144 lines
4.2 KiB
C++
144 lines
4.2 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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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.h
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Describes a thread belonging to a process.
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*******************************************************************************/
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#ifndef SORTIX_THREAD_H
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#define SORTIX_THREAD_H
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#include <sortix/signal.h>
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#include "signal.h"
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typedef struct multiboot_info multiboot_info_t;
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namespace Sortix
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{
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class Process;
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class Thread;
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extern "C" void KernelInit(unsigned long magic, multiboot_info_t* bootinfo);
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typedef void (*ThreadEntry)(void* user);
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// Simply exits the kernel thread.
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void KernelThreadExit() SORTIX_NORETURN;
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// Internally used as a kernel thread entry point that exits the thread
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// upon the actual thread entry returning.
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extern "C" void BootstrapKernelThread(void* user, ThreadEntry entry) SORTIX_NORETURN;
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// These functions create a new kernel process but doesn't start it.
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Thread* CreateKernelThread(Process* process, CPU::InterruptRegisters* regs);
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Thread* CreateKernelThread(Process* process, ThreadEntry entry, void* user,
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size_t stacksize = 0);
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Thread* CreateKernelThread(ThreadEntry entry, void* user, size_t stacksize = 0);
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// This function can be used to start a thread from the above functions.
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void StartKernelThread(Thread* thread);
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// Alternatively, these functions both create and start the thread.
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Thread* RunKernelThread(Process* process, CPU::InterruptRegisters* regs);
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Thread* RunKernelThread(Process* process, ThreadEntry entry, void* user,
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size_t stacksize = 0);
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Thread* RunKernelThread(ThreadEntry entry, void* user, size_t stacksize = 0);
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void SetupKernelThreadRegs(CPU::InterruptRegisters* regs, ThreadEntry entry,
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void* user, addr_t stack, size_t stacksize);
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extern "C" void Thread__OnSigKill(Thread* thread);
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typedef void (*sighandler_t)(int);
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class Thread
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{
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friend Thread* CreateKernelThread(Process* process,
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CPU::InterruptRegisters* regs);
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friend void KernelInit(unsigned long magic, multiboot_info_t* bootinfo);
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friend void Thread__OnSigKill(Thread* thread);
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public:
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enum State { NONE, RUNNABLE, BLOCKING, DEAD };
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public:
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static void Init();
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private:
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Thread();
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public:
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~Thread();
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public:
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size_t id;
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Process* process;
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bool terminated;
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Thread* prevsibling;
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Thread* nextsibling;
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// These are some things used internally by the scheduler and should not be
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// touched by anything but it. Consider it private.
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public:
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Thread* schedulerlistprev;
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Thread* schedulerlistnext;
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volatile State state;
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public:
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addr_t addrspace;
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addr_t stackpos;
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size_t stacksize;
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sighandler_t sighandler;
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addr_t kernelstackpos;
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size_t kernelstacksize;
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bool kernelstackmalloced;
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private:
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CPU::InterruptRegisters registers;
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Signal::Queue signalqueue;
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int currentsignal;
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int siglevel;
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int signums[SIG_NUM_LEVELS];
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CPU::InterruptRegisters sigregs[SIG_NUM_LEVELS];
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public:
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void SaveRegisters(const CPU::InterruptRegisters* src);
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void LoadRegisters(CPU::InterruptRegisters* dest);
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void HandleSignal(CPU::InterruptRegisters* regs);
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void HandleSigreturn(CPU::InterruptRegisters* regs);
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bool DeliverSignal(int signum);
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addr_t SwitchAddressSpace(addr_t newaddrspace);
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private:
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void GotoOnSigKill(CPU::InterruptRegisters* regs);
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void OnSigKill() SORTIX_NORETURN;
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void LastPrayer();
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void SetHavePendingSignals();
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void HandleSignalFixupRegsCPU(CPU::InterruptRegisters* regs);
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void HandleSignalCPU(CPU::InterruptRegisters* regs);
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};
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Thread* CurrentThread();
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}
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#endif
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