321 lines
8.7 KiB
C++
321 lines
8.7 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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thread.cpp
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Describes a thread belonging to a process.
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*******************************************************************************/
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#include <sys/wait.h>
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <sortix/exit.h>
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#include <sortix/mman.h>
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#include <sortix/signal.h>
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#include <sortix/kernel/copy.h>
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#include <sortix/kernel/interrupt.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/memorymanagement.h>
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#include <sortix/kernel/process.h>
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#include <sortix/kernel/scheduler.h>
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#include <sortix/kernel/syscall.h>
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#include <sortix/kernel/thread.h>
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#include <sortix/kernel/time.h>
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namespace Sortix {
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Thread::Thread()
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{
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id = 0; // TODO: Make a thread id.
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process = NULL;
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prevsibling = NULL;
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nextsibling = NULL;
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schedulerlistprev = NULL;
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schedulerlistnext = NULL;
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state = NONE;
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memset(®isters, 0, sizeof(registers));
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fsbase = 0;
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gsbase = 0;
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kernelstackpos = 0;
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kernelstacksize = 0;
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kernelstackmalloced = false;
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pledged_destruction = false;
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terminated = false;
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fpuinitialized = false;
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// If malloc isn't 16-byte aligned, then we can't rely on offsets in
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// our own class, so we'll just fix ourselves nicely up.
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unsigned long fpuaddr = ((unsigned long) fpuenv+16UL) & ~(16UL-1UL);
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fpuenvaligned = (uint8_t*) fpuaddr;
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sigemptyset(&signal_pending);
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sigemptyset(&signal_mask);
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memset(&signal_stack, 0, sizeof(signal_stack));
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signal_stack.ss_flags = SS_DISABLE;
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}
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Thread::~Thread()
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{
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if ( process )
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process->OnThreadDestruction(this);
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assert(CurrentThread() != this);
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if ( kernelstackmalloced )
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delete[] (uint8_t*) kernelstackpos;
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terminated = true;
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}
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addr_t Thread::SwitchAddressSpace(addr_t newaddrspace)
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{
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bool wasenabled = Interrupt::SetEnabled(false);
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addr_t result = addrspace;
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addrspace = newaddrspace;
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Memory::SwitchAddressSpace(newaddrspace);
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Interrupt::SetEnabled(wasenabled);
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return result;
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}
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extern "C" void BootstrapKernelThread(void* user, ThreadEntry entry)
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{
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entry(user);
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kthread_exit();
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}
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Thread* CreateKernelThread(Process* process, CPU::InterruptRegisters* regs,
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unsigned long fsbase, unsigned long gsbase)
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{
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#if defined(__x86_64__)
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if ( fsbase >> 48 != 0x0000 && fsbase >> 48 != 0xFFFF )
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return errno = EINVAL, (Thread*) NULL;
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if ( gsbase >> 48 != 0x0000 && gsbase >> 48 != 0xFFFF )
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return errno = EINVAL, (Thread*) NULL;
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#endif
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assert(process && regs && process->addrspace);
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Thread* thread = new Thread;
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if ( !thread )
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return NULL;
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thread->addrspace = process->addrspace;
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thread->SaveRegisters(regs);
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thread->fsbase = fsbase;
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thread->gsbase = gsbase;
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kthread_mutex_lock(&process->threadlock);
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// Create the family tree.
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thread->process = process;
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Thread* firsty = process->firstthread;
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if ( firsty )
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firsty->prevsibling = thread;
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thread->nextsibling = firsty;
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process->firstthread = thread;
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kthread_mutex_unlock(&process->threadlock);
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return thread;
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}
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Thread* CreateKernelThread(Process* process, ThreadEntry entry, void* user,
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size_t stacksize)
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{
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const size_t DEFAULT_KERNEL_STACK_SIZE = 8 * 1024UL;
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if ( !stacksize )
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stacksize = DEFAULT_KERNEL_STACK_SIZE;
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uint8_t* stack = new uint8_t[stacksize];
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if ( !stack )
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return NULL;
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CPU::InterruptRegisters regs;
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SetupKernelThreadRegs(®s, entry, user, (addr_t) stack, stacksize);
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Thread* thread = CreateKernelThread(process, ®s, 0, 0);
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if ( !thread ) { delete[] stack; return NULL; }
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thread->kernelstackpos = (addr_t) stack;
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thread->kernelstacksize = stacksize;
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thread->kernelstackmalloced = true;
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return thread;
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}
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Thread* CreateKernelThread(ThreadEntry entry, void* user, size_t stacksize)
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{
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return CreateKernelThread(CurrentProcess(), entry, user, stacksize);
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}
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void StartKernelThread(Thread* thread)
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{
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Scheduler::SetThreadState(thread, ThreadState::RUNNABLE);
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}
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Thread* RunKernelThread(Process* process, CPU::InterruptRegisters* regs)
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{
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Thread* thread = CreateKernelThread(process, regs, 0, 0);
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if ( !thread )
