Justin C. Miller
c3abe035c8
The TCB is always stored at a constant offset within the thread object. So instead of carrying an extra pointer, just implement thread::from_tcb to get the thread.
91 lines
1.7 KiB
C++
91 lines
1.7 KiB
C++
#include "j6/signals.h"
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#include "objects/thread.h"
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#include "objects/process.h"
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#include "scheduler.h"
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static constexpr j6_signal_t thread_default_signals = 0;
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thread::thread(process &parent, uint8_t pri) :
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kobject(kobject::type::thread, thread_default_signals),
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m_parent(parent),
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m_state(state::loading),
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m_wait_type(wait_type::none),
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m_wait_data(0),
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m_wait_obj(0)
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{
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TCB *tcbp = tcb();
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tcbp->pml4 = parent.pml4();
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tcbp->priority = pri;
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set_state(state::ready);
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}
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thread *
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thread::from_tcb(TCB *tcb)
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{
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static ptrdiff_t offset =
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-1 * static_cast<ptrdiff_t>(offsetof(thread, m_tcb));
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return reinterpret_cast<thread*>(kutil::offset_pointer(tcb, offset));
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}
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void
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thread::wait_on_signals(kobject *obj, j6_signal_t signals)
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{
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m_wait_type = wait_type::signal;
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m_wait_data = signals;
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clear_state(state::ready);
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}
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void
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thread::wait_on_time(uint64_t t)
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{
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m_wait_type = wait_type::time;
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m_wait_data = t;
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clear_state(state::ready);
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}
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bool
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thread::wake_on_signals(kobject *obj, j6_signal_t signals)
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{
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if (m_wait_type != wait_type::signal ||
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(signals & m_wait_data) == 0)
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return false;
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m_wait_type = wait_type::none;
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m_wait_data = j6_status_ok;
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m_wait_obj = obj->koid();
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set_state(state::ready);
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return true;
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}
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bool
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thread::wake_on_time(uint64_t now)
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{
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if (m_wait_type != wait_type::time ||
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now < m_wait_data)
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return false;
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m_wait_type = wait_type::none;
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m_wait_data = j6_status_ok;
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m_wait_obj = 0;
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set_state(state::ready);
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return true;
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}
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void
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thread::wake_on_result(kobject *obj, j6_status_t result)
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{
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m_wait_type = wait_type::none;
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m_wait_data = result;
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m_wait_obj = obj->koid();
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set_state(state::ready);
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}
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void
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thread::exit(uint32_t code)
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{
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m_return_code = code;
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set_state(state::exited);
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clear_state(state::ready);
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}
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