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(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
200 lines
6.4 KiB
C++
200 lines
6.4 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@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 <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <Kernel/Process.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/PageDirectory.h>
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namespace Kernel {
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int Process::sys$create_thread(void* (*entry)(void*), Userspace<const Syscall::SC_create_thread_params*> user_params)
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{
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REQUIRE_PROMISE(thread);
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Syscall::SC_create_thread_params params;
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if (!copy_from_user(¶ms, user_params))
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return -EFAULT;
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unsigned detach_state = params.m_detach_state;
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int schedule_priority = params.m_schedule_priority;
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unsigned stack_size = params.m_stack_size;
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auto user_stack_address = (u8*)params.m_stack_location + stack_size;
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if (!MM.validate_user_stack(*this, VirtualAddress(user_stack_address - 4)))
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return -EFAULT;
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// FIXME: return EAGAIN if Thread::all_threads().size() is greater than PTHREAD_THREADS_MAX
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int requested_thread_priority = schedule_priority;
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if (requested_thread_priority < THREAD_PRIORITY_MIN || requested_thread_priority > THREAD_PRIORITY_MAX)
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return -EINVAL;
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bool is_thread_joinable = (0 == detach_state);
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// FIXME: Do something with guard pages?
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auto thread_or_error = Thread::try_create(*this);
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if (thread_or_error.is_error())
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return thread_or_error.error();
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auto& thread = thread_or_error.value();
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// We know this thread is not the main_thread,
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// So give it a unique name until the user calls $set_thread_name on it
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// length + 4 to give space for our extra junk at the end
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StringBuilder builder(m_name.length() + 4);
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thread->set_name(String::formatted("{} [{}]", m_name, thread->tid().value()));
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if (!is_thread_joinable)
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thread->detach();
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auto& tss = thread->tss();
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tss.eip = (FlatPtr)entry;
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tss.eflags = 0x0202;
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tss.cr3 = space().page_directory().cr3();
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tss.esp = (u32)user_stack_address;
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auto tsr_result = thread->make_thread_specific_region({});
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if (tsr_result.is_error())
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return tsr_result.error();
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ScopedSpinLock lock(g_scheduler_lock);
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thread->set_priority(requested_thread_priority);
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thread->set_state(Thread::State::Runnable);
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return thread->tid().value();
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}
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void Process::sys$exit_thread(Userspace<void*> exit_value)
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{
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REQUIRE_PROMISE(thread);
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cli();
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if (this->thread_count() == 1) {
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// If this is the last thread, instead kill the process.
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this->sys$exit(0);
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}
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Thread::current()->exit(reinterpret_cast<void*>(exit_value.ptr()));
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VERIFY_NOT_REACHED();
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}
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int Process::sys$detach_thread(pid_t tid)
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{
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REQUIRE_PROMISE(thread);
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auto thread = Thread::from_tid(tid);
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if (!thread || thread->pid() != pid())
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return -ESRCH;
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if (!thread->is_joinable())
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return -EINVAL;
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thread->detach();
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return 0;
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}
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int Process::sys$join_thread(pid_t tid, Userspace<void**> exit_value)
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{
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REQUIRE_PROMISE(thread);
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auto thread = Thread::from_tid(tid);
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if (!thread || thread->pid() != pid())
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return -ESRCH;
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auto current_thread = Thread::current();
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if (thread == current_thread)
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return -EDEADLK;
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void* joinee_exit_value = nullptr;
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// NOTE: pthread_join() cannot be interrupted by signals. Only by death.
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for (;;) {
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KResult try_join_result(KSuccess);
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auto result = current_thread->block<Thread::JoinBlocker>({}, *thread, try_join_result, joinee_exit_value);
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if (result == Thread::BlockResult::NotBlocked) {
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if (try_join_result.is_error())
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return try_join_result.error();
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break;
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}
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if (result == Thread::BlockResult::InterruptedByDeath)
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break;
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dbgln("join_thread: retrying");
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}
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if (exit_value && !copy_to_user(exit_value, &joinee_exit_value))
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return -EFAULT;
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return 0;
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}
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int Process::sys$set_thread_name(pid_t tid, Userspace<const char*> user_name, size_t user_name_length)
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{
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REQUIRE_PROMISE(stdio);
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auto name = copy_string_from_user(user_name, user_name_length);
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if (name.is_null())
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return -EFAULT;
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const size_t max_thread_name_size = 64;
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if (name.length() > max_thread_name_size)
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return -EINVAL;
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auto thread = Thread::from_tid(tid);
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if (!thread || thread->pid() != pid())
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return -ESRCH;
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thread->set_name(move(name));
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return 0;
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}
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int Process::sys$get_thread_name(pid_t tid, Userspace<char*> buffer, size_t buffer_size)
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{
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REQUIRE_PROMISE(thread);
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if (buffer_size == 0)
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return -EINVAL;
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auto thread = Thread::from_tid(tid);
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if (!thread || thread->pid() != pid())
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return -ESRCH;
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// We must make a temporary copy here to avoid a race with sys$set_thread_name
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auto thread_name = thread->name();
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if (thread_name.length() + 1 > (size_t)buffer_size)
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return -ENAMETOOLONG;
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if (!copy_to_user(buffer, thread_name.characters(), thread_name.length() + 1))
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return -EFAULT;
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return 0;
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}
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int Process::sys$gettid()
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{
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REQUIRE_PROMISE(stdio);
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return Thread::current()->tid().value();
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}
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}
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