Commit db853b7a authored by Kim F. Storm's avatar Kim F. Storm

Improve commentary for adaptive read buffering.

parent 8b793bed
......@@ -272,17 +272,19 @@ int update_tick;
#define READ_OUTPUT_DELAY_MAX (READ_OUTPUT_DELAY_INCREMENT * 5)
#define READ_OUTPUT_DELAY_MAX_MAX (READ_OUTPUT_DELAY_INCREMENT * 7)
/* Number of processes which might be delayed. */
/* Number of processes which have a non-zero read_output_delay,
and therefore might be delayed for adaptive read buffering. */
static int process_output_delay_count;
/* Non-zero if any process has non-nil process_output_skip. */
/* Non-zero if any process has non-nil read_output_skip. */
static int process_output_skip;
/* Non-nil means to delay reading process output to improve buffering.
A value of t means that delay is reset after each send, any other
non-nil value does not reset the delay. */
non-nil value does not reset the delay. A value of nil disables
adaptive read buffering completely. */
static Lisp_Object Vprocess_adaptive_read_buffering;
#else
#define process_output_delay_count 0
......@@ -4319,6 +4321,11 @@ wait_reading_process_output (time_limit, microsecs, read_kbd, do_display,
#endif
#ifdef ADAPTIVE_READ_BUFFERING
/* Set the timeout for adaptive read buffering if any
process has non-nil read_output_skip and non-zero
read_output_delay, and we are not reading output for a
specific wait_channel. It is not executed if
Vprocess_adaptive_read_buffering is nil. */
if (process_output_skip && check_delay > 0)
{
int usecs = EMACS_USECS (timeout);
......@@ -4329,6 +4336,8 @@ wait_reading_process_output (time_limit, microsecs, read_kbd, do_display,
proc = chan_process[channel];
if (NILP (proc))
continue;
/* Find minimum non-zero read_output_delay among the
processes with non-nil read_output_skip. */
if (XINT (XPROCESS (proc)->read_output_delay) > 0)
{
check_delay--;
......@@ -6711,7 +6720,7 @@ init_process ()
#endif /* HAVE_SOCKETS */
#if defined (DARWIN) || defined (MAC_OSX)
/* PTYs are broken on Darwin < 6, but are sometimes useful for interactive
/* PTYs are broken on Darwin < 6, but are sometimes useful for interactive
processes. As such, we only change the default value. */
if (initialized)
{
......
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