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71df0ee994
Inheritance from `EventReceiver` on the `Thread` class was only used in the `BackgroundAction` class, where the children vector was keeping the action alive until the work was completed. However, this can be accomplished by instead capturing a `NonnullRefPtr` of `this`. The work function can then avoid having to remove the `BackgroundAction` from its parent `Thread` when the work completes.
132 lines
4.3 KiB
C++
132 lines
4.3 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibThreading/Thread.h>
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#include <pthread.h>
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#include <string.h>
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#include <unistd.h>
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namespace Threading {
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Thread::Thread(Function<intptr_t()> action, StringView thread_name)
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: m_action(move(action))
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, m_thread_name(thread_name.is_null() ? ""sv : thread_name)
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{
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}
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Thread::~Thread()
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{
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if (needs_to_be_joined()) {
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dbgln("Destroying {} while it is still running undetached!", *this);
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[[maybe_unused]] auto res = join();
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}
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if (m_state == ThreadState::Detached)
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dbgln("Bug! {} in state {} is being destroyed; AK/Function will crash shortly!", *this, m_state.load());
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}
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ErrorOr<void> Thread::set_priority(int priority)
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{
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// MacOS has an extra __opaque field, so list initialization will not compile on MacOS Lagom.
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sched_param scheduling_parameters {};
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scheduling_parameters.sched_priority = priority;
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int result = pthread_setschedparam(m_tid, 0, &scheduling_parameters);
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if (result != 0)
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return Error::from_errno(result);
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return {};
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}
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ErrorOr<int> Thread::get_priority() const
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{
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sched_param scheduling_parameters {};
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int policy;
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int result = pthread_getschedparam(m_tid, &policy, &scheduling_parameters);
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if (result != 0)
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return Error::from_errno(result);
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return scheduling_parameters.sched_priority;
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}
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DeprecatedString Thread::thread_name() const { return m_thread_name; }
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pthread_t Thread::tid() const { return m_tid; }
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ThreadState Thread::state() const { return m_state; }
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bool Thread::is_started() const { return m_state != ThreadState::Startable; }
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bool Threading::Thread::needs_to_be_joined() const
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{
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auto state = m_state.load();
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return state == ThreadState::Running || state == ThreadState::Exited;
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}
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bool Threading::Thread::has_exited() const
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{
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auto state = m_state.load();
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return state == ThreadState::Joined || state == ThreadState::Exited || state == ThreadState::DetachedExited;
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}
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void Thread::start()
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{
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VERIFY(!is_started());
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// Set this first so that the other thread starts out seeing m_state == Running.
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m_state = Threading::ThreadState::Running;
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int rc = pthread_create(
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&m_tid,
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// FIXME: Use pthread_attr_t to start a thread detached if that was requested by the user before the call to start().
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nullptr,
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[](void* arg) -> void* {
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Thread* self = static_cast<Thread*>(arg);
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auto exit_code = self->m_action();
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auto expected = Threading::ThreadState::Running;
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// This code might race with a call to detach().
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if (!self->m_state.compare_exchange_strong(expected, Threading::ThreadState::Exited)) {
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// If the original state was Detached, we need to set to DetachedExited instead.
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if (expected == Threading::ThreadState::Detached) {
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if (!self->m_state.compare_exchange_strong(expected, Threading::ThreadState::DetachedExited)) {
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dbgln("Thread logic bug: Found thread state {} while trying to set ExitedDetached state!", expected);
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VERIFY_NOT_REACHED();
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}
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} else {
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dbgln("Thread logic bug: Found thread state {} while trying to set Exited state!", expected);
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VERIFY_NOT_REACHED();
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}
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}
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return reinterpret_cast<void*>(exit_code);
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},
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static_cast<void*>(this));
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VERIFY(rc == 0);
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#ifdef AK_OS_SERENITY
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if (!m_thread_name.is_empty()) {
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rc = pthread_setname_np(m_tid, m_thread_name.characters());
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VERIFY(rc == 0);
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}
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#endif
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dbgln("Started {}", *this);
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}
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void Thread::detach()
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{
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auto expected = Threading::ThreadState::Running;
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// This code might race with the other thread exiting.
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if (!m_state.compare_exchange_strong(expected, Threading::ThreadState::Detached)) {
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if (expected == Threading::ThreadState::Exited)
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return;
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// Always report a precise error before crashing. These kinds of bugs are hard to reproduce.
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dbgln("Thread logic bug: trying to detach {} in state {}, which is neither Started nor Exited", this, expected);
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VERIFY_NOT_REACHED();
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}
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int rc = pthread_detach(m_tid);
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VERIFY(rc == 0);
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}
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}
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