/*
 * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <LibThread/Thread.h>
#include <pthread.h>
#include <unistd.h>

LibThread::Thread::Thread(Function<int()> action, StringView thread_name)
    : Core::Object(nullptr)
    , m_action(move(action))
    , m_thread_name(thread_name.is_null() ? "" : thread_name)
{
}

LibThread::Thread::~Thread()
{
    if (m_tid) {
        dbg() << "trying to destroy a running thread!";
        ASSERT_NOT_REACHED();
    }
}

void LibThread::Thread::start()
{
    int rc = pthread_create(
        &m_tid,
        nullptr,
        [](void* arg) -> void* {
            Thread* self = static_cast<Thread*>(arg);
            size_t exit_code = self->m_action();
            self->m_tid = 0;
            pthread_exit((void*)exit_code);
            return (void*)exit_code;
        },
        static_cast<void*>(this));

    ASSERT(rc == 0);
    if (!m_thread_name.is_empty()) {
        rc = pthread_setname_np(m_tid, m_thread_name.characters());
        ASSERT(rc == 0);
    }
    dbg() << "Started a thread, tid = " << m_tid;
}

void LibThread::Thread::quit(void *code)
{
    ASSERT(m_tid == pthread_self());

    m_tid = 0;
    pthread_exit(code);
}