Date: Mon, 27 Jun 2005 19:38:00 +0200 From: "Ronald Klop" <ronald-freebsd8@klop.yi.org> To: "Achilleus Mantzios" <achill@matrix.gatewaynet.com>, freebsd-java@freebsd.org Subject: Re: Wierd problem in linux 2.4.18-bf2.4, Java Blackdown-1.4.2-rc1 (Solved) Message-ID: <op.ss1hxmcj8527sy@outgoing.local> In-Reply-To: <Pine.LNX.4.44.0506271142350.9419-100000@matrix.gatewaynet.com> References: <Pine.LNX.4.44.0506271142350.9419-100000@matrix.gatewaynet.com>
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On Mon, 27 Jun 2005 11:14:14 +0200, Achilleus Mantzios <achill@matrix.gatewaynet.com> wrote: > > Forgot my homework.... > A classic (lack of) consumption of output situation, > >> From the java docs: > > The Runtime.exec methods may not work well for special processes on > certain native platforms, such as native windowing processes, daemon > processes, Win16/DOS processes on Microsoft Windows, or shell scripts. > The > created subprocess does not have its own terminal or console. All its > standard io (i.e. stdin, stdout, stderr) operations will be redirected to > the parent process through three streams (Process.getOutputStream(), > Process.getInputStream(), Process.getErrorStream()). The parent process > uses these streams to feed input to and get output from the subprocess. > Because some native platforms only provide limited buffer size for > standard input and output streams, failure to promptly write the input > stream or read the output stream of the subprocess may cause the > subprocess to block, and even deadlock. > > > Sorry for the noise, the situation can pretty well > occur in FreeBSD too when pipe output buffer reaches its limit, > and at the end of the day i think someone maybe will find this > useful in the future. I always create two threads to copy the output of stdout and stderr to some place. (/dev/null or a file or System.out). In java 5 you can combine stdout and stderr, so you only need 1 thread. -- Ronald Klop Amsterdam, The Netherlands
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