I want to send a big amount of data to a child process through pipe. However, it is stated in the documentation that writing too much into the pipe may cause a deadlock.
TProcess.Input

Input is a stream which is connected to the process' standard input file handle. Anything written to this stream can be read by the process.

The Input stream is only instantiated when the poUsePipes flag is used in Options
<http://lazarus-ccr.sourceforge.net/docs/fcl/process/tprocess.options.html>.

Note that writing to the stream may cause the calling process to be suspended when the created process is not reading from it's input, or to cause errors when the process has terminated.

How can I prevent from deadlock?
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"Ki?n Nguy?n Ti?n Trung" wrote

I want to send a big amount of data to a child process through pipe.

However, it is stated in the documentation that writing too much into the pipe may cause a deadlock.

That is not necessarily a deadlock. It just blocks until the receiving profess is ready to process more input. Of course you should process it's output, cause if it can't write into its output anymore it can't normally read from its input either ;)
That said you could write into the Input in a separate thread, this way your GUI stays responsive.

Regards,
Sven
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Thank you. I will try again with multi threading.

2015-10-09 22:10 GMT+07:00 Sven Barth :

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