threads.h

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// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
// Modified by Jeremy Retailleau.
 
#ifndef PXR_ARCH_THREADS_H
#define PXR_ARCH_THREADS_H

 
#include "pxr/arch/pxr.h"
#include "pxr/arch/api.h"
#include "pxr/arch/defines.h"
 
// Needed for ARCH_SPIN_PAUSE on Windows in builds with precompiled
// headers disabled.
#ifdef ARCH_COMPILER_MSVC
#include <intrin.h>
#endif
 
#include <thread>
 
ARCH_NAMESPACE_OPEN_SCOPE

ARCH_API bool ArchIsMainThread();

ARCH_API std::thread::id ArchGetMainThreadId();

#if defined(ARCH_CPU_INTEL)
#if defined(ARCH_COMPILER_GCC) || defined(ARCH_COMPILER_CLANG)
#define ARCH_SPIN_PAUSE() __builtin_ia32_pause()
#elif defined(ARCH_COMPILER_MSVC)
#define ARCH_SPIN_PAUSE() _mm_pause()
#endif
#elif defined(ARCH_CPU_ARM)
#if defined(ARCH_COMPILER_GCC) || defined(ARCH_COMPILER_CLANG)
#define ARCH_SPIN_PAUSE() asm volatile ("yield" ::: "memory")
#elif defined(ARCH_COMPILER_MSVC)
#define ARCH_SPIN_PAUSE() __yield();
#endif
#else
#define ARCH_SPIN_PAUSE()
#endif
 
ARCH_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_ARCH_THREADS_H