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Work to reduce the interrupts-off duration when running in DOS.

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* ser-go32.c:  (dos_async_ready): See if anything is in the buffer.
	(dos_async_rx): rewrite to unpack as many characters from the
	asynctsr as possible into a local buffer.
This commit is contained in:
Steve Chamberlain 1994-08-22 17:58:47 +00:00
parent e914ed5219
commit be5e6fff5a
2 changed files with 79 additions and 17 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
Mon Aug 22 10:42:15 1994 Steve Chamberlain (sac@jonny.cygnus.com)
Work to reduce the interrupts-off duration when running in DOS.
* ser-go32.c: (dos_async_ready): See if anything is in the buffer.
(dos_async_rx): rewrite to unpack as many characters from the
asynctsr as possible into a local buffer.
Fri Aug 19 14:55:45 1994 Stan Shebs (shebs@andros.cygnus.com)
Initial Fortran language support, adapted from work by Farooq Butt

89
gdb/ser-go32.c
View File

@ -24,6 +24,7 @@
#define disable() asm("cli")
#define enable() asm("sti")
struct go32_ttystate
{
int bogus;
@ -82,6 +83,10 @@ static int dosasync_write PARAMS ((int fd, const char *buf, int len));
#define VERSION 1
#define OFFSET 0x104
char packet[50];
int packet_len;
int packet_idx;
unsigned char bb;
unsigned short sb;
unsigned long sl;
@ -94,7 +99,7 @@ unsigned long sl;
#define GET_LONG(x) ( dosmemget((x),4,&sl), sl)
static
unsigned short
unsigned short
GET_WORD (x)
{
unsigned short sb;
@ -185,6 +190,9 @@ dos_async_ready ()
{
int ret;
if (packet_idx < packet_len)
return 1;
disable ();
#if RDY_CNT
ret = GET_WORD (aindex + AOFF_COUNT);
@ -203,24 +211,70 @@ dos_async_rx ()
char rv;
short idx;
while (!dos_async_ready ())
while (1)
{
if (kbhit ())
if (packet_idx < packet_len)
{
printf_unfiltered ("abort!\n");
return 0;
char x = packet[packet_idx++];
return x;
}
while (!dos_async_ready ())
{
if (kbhit ())
{
printf_unfiltered ("abort!\n");
return 0;
}
}
disable ();
{
/* Sometimes we can read more than one char at a time
from the buffer, which is good, cause it'll mean
less time with interrupts turned off, which means
less dropped characters */
/* We only do the simplest case here - not bothering with
wrap around */
int len;
int getp = GET_WORD (aindex + AOFF_GETP);
int putp = GET_WORD (aindex + AOFF_PUTP);
int endb = GET_WORD (aindex + AOFF_BUFFER_END);
int startb = GET_WORD (aindex + AOFF_BUFFER_START);
/* We'd like to grab to the end of the the input,
but it may have wrapped, so max is to the end
of the buffer */
if (putp > endb || putp < getp)
putp = endb;
/* Work out the length of the suck */
len = putp - getp;
/* But only suck as many as we can hold in one go */
if (len > sizeof (packet))
len = sizeof (packet);
dosmemget (aindex - OFFSET + getp, len, packet);
packet_len = len;
packet_idx = 0;
if (getp + len >= endb)
{
getp = startb;
}
else
{
getp = getp + len;
}
SET_WORD (aindex + AOFF_GETP, getp);
SET_WORD (aindex + AOFF_COUNT, GET_WORD (aindex + AOFF_COUNT) - len);
}
enable ();
}
disable ();
idx = GET_WORD (aindex + AOFF_GETP);
idx++;
SET_WORD (aindex + AOFF_GETP, idx);
rv = aptr (idx - 1);
SET_WORD (aindex + AOFF_COUNT, GET_WORD (aindex + AOFF_COUNT) - 1);
if (GET_WORD (aindex + AOFF_GETP) > GET_WORD (aindex + AOFF_BUFFER_END))
SET_WORD (aindex + AOFF_GETP, GET_WORD (aindex + AOFF_BUFFER_START));
enable ();
return rv;
}
@ -233,7 +287,7 @@ dosasync_read (fd, buf, len, timeout)
{
long now, then;
int i;
int its = 0;
time (&now);
then = now + timeout;
@ -244,8 +298,9 @@ dosasync_read (fd, buf, len, timeout)
while (!dos_async_ready ())
{
time (&now);
if (now >= then && timeout > 0)
if (now >= then && timeout > 0 && its > 1000)
return i;
its++;
}
}
*buf++ = dos_async_rx ();