Mipmap peak building actually happens in the UI thread, not the IO thread.

Therefore, it is always necessary to fork when mipmapping peaks after capture.

Timeline/Engine/Audio_Region.C

@@ -209,7 +209,6 @@ Audio_Region::write ( nframes_t nframes )
     return nframes;
 }
 
-/* THREAD: IO */
 /** finalize region capture. Assumes that this *is* a captured region
  and that no other regions refer to the same source */
 bool

Timeline/Engine/Disk_Stream.C

@@ -135,6 +135,7 @@ Disk_Stream::shutdown ( void )
         pthread_join( _thread, NULL );
 
     _thread = 0;
+
     _terminate = false;
 }
 

Timeline/Engine/Peaks.C

@@ -530,7 +530,6 @@ Peaks::prepare_for_writing ( void )
     _peak_writer = new Peaks::Streamer( _clip->name(), _clip->channels(), cache_minimum );
 }
 
-/* THREAD: IO */
 void
 Peaks::finish_writing ( void )
 {
@@ -539,10 +538,9 @@ Peaks::finish_writing ( void )
     delete _peak_writer;
     _peak_writer = NULL;
 
-    /* now fill in the rest of the cache */
-    make_peaks_mipmap();
-/*     if ( ! fork() ) */
-/*         exit( make_peaks_mipmap() ); */
+/*     now fill in the rest of the cache */
+    if ( ! fork() )
+        exit( make_peaks_mipmap() );
 
 }
 

Timeline/Engine/Record_DS.C

@@ -145,12 +145,11 @@ Record_DS::disk_thread ( void )
         const nframes_t nframes = _nframes;
         const size_t block_size = _nframes * sizeof( sample_t );
 
-
 #ifdef AVOID_UNNECESSARY_COPYING
         sample_t *cbuf = new sample_t[ nframes ];
 #endif
 
-        while ( blocks_ready-- > 0 || ! sem_trywait( &_blocks ) && errno != EAGAIN )
+        while ( blocks_ready-- > 0 || ( ! sem_trywait( &_blocks ) && errno != EAGAIN ) )
         {
 
                 for ( int i = channels(); i--; )
@@ -182,8 +181,6 @@ Record_DS::disk_thread ( void )
 #ifndef AVOID_UNNECESSARY_COPYING
     delete[] cbuf;
 #endif
-
-    _thread = NULL;
 }
 
 
@@ -217,21 +214,16 @@ Record_DS::stop ( nframes_t frame )
 {
     if ( ! _recording )
     {
-        printf( "programming error: attempt to stop recording when no recording is being made\n" );
+        WARNING( "programming error: attempt to stop recording when no recording is being made\n" );
         return;
     }
 
     _recording = false;
 
-    /* FIXME: we may still have data in the buffers waiting to be
-     * written to disk... We should flush it out before stopping... */
-
     _stop_frame = frame;
 
     shutdown();
 
-    /* FIXME: flush buffers here? */
-
     track()->stop( frame );
 
     DMESSAGE( "recording finished" );