Messages in this thread | | | From | "karl malbrain" <> | Subject | 2.6.9: serial_core: uart_open | Date | Tue, 12 Jul 2005 11:36:51 -0700 |
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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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