mirror of https://github.com/PCSX2/pcsx2.git
280 lines
7.5 KiB
C++
280 lines
7.5 KiB
C++
// SPDX-FileCopyrightText: 2002-2024 PCSX2 Dev Team
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// SPDX-License-Identifier: LGPL-3.0+
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#include "common/Threading.h"
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#include "common/Assertions.h"
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#include <cstdio>
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#include <cassert> // assert
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#include <sched.h>
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#include <sys/time.h> // gettimeofday()
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#include <pthread.h>
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#include <unistd.h>
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#include <mach/mach.h>
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#include <mach/mach_error.h> // mach_error_string()
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#include <mach/mach_init.h>
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#include <mach/mach_port.h>
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#include <mach/mach_time.h> // mach_absolute_time()
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#include <mach/semaphore.h> // semaphore_*()
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#include <mach/task.h> // semaphore_create() and semaphore_destroy()
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#include <mach/thread_act.h>
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// Note: assuming multicore is safer because it forces the interlocked routines to use
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// the LOCK prefix. The prefix works on single core CPUs fine (but is slow), but not
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// having the LOCK prefix is very bad indeed.
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__forceinline void Threading::Timeslice()
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{
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sched_yield();
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}
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// For use in spin/wait loops, acts as a hint to Intel CPUs and should, in theory
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// improve performance and reduce cpu power consumption.
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__forceinline void Threading::SpinWait()
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{
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// If this doesn't compile you can just comment it out (it only serves as a
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// performance hint and isn't required).
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#if defined(_M_X86)
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__asm__("pause");
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#elif defined(_M_ARM64)
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__asm__ __volatile__("isb");
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#endif
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}
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__forceinline void Threading::EnableHiresScheduler()
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{
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// Darwin has customizable schedulers, see xnu/osfmk/man. Not
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// implemented yet though (and not sure if useful for pcsx2).
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}
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__forceinline void Threading::DisableHiresScheduler()
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{
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// see EnableHiresScheduler()
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}
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// Just like on Windows, this is not really the number of ticks per second,
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// but just a factor by which one has to divide GetThreadCpuTime() or
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// pxThread::GetCpuTime() if one wants to receive a value in seconds. NOTE:
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// doing this will of course yield precision loss.
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u64 Threading::GetThreadTicksPerSecond()
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{
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return 1000000; // the *CpuTime() functions return values in microseconds
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}
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// gets the CPU time used by the current thread (both system and user), in
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// microseconds, returns 0 on failure
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static u64 getthreadtime(thread_port_t thread)
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{
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mach_msg_type_number_t count = THREAD_BASIC_INFO_COUNT;
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thread_basic_info_data_t info;
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kern_return_t kr = thread_info(thread, THREAD_BASIC_INFO,
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(thread_info_t)&info, &count);
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if (kr != KERN_SUCCESS)
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{
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return 0;
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}
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// add system and user time
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return (u64)info.user_time.seconds * (u64)1e6 +
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(u64)info.user_time.microseconds +
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(u64)info.system_time.seconds * (u64)1e6 +
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(u64)info.system_time.microseconds;
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}
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// Returns the current timestamp (not relative to a real world clock) in microseconds
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u64 Threading::GetThreadCpuTime()
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{
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// we could also use mach_thread_self() and mach_port_deallocate(), but
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// that calls upon mach traps (kinda like system calls). Unless I missed
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// something in the COMMPAGE (like Linux vDSO) which makes overrides it
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// to be user-space instead. In contract,
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// pthread_mach_thread_np(pthread_self()) is entirely in user-space.
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u64 us = getthreadtime(pthread_mach_thread_np(pthread_self()));
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return us;
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}
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// --------------------------------------------------------------------------------------
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// Semaphore Implementation for Darwin/OSX
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//
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// Sadly, Darwin/OSX needs its own implementation of Semaphores instead of
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// relying on phtreads, because OSX unnamed semaphore (the best kind)
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// support is very poor.
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//
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// This implementation makes use of Mach primitives instead. These are also
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// what Grand Central Dispatch (GCD) is based on, as far as I understand:
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// http://newosxbook.com/articles/GCD.html.
