83 lines
1.9 KiB
C++
83 lines
1.9 KiB
C++
/*
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* \brief Yield command
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* \author Norman Feske
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* \date 2013-10-05
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*/
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/*
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* Copyright (C) 2013-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _YIELD_COMMAND_H_
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#define _YIELD_COMMAND_H_
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/* local includes */
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#include <child_registry.h>
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namespace Cli_monitor { struct Yield_command; }
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struct Cli_monitor::Yield_command : Command
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{
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Child_registry &_children;
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Parameter _ram_param { "--ram", Parameter::NUMBER, "RAM quota to free" };
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Parameter _greedy_param { "--greedy", Parameter::VOID, "withdraw yielded RAM quota" };
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Yield_command(Child_registry &children)
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:
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Command("yield", "instruct subsystem to yield resources"),
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_children(children)
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{
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add_parameter(_ram_param);
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add_parameter(_greedy_param);
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}
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void _for_each_argument(Argument_fn const &fn) const override
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{
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auto child_name_fn = [&] (Child_base::Name const &child_name) {
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Argument arg(child_name.string(), "");
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fn(arg);
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};
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_children.for_each_child_name(child_name_fn);
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}
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void execute(Command_line &cmd, Terminal::Session &terminal) override
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{
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char label[128];
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label[0] = 0;
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if (cmd.argument(0, label, sizeof(label)) == false) {
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tprintf(terminal, "Error: no subsystem name specified\n");
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return;
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}
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Genode::Number_of_bytes ram = 0;
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cmd.parameter("--ram", ram);
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bool const greedy = cmd.parameter_exists("--greedy");
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/* lookup child by its unique name */
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Child *child = _children.first();
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for (; child; child = child->next())
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if (child->name() == label)
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break;
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if (!child) {
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tprintf(terminal, "Error: subsystem '%s' does not exist\n", label);
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return;
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}
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child->yield(ram, greedy);
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tprintf(terminal, "requesting '%s' to yield ", child->name().string());
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tprint_bytes(terminal, ram);
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tprintf(terminal, "\n");
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}
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};
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#endif /* _YIELD_COMMAND_H_ */
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