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author | Steve Chamberlain <sac@cygnus> | 1994-08-22 17:58:47 +0000 |
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committer | Steve Chamberlain <sac@cygnus> | 1994-08-22 17:58:47 +0000 |
commit | be5e6fff5a0b3abbcbd6c5129c3286e057ed1bbd (patch) | |
tree | 104acb84b4c43f7d26408c6edf2a190477ac284d /gdb | |
parent | e914ed521998a45e6cd6584ce9b845d8e9255302 (diff) | |
download | gdb-be5e6fff5a0b3abbcbd6c5129c3286e057ed1bbd.zip gdb-be5e6fff5a0b3abbcbd6c5129c3286e057ed1bbd.tar.gz gdb-be5e6fff5a0b3abbcbd6c5129c3286e057ed1bbd.tar.bz2 |
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.
Diffstat (limited to 'gdb')
-rw-r--r-- | gdb/ChangeLog | 7 | ||||
-rw-r--r-- | gdb/ser-go32.c | 89 |
2 files changed, 79 insertions, 17 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index a7cc010..f60f0e0 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -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 diff --git a/gdb/ser-go32.c b/gdb/ser-go32.c index eced332..b1b5331 100644 --- a/gdb/ser-go32.c +++ b/gdb/ser-go32.c @@ -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) + { + char x = packet[packet_idx++]; + return x; + } + while (!dos_async_ready ()) { - printf_unfiltered ("abort!\n"); - return 0; + 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 (); |