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//
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// --------------------------------------------------------------------------------------
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static void MACH_CHECK(kern_return_t mach_retval)
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{
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if (mach_retval != KERN_SUCCESS)
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{
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fprintf(stderr, "mach error: %s", mach_error_string(mach_retval));
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assert(mach_retval == KERN_SUCCESS);
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}
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}
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Threading::KernelSemaphore::KernelSemaphore()
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{
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MACH_CHECK(semaphore_create(mach_task_self(), &m_sema, SYNC_POLICY_FIFO, 0));
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}
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Threading::KernelSemaphore::~KernelSemaphore()
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{
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MACH_CHECK(semaphore_destroy(mach_task_self(), m_sema));
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}
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void Threading::KernelSemaphore::Post()
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{
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MACH_CHECK(semaphore_signal(m_sema));
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}
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void Threading::KernelSemaphore::Wait()
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{
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MACH_CHECK(semaphore_wait(m_sema));
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}
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bool Threading::KernelSemaphore::TryWait()
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{
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mach_timespec_t time = {};
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kern_return_t res = semaphore_timedwait(m_sema, time);
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if (res == KERN_OPERATION_TIMED_OUT)
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return false;
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MACH_CHECK(res);
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return true;
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}
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Threading::ThreadHandle::ThreadHandle() = default;
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Threading::ThreadHandle::ThreadHandle(const ThreadHandle& handle)
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: m_native_handle(handle.m_native_handle)
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{
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}
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Threading::ThreadHandle::ThreadHandle(ThreadHandle&& handle)
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: m_native_handle(handle.m_native_handle)
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{
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handle.m_native_handle = nullptr;
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}
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Threading::ThreadHandle::~ThreadHandle() = default;
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Threading::ThreadHandle Threading::ThreadHandle::GetForCallingThread()
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{
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ThreadHandle ret;
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ret.m_native_handle = pthread_self();
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return ret;
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}
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Threading::ThreadHandle& Threading::ThreadHandle::operator=(ThreadHandle&& handle)
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{
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m_native_handle = handle.m_native_handle;
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handle.m_native_handle = nullptr;
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return *this;
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}
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Threading::ThreadHandle& Threading::ThreadHandle::operator=(const ThreadHandle& handle)
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{
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m_native_handle = handle.m_native_handle;
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return *this;
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}
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u64 Threading::ThreadHandle::GetCPUTime() const
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{
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return getthreadtime(pthread_mach_thread_np((pthread_t)m_native_handle));
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}
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bool Threading::ThreadHandle::SetAffinity(u64 processor_mask) const
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{
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// Doesn't appear to be possible to set affinity.
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return false;
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}
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Threading::Thread::Thread() = default;
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Threading::Thread::Thread(Thread&& thread)
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: ThreadHandle(thread)
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, m_stack_size(thread.m_stack_size)
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{
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thread.m_stack_size = 0;
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}
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Threading::Thread::Thread(EntryPoint func)
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: ThreadHandle()
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{
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if (!Start(std::move(func)))
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pxFailRel("Failed to start implicitly started thread.");
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}
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Threading::Thread::~Thread()
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{
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pxAssertRel(!m_native_handle, "Thread should be detached or joined at destruction");
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}
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void Threading::Thread::SetStackSize(u32 size)
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{
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pxAssertRel(!m_native_handle, "Can't change the stack size on a started thread");
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m_stack_size = size;
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}
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void* Threading::Thread::ThreadProc(void* param)
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{
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std::unique_ptr<EntryPoint> entry(static_cast<EntryPoint*>(param));
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(*entry.get())();
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return nullptr;
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}
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bool Threading::Thread::Start(EntryPoint func)
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{
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pxAssertRel(!m_native_handle, "Can't start an already-started thread");
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std::unique_ptr<EntryPoint> func_clone(std::make_unique<EntryPoint>(std::move(func)));
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pthread_attr_t attrs;
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bool has_attributes = false;
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if (m_stack_size != 0)
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{
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has_attributes = true;
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pthread_attr_init(&attrs);
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}
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if (m_stack_size != 0)
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pthread_attr_setstacksize(&attrs, m_stack_size);
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pthread_t handle;
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const int res = pthread_create(&handle, has_attributes ? &attrs : nullptr, ThreadProc, func_clone.get());
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if (res != 0)
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return false;
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// thread started, it'll release the memory
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m_native_handle = (void*)handle;
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func_clone.release();
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return true;
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}
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void Threading::Thread::Detach()
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{
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pxAssertRel(m_native_handle, "Can't detach without a thread");
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pthread_detach((pthread_t)m_native_handle);
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m_native_handle = nullptr;
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}
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void Threading::Thread::Join()
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{
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pxAssertRel(m_native_handle, "Can't join without a thread");
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void* retval;
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const int res = pthread_join((pthread_t)m_native_handle, &retval);
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if (res != 0)
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pxFailRel("pthread_join() for thread join failed");
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m_native_handle = nullptr;
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}
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// name can be up to 16 bytes
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void Threading::SetNameOfCurrentThread(const char* name)
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{
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pthread_setname_np(name);
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}
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