API for buffer pools	12 years ago
Anton Khirnov	8e401dbe90	lavu: add a new API for reference-counted data buffers.	12 years ago

7 Commits (d16079abf473b51be7686d20f8014bb48a095722)