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Asynchrnous character device interface.

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This commit is contained in:
Philip Homburg 2008-02-25 11:54:04 +00:00
parent 65df875abb
commit a51dbad054
2 changed files with 33 additions and 67 deletions
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5
drivers/log/Makefile
View file

@ -12,14 +12,15 @@ d = ..
MAKE = exec make
CC = exec cc
CFLAGS = -I$i $(CPROFILE)
LDFLAGS = -i -L../libdriver
LDFLAGS = -i -L../libdriver_asyn
LIBS = -lsysutil -ldriver -lsys
LIB_DEP = ../libdriver_asyn/libdriver.a
OBJ = log.o diag.o kputc.o
# build local binary
all build: $(DRIVER)
$(DRIVER): $(OBJ)
$(DRIVER): $(OBJ) $(LIB_DEP)
$(CC) -o $@ $(LDFLAGS) $(OBJ) $(LIBS)
install -S 16kb $(DRIVER)

95
drivers/log/log.c
View file

@ -107,8 +107,10 @@ PRIVATE int
subwrite(struct logdevice *log, int count, int proc_nr,
vir_bytes user_vir, size_t offset, int safe)
{
int d, r;
char *buf;
int r;
message m;
if (log->log_write + count > LOG_SIZE)
count = LOG_SIZE - log->log_write;
buf = log->log_buffer + log->log_write;
@ -145,8 +147,18 @@ subwrite(struct logdevice *log, int count, int proc_nr,
log->log_status = subread(log, log->log_iosize,
log->log_proc_nr, log->log_user_vir_g,
log->log_user_vir_offset, log->log_safe);
notify(log->log_source);
log->log_revive_alerted = 1;
m.m_type = DEV_REVIVE;
m.REP_ENDPT = log->log_proc_nr;
m.REP_STATUS = log->log_status;
m.REP_IO_GRANT = log->log_user_vir_g;
r= send(log->log_source, &m);
if (r != OK)
{
printf("log`subwrite: send to %d failed: %d\n",
log->log_source, r);
}
log->log_proc_nr = 0;
}
if(log->log_size > 0)
@ -160,11 +172,21 @@ subwrite(struct logdevice *log, int count, int proc_nr,
* swallow all the data (log_size > 0).
*/
if(log->log_selected & SEL_RD) {
notify(log->log_select_proc);
log->log_select_alerted = 1;
d= log-logdevices;
m.m_type = DEV_SEL_REPL2;
m.DEV_SEL_OPS = log->log_select_ready_ops;
m.DEV_MINOR = d;
#if LOG_DEBUG
printf("log notified %d\n", log->log_select_proc);
printf("select sending DEV_SEL_REPL2\n");
#endif
r= send(log->log_select_proc, &m);
if (r != OK)
{
printf(
"log`subwrite: send to %d failed: %d\n",
log->log_select_proc, r);
}
log->log_selected &= ~log->log_select_ready_ops;
}
}
@ -283,7 +305,7 @@ int safe; /* safe copies? */
printf("blocked %d (%d)\n",
log->log_source, log->log_proc_nr);
#endif
return(SUSPEND);
return(EDONTREPLY);
}
count = subread(log, count, proc_nr, user_vir, vir_offset, safe);
if(count < 0) {
@ -348,63 +370,6 @@ message *m_ptr;
return(OK);
}
/*============================================================================*
* do_status *
*============================================================================*/
PRIVATE void do_status(message *m_ptr)
{
int d;
message m;
/* Caller has requested pending status information, which currently
* can be pending available select()s, or REVIVE events. One message
* is returned for every event, or DEV_NO_STATUS if no (more) events
* are to be returned.
*/
for(d = 0; d < NR_DEVS; d++) {
/* Check for revive callback. */
if(logdevices[d].log_proc_nr && logdevices[d].log_revive_alerted
&& logdevices[d].log_source == m_ptr->m_source) {
m.m_type = DEV_REVIVE;
m.REP_ENDPT = logdevices[d].log_proc_nr;
m.REP_STATUS = logdevices[d].log_status;
m.REP_IO_GRANT = logdevices[d].log_user_vir_g;
send(m_ptr->m_source, &m);
logdevices[d].log_proc_nr = 0;
logdevices[d].log_revive_alerted = 0;
#if LOG_DEBUG
printf("revived %d with %d bytes\n",
m.REP_ENDPT, m.REP_STATUS);
#endif
return;
}
/* Check for select callback. */
if(logdevices[d].log_selected && logdevices[d].log_select_proc == m_ptr->m_source
&& logdevices[d].log_select_alerted) {
m.m_type = DEV_IO_READY;
m.DEV_SEL_OPS = logdevices[d].log_select_ready_ops;
m.DEV_MINOR = d;
#if LOG_DEBUG
printf("select sending sent\n");
#endif
send(m_ptr->m_source, &m);
logdevices[d].log_selected &= ~logdevices[d].log_select_ready_ops;
logdevices[d].log_select_alerted = 0;
#if LOG_DEBUG
printf("select send sent\n");
#endif
return;
}
}
/* No event found. */
m.m_type = DEV_NO_STATUS;
send(m_ptr->m_source, &m);
return;
}
/*============================================================================*
* log_signal *
@ -443,7 +408,7 @@ int safe;
break;
}
case DEV_STATUS: {
do_status(m_ptr);
printf("log_other: unexpected DEV_STATUS request\n");
r = EDONTREPLY;
break;
}