The uart_open code loops waiting for CD to be asserted (whenever CLOCAL
is not set). The bottom of the loop contains the following code:
up(&state->sem);
schedule();
down(&state->sem);
if( signal_pending(current) )
break;
When I issue an open("/dev/ttyS1", O_RDWR) from a terminal session on
the console, the system seems to come to a stop in this loop until the
process is killed. I suspect that the scheduler is choosing this process
to run again because of an elevated console priority of some sort.
Is there a kernel mechanism to put a process to sleep until awakened by
an event to replace this looping behaviour?
Thanks, karl malbrain, malbrain-at-yahoo-dot-com
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