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644f5ec160
Because pthread_create will always call pthread_exit internally before exiting the thread function, we can remove the odd requirement that the user's thread function must call Thread::quit internally. Make Thread::join clear m_tid on success, and print to stderr on failure. Call join from ~Thread(). Now if you write an infinite loop in your thread in an application and don't have an exit condition, you will block in the thread's destructor forever. Time for stop_token? :)
83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibThread/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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LibThread::Thread::Thread(Function<int()> action, StringView thread_name)
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: Core::Object(nullptr)
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, m_action(move(action))
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, m_thread_name(thread_name.is_null() ? "" : thread_name)
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{
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}
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LibThread::Thread::~Thread()
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{
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if (m_tid) {
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dbg() << "trying to destroy a running thread!";
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join();
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}
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}
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void LibThread::Thread::start()
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{
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int rc = pthread_create(
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&m_tid,
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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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size_t exit_code = self->m_action();
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self->m_tid = 0;
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return (void*)exit_code;
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},
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static_cast<void*>(this));
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ASSERT(rc == 0);
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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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ASSERT(rc == 0);
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}
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dbg() << "Started a thread, tid = " << m_tid;
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}
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void LibThread::Thread::join()
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{
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int rc = pthread_join(m_tid, nullptr);
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if (rc == 0)
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m_tid = 0;
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else
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warnln("pthread_join: {}", strerror(rc));
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}
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void LibThread::Thread::quit(void* code)
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{
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ASSERT(m_tid == pthread_self());
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m_tid = 0;
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pthread_exit(code);
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}
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