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/*
* Copyright (c) 2020, the SerenityOS developers.
* Copyright (c) 2021-2023, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Singleton.h>
#include <Kernel/ProcessGroup.h>
namespace Kernel {
static Singleton<SpinlockProtected<ProcessGroup::AllInstancesList, LockRank::None>> s_all_instances;
SpinlockProtected<ProcessGroup::AllInstancesList, LockRank::None>& ProcessGroup::all_instances()
{
return s_all_instances;
}
ProcessGroup::~ProcessGroup() = default;
ErrorOr<NonnullRefPtr<ProcessGroup>> ProcessGroup::create_if_unused_pgid(ProcessGroupID pgid)
{
return all_instances().with([&](auto& all_instances) -> ErrorOr<NonnullRefPtr<ProcessGroup>> {
for (auto& process_group : all_instances) {
if (process_group.pgid() == pgid)
return EPERM;
}
auto process_group = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) ProcessGroup(pgid)));
all_instances.prepend(*process_group);
return process_group;
});
}
ErrorOr<NonnullRefPtr<ProcessGroup>> ProcessGroup::find_or_create(ProcessGroupID pgid)
{
return all_instances().with([&](auto& all_instances) -> ErrorOr<NonnullRefPtr<ProcessGroup>> {
for (auto& group : all_instances) {
if (group.pgid() == pgid)
return group;
}
auto process_group = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) ProcessGroup(pgid)));
all_instances.prepend(*process_group);
return process_group;
});
}
RefPtr<ProcessGroup> ProcessGroup::from_pgid(ProcessGroupID pgid)
{
return all_instances().with([&](auto& groups) -> RefPtr<ProcessGroup> {
for (auto& group : groups) {
if (group.pgid() == pgid)
return &group;
}
return nullptr;
});
}
}
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