On Fri, 2 Feb 2007, Sivakumar Jayapal-TLS,Chennai. wrote:
I have a XFree86 cross compiled for SH4 Renesas that is using QNX as operation system We have modified the XTrans completely to support Firewire (IEEE 1394) network. This XTrans modified (to work with threads) XFree86 was tested on X86 PC and found to be working fine. The same frame when tried executed from QNX, the fork fails and XTerm doesn't show up. The analysis confirms that threads are being created before the fork call is made and hence the fork fails. We substituted fork with Spawn, but the process id wasn't the same as the parent process. We tried changing the functions calling order that create threads after the fork is called, in this case the X comes up but it doesn't show the XTerm or allow mouse, keyboard support. What could be a solution for this?
If I understand you correctly, the problem is that the OS the client (say xterm) is running on does not allow a thread to fork. If that is so, there's very little I can suggest other than not to use threads. For reference, POSIX says ...
"A process shall be created with a single thread. If a multi-threaded process calls fork(), the new process shall contain a replica of the calling thread and its entire address space, possibly including the states of mutexes and other resources. Consequently, to avoid errors, the child process may only execute async-signal-safe operations until such time as one of the exec functions is called. Fork handlers may be established by means of the pthread_atfork() function in order to maintain application invariants across fork() calls."
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