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CPUThread.cpp
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CPUThread.cpp
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#include "stdafx.h"
#include "CPUThread.h"
#include "Emu/System.h"
#include "Emu/Memory/vm_locking.h"
#include "Emu/IdManager.h"
#include "Utilities/GDBDebugServer.h"
#include "Emu/Cell/PPUThread.h"
#include "Emu/Cell/SPUThread.h"
DECLARE(cpu_thread::g_threads_created){0};
DECLARE(cpu_thread::g_threads_deleted){0};
template <>
void fmt_class_string<cpu_flag>::format(std::string& out, u64 arg)
{
format_enum(out, arg, [](cpu_flag f)
{
switch (f)
{
case cpu_flag::stop: return "STOP";
case cpu_flag::exit: return "EXIT";
case cpu_flag::wait: return "w";
case cpu_flag::pause: return "p";
case cpu_flag::suspend: return "s";
case cpu_flag::ret: return "ret";
case cpu_flag::signal: return "sig";
case cpu_flag::memory: return "mem";
case cpu_flag::jit_return: return "JIT";
case cpu_flag::dbg_global_pause: return "G-PAUSE";
case cpu_flag::dbg_global_stop: return "G-EXIT";
case cpu_flag::dbg_pause: return "PAUSE";
case cpu_flag::dbg_step: return "STEP";
case cpu_flag::__bitset_enum_max: break;
}
return unknown;
});
}
template<>
void fmt_class_string<bs_t<cpu_flag>>::format(std::string& out, u64 arg)
{
format_bitset(out, arg, "[", "|", "]", &fmt_class_string<cpu_flag>::format);
}
thread_local cpu_thread* g_tls_current_cpu_thread = nullptr;
// For synchronizing suspend_all operation
alignas(64) shared_mutex g_cpu_suspend_lock;
// Semaphore for global thread array (global counter)
alignas(64) atomic_t<u32> g_cpu_array_sema{0};
// Semaphore subdivision for each array slot (64 x N in total)
atomic_t<u64> g_cpu_array_bits[6]{};
// All registered threads
atomic_t<cpu_thread*> g_cpu_array[sizeof(g_cpu_array_bits) * 8]{};
template <typename F>
void for_all_cpu(F&& func) noexcept
{
for (u32 i = 0; i < ::size32(g_cpu_array_bits); i++)
{
for (u64 bits = g_cpu_array_bits[i]; bits; bits &= bits - 1)
{
const u64 index = i * 64 + utils::cnttz64(bits, true);
if (cpu_thread* cpu = g_cpu_array[index].load())
{
func(cpu);
}
}
}
}
void cpu_thread::operator()()
{
g_tls_current_cpu_thread = this;
if (g_cfg.core.thread_scheduler_enabled)
{
thread_ctrl::set_thread_affinity_mask(thread_ctrl::get_affinity_mask(id_type() == 1 ? thread_class::ppu : thread_class::spu));
}
if (g_cfg.core.lower_spu_priority && id_type() == 2)
{
thread_ctrl::set_native_priority(-1);
}
// Register thread in g_cpu_array
if (!g_cpu_array_sema.try_inc(sizeof(g_cpu_array_bits) * 8))
{
LOG_FATAL(GENERAL, "Too many threads");
Emu.Pause();
return;
}
u64 array_slot = -1;
for (u32 i = 0;; i = (i + 1) % ::size32(g_cpu_array_bits))
{
if (LIKELY(~g_cpu_array_bits[i]))
{
const u64 found = g_cpu_array_bits[i].atomic_op([](u64& bits) -> u64
{
// Find empty array slot and set its bit
if (LIKELY(~bits))
{
const u64 bit = utils::cnttz64(~bits, true);
bits |= 1ull << bit;
return bit;
}
return 64;
});
if (LIKELY(found < 64))
{
// Fixup
array_slot = i * 64 + found;
break;
}
}
}
// Register and wait if necessary
verify("g_cpu_array[...] -> this" HERE), g_cpu_array[array_slot].exchange(this) == nullptr;
state += cpu_flag::wait;
g_cpu_suspend_lock.lock_unlock();
// Check thread status
while (!(state & (cpu_flag::exit + cpu_flag::dbg_global_stop)))
{
// Check stop status
if (!(state & cpu_flag::stop))
{
try
{
cpu_task();
}
catch (cpu_flag _s)
{
state += _s;
}
catch (const std::exception& e)
{
Emu.Pause();
LOG_FATAL(GENERAL, "%s thrown: %s", typeid(e).name(), e.what());
LOG_NOTICE(GENERAL, "\n%s", dump());
break;
}
state -= cpu_flag::ret;
continue;
}
thread_ctrl::wait();
}
// Unregister and wait if necessary
