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Kernel: Don't allocate memory for names of processes and threads

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Instead, use the FixedCharBuffer class to ensure we always use a static
buffer storage for these names. This ensures that if a Process or a
Thread were created, there's a guarantee that setting a new name will
never fail, as only copying of strings should be done to that static
storage.

The limits which are set are 32 characters for processes' names and 64
characters for thread names - this is because threads' names could be
more verbose than processes' names.
This commit is contained in:
Liav A
2023-07-17 18:34:19 +03:00
committed by Andrew Kaster
parent 0d30f558f4
commit 3fd4997fc2
22 changed files with 102 additions and 110 deletions
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22
Kernel/Tasks/Thread.cpp
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@@ -47,16 +47,18 @@ ErrorOr<NonnullRefPtr<Thread>> Thread::create(NonnullRefPtr<Process> process)
auto block_timer = TRY(try_make_ref_counted<Timer>());
auto name = TRY(process->name().with([](auto& name) { return name->try_clone(); }));
return adopt_nonnull_ref_or_enomem(new (nothrow) Thread(move(process), move(kernel_stack_region), move(block_timer), move(name)));
return adopt_nonnull_ref_or_enomem(new (nothrow) Thread(move(process), move(kernel_stack_region), move(block_timer)));
}
Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Memory::Region> kernel_stack_region, NonnullRefPtr<Timer> block_timer, NonnullOwnPtr<KString> name)
Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Memory::Region> kernel_stack_region, NonnullRefPtr<Timer> block_timer)
: m_process(move(process))
, m_kernel_stack_region(move(kernel_stack_region))
, m_name(move(name))
, m_block_timer(move(block_timer))
{
m_process->name().with([this](auto& process_name) {
set_name(process_name.representable_view());
});
bool is_first_thread = m_process->add_thread(*this);
if (is_first_thread) {
// First thread gets TID == PID
@@ -74,7 +76,7 @@ Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Memory::Region> ker
if constexpr (THREAD_DEBUG) {
m_process->name().with([&](auto& process_name) {
dbgln("Created new thread {}({}:{})", process_name->view(), m_process->pid().value(), m_tid.value());
dbgln("Created new thread {}({}:{})", process_name.representable_view(), m_process->pid().value(), m_tid.value());
});
}
@@ -1465,10 +1467,10 @@ void Thread::track_lock_release(LockRank rank)
m_lock_rank_mask ^= rank;
}
void Thread::set_name(NonnullOwnPtr<KString> name)
void Thread::set_name(StringView name)
{
m_name.with([&](auto& this_name) {
this_name = move(name);
m_name.with([name](auto& thread_name) {
thread_name.store_characters(name);
});
}
@@ -1476,9 +1478,9 @@ void Thread::set_name(NonnullOwnPtr<KString> name)
ErrorOr<void> AK::Formatter<Kernel::Thread>::format(FormatBuilder& builder, Kernel::Thread const& value)
{
return value.process().name().with([&](auto& process_name) {
return value.process().name().with([&](auto& thread_name) {
return AK::Formatter<FormatString>::format(
builder,
"{}({}:{})"sv, process_name->view(), value.pid().value(), value.tid().value());
"{}({}:{})"sv, thread_name.representable_view(), value.pid().value(), value.tid().value());
});
}