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liblzma: Threaded decoder: Stop the worker threads on errors.

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It's waste of CPU time and electricity to leave the unfinished
worker threads running when it is known that their output will
get ignored.
This commit is contained in:
Lasse Collin 2022-10-24 16:25:09 +03:00
parent 2611c4d905
commit fda9f85f52
1 changed files with 26 additions and 7 deletions
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33
src/liblzma/common/stream_decoder_mt.c
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@ -1169,9 +1169,16 @@ stream_decode_mt(void *coder_ptr, const lzma_allocator *allocator,
// The downside of this is that with fail-fast apps
// cannot always distinguish between corrupt and
// truncated files.
if (action == LZMA_FINISH && coder->fail_fast)
if (action == LZMA_FINISH && coder->fail_fast) {
// We won't produce any more output. Stop
// the unfinished worker threads so they
// won't waste CPU time.
threads_stop(coder);
return LZMA_DATA_ERROR;
}
// read_output_and_wait() will call threads_stop()
// if needed so with that we can use return_if_error.
return_if_error(read_output_and_wait(coder, allocator,
out, out_pos, out_size,
NULL, waiting_allowed,
@ -1447,12 +1454,20 @@ stream_decode_mt(void *coder_ptr, const lzma_allocator *allocator,
}
// Allocate memory for the output buffer in the output queue.
return_if_error(lzma_outq_prealloc_buf(
lzma_ret ret = lzma_outq_prealloc_buf(
&coder->outq, allocator,
coder->block_options.uncompressed_size));
coder->block_options.uncompressed_size);
if (ret != LZMA_OK) {
threads_stop(coder);
return ret;
}
// Set up coder->thr.
return_if_error(get_thread(coder, allocator));
ret = get_thread(coder, allocator);
if (ret != LZMA_OK) {
threads_stop(coder);
return ret;
}
// The new Block decoder memory usage is already counted in
// coder->mem_in_use. Store it in the thread too.
@ -1460,7 +1475,7 @@ stream_decode_mt(void *coder_ptr, const lzma_allocator *allocator,
// Initialize the Block decoder.
coder->thr->block_options = coder->block_options;
const lzma_ret ret = lzma_block_decoder_init(
ret = lzma_block_decoder_init(
&coder->thr->block_decoder, allocator,
&coder->thr->block_options);
@ -1480,8 +1495,10 @@ stream_decode_mt(void *coder_ptr, const lzma_allocator *allocator,
// Allocate the input buffer.
coder->thr->in_size = coder->mem_next_in;
coder->thr->in = lzma_alloc(coder->thr->in_size, allocator);
if (coder->thr->in == NULL)
if (coder->thr->in == NULL) {
threads_stop(coder);
return LZMA_MEM_ERROR;
}
// Get the preallocated output buffer.
coder->thr->outbuf = lzma_outq_get_buf(
@ -1516,8 +1533,10 @@ stream_decode_mt(void *coder_ptr, const lzma_allocator *allocator,
const size_t in_avail = in_size - *in_pos;
const size_t in_needed = coder->thr->in_size
- coder->thr->in_filled;
if (in_avail < in_needed)
if (in_avail < in_needed) {
threads_stop(coder);
return LZMA_DATA_ERROR;
}
}
// Copy input to the worker thread.