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return NULL;
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StartKernelThread(thread);
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return thread;
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}
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Thread* RunKernelThread(Process* process, ThreadEntry entry, void* user,
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size_t stacksize)
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{
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Thread* thread = CreateKernelThread(process, entry, user, stacksize);
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if ( !thread )
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return NULL;
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StartKernelThread(thread);
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return thread;
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}
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Thread* RunKernelThread(ThreadEntry entry, void* user, size_t stacksize)
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{
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Thread* thread = CreateKernelThread(entry, user, stacksize);
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if ( !thread )
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return NULL;
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StartKernelThread(thread);
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return thread;
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}
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static int sys_exit_thread(int requested_exit_code,
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int flags,
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const struct exit_thread* user_extended)
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{
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if ( flags & ~(EXIT_THREAD_ONLY_IF_OTHERS |
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EXIT_THREAD_UNMAP |
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EXIT_THREAD_ZERO |
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EXIT_THREAD_TLS_UNMAP |
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EXIT_THREAD_PROCESS |
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EXIT_THREAD_DUMP_CORE) )
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return errno = EINVAL, -1;
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if ( (flags & EXIT_THREAD_ONLY_IF_OTHERS) && (flags & EXIT_THREAD_PROCESS) )
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return errno = EINVAL, -1;
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Thread* thread = CurrentThread();
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Process* process = CurrentProcess();
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struct exit_thread extended;
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if ( !user_extended )
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memset(&extended, 0, sizeof(extended));
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else if ( !CopyFromUser(&extended, user_extended, sizeof(extended)) )
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return -1;
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extended.unmap_size = Page::AlignUp(extended.unmap_size);
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kthread_mutex_lock(&thread->process->threadlock);
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bool is_others = false;
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for ( Thread* iter = thread->process->firstthread;
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!is_others && iter;
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iter = iter->nextsibling )
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{
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if ( iter == thread )
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continue;
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if ( iter->pledged_destruction )
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continue;
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if ( iter->terminated )
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continue;
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is_others = true;
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}
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if ( !(flags & EXIT_THREAD_ONLY_IF_OTHERS) || is_others )
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thread->pledged_destruction = true;
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bool are_threads_exiting = false;
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if ( (flags & EXIT_THREAD_PROCESS) || !is_others )
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process->threads_exiting = true;
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else if ( process->threads_exiting )
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are_threads_exiting = true;
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kthread_mutex_unlock(&thread->process->threadlock);
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// Self-destruct if another thread began exiting the process.
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if ( are_threads_exiting )
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kthread_exit();
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if ( (flags & EXIT_THREAD_ONLY_IF_OTHERS) && !is_others )
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return errno = ESRCH, -1;
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if ( flags & EXIT_THREAD_UNMAP &&
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Page::IsAligned((uintptr_t) extended.unmap_from) &&
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extended.unmap_size )
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{
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ScopedLock lock(&process->segment_lock);
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Memory::UnmapMemory(process, (uintptr_t) extended.unmap_from,
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extended.unmap_size);
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Memory::Flush();
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// TODO: The segment is not actually removed!
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}
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if ( flags & EXIT_THREAD_TLS_UNMAP &&
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Page::IsAligned((uintptr_t) extended.tls_unmap_from) &&
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extended.tls_unmap_size )
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{
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ScopedLock lock(&process->segment_lock);
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Memory::UnmapMemory(process, (uintptr_t) extended.tls_unmap_from,
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extended.tls_unmap_size);
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Memory::Flush();
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}
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if ( flags & EXIT_THREAD_ZERO )
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ZeroUser(extended.zero_from, extended.zero_size);
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if ( !is_others )
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{
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// Validate the requested exit code such that the process can't exit
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// with an impossible exit status or that it wasn't actually terminated.
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int the_nature = WNATURE(requested_exit_code);
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int the_status = WEXITSTATUS(requested_exit_code);
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int the_signal = WTERMSIG(requested_exit_code);
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if ( the_nature == WNATURE_EXITED )
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the_signal = 0;
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else if ( the_nature == WNATURE_SIGNALED )
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{
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if ( the_signal == 0 /* null signal */ ||
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the_signal == SIGSTOP ||
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the_signal == SIGTSTP ||
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the_signal == SIGTTIN ||
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the_signal == SIGTTOU ||
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the_signal == SIGCONT )
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the_signal = SIGKILL;
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the_status = 128 + the_signal;
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}
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else
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{
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the_nature = WNATURE_SIGNALED;
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the_signal = SIGKILL;
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}
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requested_exit_code = WCONSTRUCT(the_nature, the_status, the_signal);
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thread->process->ExitWithCode(requested_exit_code);
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}
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kthread_exit();
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}
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void Thread::Init()
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{
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Syscall::Register(SYSCALL_EXIT_THREAD, (void*) sys_exit_thread);
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}
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} // namespace Sortix
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