state += cpu_flag::wait;
verify("g_cpu_array[...] -> null" HERE), g_cpu_array[array_slot].exchange(nullptr) == this;
g_cpu_array_bits[array_slot / 64] &= ~(1ull << (array_slot % 64));
g_cpu_array_sema--;
g_cpu_suspend_lock.lock_unlock();
}
void cpu_thread::on_abort()
{
state += cpu_flag::exit;
}
cpu_thread::~cpu_thread()
{
vm::cleanup_unlock(*this);
g_threads_deleted++;
}
cpu_thread::cpu_thread(u32 id)
: id(id)
{
g_threads_created++;
}
bool cpu_thread::check_state() noexcept
{
#ifdef WITH_GDB_DEBUGGER
if (state & cpu_flag::dbg_pause)
{
fxm::get<GDBDebugServer>()->pause_from(this);
}
#endif
bool cpu_sleep_called = false;
bool cpu_flag_memory = false;
if (!(state & cpu_flag::wait))
{
state += cpu_flag::wait;
}
while (true)
{
if (state & cpu_flag::memory)
{
if (auto& ptr = vm::g_tls_locked)
{
ptr->compare_and_swap(this, nullptr);
ptr = nullptr;
}
cpu_flag_memory = true;
state -= cpu_flag::memory;
}
if (state & (cpu_flag::exit + cpu_flag::jit_return + cpu_flag::dbg_global_stop))
{
state += cpu_flag::wait;
return true;
}
if (state & cpu_flag::signal && state.test_and_reset(cpu_flag::signal))
{
cpu_sleep_called = false;
}
const auto [state0, escape] = state.fetch_op([&](bs_t<cpu_flag>& flags)
{
// Atomically clean wait flag and escape
if (!(flags & (cpu_flag::exit + cpu_flag::jit_return + cpu_flag::dbg_global_stop + cpu_flag::ret + cpu_flag::stop)))
{
// Check pause flags which hold thread inside check_state
if (flags & (cpu_flag::pause + cpu_flag::suspend + cpu_flag::dbg_global_pause + cpu_flag::dbg_pause))
{
return false;
}
flags -= cpu_flag::wait;
}
return true;
});
if (escape)
{
if (cpu_flag_memory)
{
cpu_mem();
}
break;
}
else if (!cpu_sleep_called && state0 & cpu_flag::suspend)
{
cpu_sleep();
cpu_sleep_called = true;
continue;
}
if (state & cpu_flag::wait)
{
// Spin wait once for a bit before resorting to thread_ctrl::wait
for (u32 i = 0; i < 10; i++)
{
if (state0 & (cpu_flag::pause + cpu_flag::suspend))
{
busy_wait(500);
}
else
{
break;
}
}
if (!(state0 & (cpu_flag::pause + cpu_flag::suspend)))
{
continue;
}
}
if (state0 & (cpu_flag::suspend + cpu_flag::dbg_global_pause + cpu_flag::dbg_pause))
{
thread_ctrl::wait();
}
else
{
// If only cpu_flag::pause was set, notification won't arrive
g_cpu_suspend_lock.lock_unlock();
}
}
const auto state_ = state.load();
if (state_ & (cpu_flag::ret + cpu_flag::stop))
{
return true;
}
if (state_ & cpu_flag::dbg_step)
{
state += cpu_flag::dbg_pause;
state -= cpu_flag::dbg_step;
}
return false;
}
void cpu_thread::notify()
{
if (id_type() == 1)
{
thread_ctrl::notify(*static_cast<named_thread<ppu_thread>*>(this));
}
else if (id_type() == 2)
{
thread_ctrl::notify(*static_cast<named_thread<spu_thread>*>(this));
}
else
{
fmt::throw_exception("Invalid cpu_thread type");
}
}
std::string cpu_thread::dump() const
{
return fmt::format("Type: %s\n" "State: %s\n", typeid(*this).name(), state.load());
}
cpu_thread::suspend_all::suspend_all(cpu_thread* _this) noexcept
: m_this(_this)
{
if (m_this)
{
m_this->state += cpu_flag::wait;
}
g_cpu_suspend_lock.lock_vip();
for_all_cpu([](cpu_thread* cpu)
{
cpu->state += cpu_flag::pause;
});
busy_wait(500);
while (true)
{
bool ok = true;
for_all_cpu([&](cpu_thread* cpu)
{
if (!(cpu->state & cpu_flag::wait))
{
ok = false;
}
});
if (LIKELY(ok))
{
break;
}
busy_wait(500);
}
}
cpu_thread::suspend_all::~suspend_all()
{
// Make sure the latest thread does the cleanup and notifies others
if (g_cpu_suspend_lock.downgrade_unique_vip_lock_to_low_or_unlock())
{
for_all_cpu([&](cpu_thread* cpu)
{
cpu->state -= cpu_flag::pause;
});
g_cpu_suspend_lock.unlock_low();
}
else
{
g_cpu_suspend_lock.lock_unlock();
}
if (m_this)
{
m_this->check_state();
}
}