[FFmpeg-cvslog] threads: limit the number of automatic threads to MAX_AUTO_THREADS

[Janne Grunau]

ffmpeg | branch: master | Janne Grunau <janne-libav at jannau.net> | Sun Jan  1 17:35:16 2012 +0100| [b12d21733975f9001eecb480fc28e5e4473b1327] | committer: Janne Grunau

threads: limit the number of automatic threads to MAX_AUTO_THREADS

The extra thread added in {frame_}*thread_init was not taken into
account. Explicitly sets thread_count to 1 if only one CPU core was
detected. Also fixes two typos in comments.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b12d21733975f9001eecb480fc28e5e4473b1327
---

 libavcodec/pthread.c |   14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/libavcodec/pthread.c b/libavcodec/pthread.c
index 54a0eb3..58c5fcd 100644
--- a/libavcodec/pthread.c
+++ b/libavcodec/pthread.c
@@ -186,7 +186,7 @@ static int get_logical_cpus(AVCodecContext *avctx)
     nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
 #endif
     av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
-    return FFMIN(nb_cpus, MAX_AUTO_THREADS);
+    return nb_cpus;
 }
 
 
@@ -296,9 +296,11 @@ static int thread_init(AVCodecContext *avctx)
 
     if (!thread_count) {
         int nb_cpus = get_logical_cpus(avctx);
-        // use number of cores + 1 as thread count if there is motre than one
+        // use number of cores + 1 as thread count if there is more than one
         if (nb_cpus > 1)
-            thread_count = avctx->thread_count = nb_cpus + 1;
+            thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
+        else
+            thread_count = avctx->thread_count = 1;
     }
 
     if (thread_count <= 1) {
@@ -767,9 +769,11 @@ static int frame_thread_init(AVCodecContext *avctx)
 
     if (!thread_count) {
         int nb_cpus = get_logical_cpus(avctx);
-        // use number of cores + 1 as thread count if there is motre than one
+        // use number of cores + 1 as thread count if there is more than one
         if (nb_cpus > 1)
-            thread_count = avctx->thread_count = nb_cpus + 1;
+            thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
+        else
+            thread_count = avctx->thread_count = 1;
     }
 
     if (thread_count <= 1) {