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erlang
0129-Documentation-of-exit-signals-emitted-by-g...
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File 0129-Documentation-of-exit-signals-emitted-by-gen_server.patch of Package erlang
From 89c7682744d551a406f198b1f1441ab248b74956 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Viktor=20S=C3=B6derqvist?= <viktor.soderqvist@est.tech> Date: Thu, 24 Sep 2020 11:51:57 +0200 Subject: [PATCH] Documentation of exit signals emitted by gen_server The relation between Reason and the exit signal is described in various sections of the gen_server manual: * In the Description section, including a link to Receiving Exit Signals in the Reference Manual * Under start_link/3,4 * Under stop/1,3 * Under Module:init/1 * Under Module:terminate/2 --- lib/stdlib/doc/src/gen_server.xml | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/lib/stdlib/doc/src/gen_server.xml b/lib/stdlib/doc/src/gen_server.xml index 4abb91439e..364d4b95d6 100644 --- a/lib/stdlib/doc/src/gen_server.xml +++ b/lib/stdlib/doc/src/gen_server.xml @@ -99,6 +99,14 @@ gen_server:abcast -----> Module:handle_cast/2 in place of the time-out or hibernation value, which will immediately invoke the <c>handle_continue/2</c> callback.</p> + <p>If the <c>gen_server</c> process terminates, e.g. + as a result of a function in the callback module returning + <c>{stop,Reason,NewState}</c>, an exit signal with this <c>Reason</c> + is sent to linked processes and ports. See + <seeguide marker="system/reference_manual:processes#errors"> + Processes</seeguide> in the Reference Manual for details + regarding error handling using exit signals.</p> + </description> <funcs> @@ -546,7 +554,10 @@ gen_server:abcast -----> Module:handle_cast/2 the function returns <c>{error,Reason}</c>. If <c>Module:init/1</c> returns <c>{stop,Reason}</c> or <c>ignore</c>, the process is terminated and the function - returns <c>{error,Reason}</c> or <c>ignore</c>, respectively.</p> + returns <c>{error,Reason}</c> or <c>ignore</c>, respectively. + An exit signal with the same <c>Reason</c> (or <c>normal</c> if + <c>Module:init/1</c> returns <c>ignore</c>) is sent to linked + processes and ports.</p> </desc> </func> @@ -609,6 +620,8 @@ gen_server:abcast -----> Module:handle_cast/2 <c>shutdown</c>, or <c>{shutdown,Term}</c> causes an error report to be issued using <seeerl marker="kernel:logger"><c>logger(3)</c></seeerl>. + An exit signal with the same reason is sent to linked processes + and ports. The default <c>Reason</c> is <c>normal</c>.</p> <p><c>Timeout</c> is an integer greater than zero that specifies how many milliseconds to wait for the server to @@ -973,7 +986,11 @@ gen_server:abcast -----> Module:handle_cast/2 <c>proc_lib:hibernate/3</c></seemfa>).</p> <p>If the initialization fails, the function is to return <c>{stop,Reason}</c>, where <c>Reason</c> is any term, or - <c>ignore</c>.</p> + <c>ignore</c>. An exit signal with this <c>Reason</c> (or with reason + <c>normal</c> if <c>ignore</c> is returned) is sent to linked + processes and ports, notably to the process starting the gen_server + when <seemfa marker="#start_link/3"><c>start_link/3,4</c></seemfa> + is used.</p> </desc> </func> @@ -1028,6 +1045,8 @@ gen_server:abcast -----> Module:handle_cast/2 process is assumed to terminate because of an error and an error report is issued using <seeerl marker="kernel:logger"><c>logger(3)</c></seeerl>.</p> + <p>When the gen_server process exits, an exit signal with the same + reason is sent to linked processes and ports.</p> </desc> </func> </funcs> -- 2.26.2
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