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detach-c.ri
U:RDoc::AnyMethod[iI" detach:ETI"Process::detach;TT: publico:RDoc::Markup::Document: @parts[o: RDoc::Markup::Paragraph; [ I"BSome operating systems retain the status of terminated child ;TI"Eprocesses until the parent collects that status (normally using ;TI"Hsome variant of <code>wait()</code>). If the parent never collects ;TI"Gthis status, the child stays around as a <em>zombie</em> process. ;TI"HProcess::detach prevents this by setting up a separate Ruby thread ;TI"Gwhose sole job is to reap the status of the process _pid_ when it ;TI"Gterminates. Use #detach only when you do not intend to explicitly ;TI"%wait for the child to terminate.;To: RDoc::Markup::BlankLine o; ; [ I"HThe waiting thread returns the exit status of the detached process ;TI"7when it terminates, so you can use Thread#join to ;TI"Gknow the result. If specified _pid_ is not a valid child process ;TI".ID, the thread returns +nil+ immediately.;T@o; ; [I">The waiting thread has #pid method which returns the pid.;T@o; ; [I"FIn this first example, we don't reap the first child process, so ;TI":it appears as a zombie in the process status display.;T@o:RDoc::Markup::Verbatim; [ I" p1 = fork { sleep 0.1 } ;TI" p2 = fork { sleep 0.2 } ;TI"Process.waitpid(p2) ;TI" sleep 2 ;TI")system("ps -ho pid,state -p #{p1}") ;T: @format0o; ; [I"<em>produces:</em>;T@o; ; [I" 27389 Z ;T; 0o; ; [I":In the next example, Process::detach is used to reap ;TI" the child automatically.;T@o; ; [ I" p1 = fork { sleep 0.1 } ;TI" p2 = fork { sleep 0.2 } ;TI"Process.detach(p1) ;TI"Process.waitpid(p2) ;TI" sleep 2 ;TI")system("ps -ho pid,state -p #{p1}") ;T; 0o; ; [I""<em>(produces no output)</em>;T: @fileI"process.c;T:0@omit_headings_from_table_of_contents_below0I"%Process.detach(pid) -> thread ;T0[ I" (p1);T@?FI" Process;TcRDoc::NormalModule00