liblzma: Fix a wrong comment in stream_encoder_mt.c.

diff --git a/src/liblzma/common/stream_encoder_mt.c b/src/liblzma/common/stream_encoder_mt.c
index 6b897ab9572d5bcc790da4c89df23b95994f33ee..91cda9981a4c213f98c03140348a101fa184d4cf 100644 (file)
--- a/src/liblzma/common/stream_encoder_mt.c
+++ b/src/liblzma/common/stream_encoder_mt.c
@@ -640,9 +640,13 @@ wait_for_work(lzma_stream_coder *coder, mythread_condtime *wait_abs,
                // to true here and calculate the absolute time when
                // we must return if there's nothing to do.
                //
-               // The idea of *has_blocked is to avoid unneeded calls
-               // to mythread_condtime_set(), which may do a syscall
-               // depending on the operating system.
+               // This way if we block multiple times for short moments
+               // less than "timeout" milliseconds, we will return once
+               // "timeout" amount of time has passed since the *first*
+               // blocking occurred. If the absolute time was calculated
+               // again every time we block, "timeout" would effectively
+               // be meaningless if we never consecutively block longer
+               // than "timeout" ms.
                *has_blocked = true;
                mythread_condtime_set(wait_abs, &coder->cond, coder->timeout);
        }