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Top Forums Programming Problem regarding serial port and multithreading Post 302144920 by arunchaudhary19 on Monday 12th of November 2007 01:17:01 AM
Old 11-12-2007
Problem regarding serial port and multithreading

hello,

I am creating a application in which I first open the serial port and then create the thread..for reading the data comming through that serial port. from that same thread I create another thread that is write thread means for writing on the serial port...
I am continously polling again and again to check the data comming through that thread
the read thread is working correctly but due to write thread I am getting some different bahavior of the code...sometime segmentation fault...sometimes unwanted result etc....

can any body guide me where I am wrong...why unwanted bahavior of the code....
can Anybody guide me how many threads I can create in a program and where to create Should I use any precuations while writing multithreaded application....
 

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cyclades-devices(5)													       cyclades-devices(5)

NAME
cyclades-devices - tables for driving cyclades-serial-client DESCRIPTION
The cyclades-devices file supplies all mapping between Unix device files (/dev/*) and the addresses of serial ports of Cyclades Terminal Servers. It contains one entry for each serial port, with the following format: device:rastype:rasname:physport:type:options Note: A # character at beginning of line indicates a comment The entry fields are: devname - A full pathname of the file that will be associated to the serial port. It must start with a "/dev/" preffix. Two naming schemes may be used here: - devname does not exist, and will be linked to a free pseudo-tty. This is the default behavior of cyclades-ser- cli. - devname is the name of a valid slave pseudo-tty. In this case, the '-t 1' option must be assigned in options field. (Note: this option is not supported by this release). rastype - Terminal Server type: - prts, for Cyclades Pr302X/TS Terminal Servers. - path, for Cyclades PathRAS Terminal Server. rasname - Host Name or IP Address of the Terminal Server where the serial port resides. physport - Number of physical port in the Terminal Server. If treated as the IP address associated with this port, in a IP-based addressing scheme. type - Server type that will be contacted to handle the serial port: - rtelnet, for Remote Telnet Server - socket, for Socket Server options - Per-port specific options, passed to cyclades-ser-cli program. EXAMPLES
1. Device on a PR3020/TS Terminal Server pr3k Port 1, accessed through /dev/ctty01 device file name, using telnet protocol (remote telnet server) /dev/ctty01:prts:pr3k:1:rtelnet: 2. The same device, but with an IP address pr3k_port1 associated to the serial port (IP-based port addressing) /dev/ctty01:prts:pr3k_port1:0:rtelnet: 3. Device on a PathRAS Terminal Server pr3k Port 2, accessed through /dev/ctty02 device file name, using socket protocol (socket server) /dev/ctty02:path:pr3k:2:socket: FILES
/etc/cyclades-devices This file SEE ALSO
cyclades-serial-client(1), cyclades-ser-cli(1) cyclades-devices(5)
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