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Top Forums Shell Programming and Scripting How to block first bash script until second bash script script launches web server/site? Post 303027204 by siegfried on Monday 10th of December 2018 09:05:57 PM
Old 12-10-2018
How to block first bash script until second bash script script launches web server/site?

I'm new to utilities like socat and netcat and I'm not clear if they will do what I need.

I have a "compileDeployStartWebServer.sh" script and a "StartBrowser.sh" script that are started by emacs/elisp at the same time in two different processes.

I'm using Cygwin bash on Windows 10.

My compileDeployStartWebServer.sh compiles the java code and starts the web server on port 8080.

Presently, the "StartBrowser.sh" sleeps for 40 seconds and launches a browser like Chrome or Firefox while the "compileDeployStartWebServer.sh" downloads any dependencies using maven or gradle, compiles the code and starts the web server. This takes a while!

So my plan was to enhance the java startup code in the web site to write "starting" to a UDP socket on port 7777. Alternatively, the java startup code could spawn a new child thread to write "starting" to a TCP socket so it the web site startup code won't block on the TCP socket in case I decide to run without the "StartBrowser.sh" script.

So is there a way to enhance the "StartBrowser.sh" to block on the TCP (or UDP) socket instead of sleeping? I could write some more java code, I suppose.

What would you recommend? UDP? TCP? What could I use to block the "StartBrowser.sh" (besides more custom java code) while the other script is busy downloading dependencies, compiling, deploying and starting the web server? flock?, exec? netcat? socat? something else?

Perhaps I should be using mutexes or semaphores instead? I don't think java has good support for these features, however.

Thanks
Siegfried

Last edited by siegfried; 12-10-2018 at 10:25 PM..
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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