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106 lines
2.5 KiB
C++
106 lines
2.5 KiB
C++
// This code is in the public domain -- castanyo@yahoo.es
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#pragma once
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#ifndef NV_THREAD_H
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#define NV_THREAD_H
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#include "nvcore/nvcore.h"
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// Function linkage
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#if NVTHREAD_SHARED
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#ifdef NVTHREAD_EXPORTS
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#define NVTHREAD_API DLL_EXPORT
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#define NVTHREAD_CLASS DLL_EXPORT_CLASS
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#else
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#define NVTHREAD_API DLL_IMPORT
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#define NVTHREAD_CLASS DLL_IMPORT
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#endif
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#else // NVMATH_SHARED
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#define NVTHREAD_API
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#define NVTHREAD_CLASS
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#endif // NVMATH_SHARED
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// Compiler barriers.
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// See: http://en.wikipedia.org/wiki/Memory_ordering
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#if NV_CC_MSVC
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#include <intrin.h>
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#pragma intrinsic(_WriteBarrier)
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#define nvCompilerWriteBarrier _WriteBarrier
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#pragma intrinsic(_ReadWriteBarrier)
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#define nvCompilerReadWriteBarrier _ReadWriteBarrier
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#if _MSC_VER >= 1400 // ReadBarrier is VC2005
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#pragma intrinsic(_ReadBarrier)
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#define nvCompilerReadBarrier _ReadBarrier
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#else
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#define nvCompilerReadBarrier _ReadWriteBarrier
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#endif
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#elif NV_CC_GNUC
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#define nvCompilerReadWriteBarrier() asm volatile("" ::: "memory");
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#define nvCompilerWriteBarrier nvCompilerReadWriteBarrier
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#define nvCompilerReadBarrier nvCompilerReadWriteBarrier
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#elif NV_CC_CLANG && NV_CPU_ARM
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// thanks to Autor Artur Bac for
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inline void sync_synchronize() { asm volatile( "dmb;"); }
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/* this is not yet supported by LLVM 2.1 but it is planned
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#define nvCompilerReadWriteBarrier() MemoryFence()
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*/
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// JBeilin: from what i read this should do the trick for ARM
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// however this might also be wrong and dumb.
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//#define nvCompilerReadWriteBarrier() asm volatile( "dmb;");
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#define nvCompilerReadWriteBarrier() nvCompilerReadWriteBarrier()
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#define nvCompilerWriteBarrier nvCompilerReadWriteBarrier
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#define nvCompilerReadBarrier nvCompilerReadWriteBarrier
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#endif // NV_CC_MSVC
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// @@ Memory barriers / fences.
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// @@ Atomics.
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/* Wrap this up:
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#define YieldProcessor() __asm { rep nop }
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#define YieldProcessor _mm_pause
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#define YieldProcessor __yield
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BOOL WINAPI SwitchToThread(void);
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*/
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namespace nv
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{
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//void initThreadingSystemInfo();
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// Reentrant.
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uint processorCount();
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uint logicalProcessorCount();
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uint physicalProcessorCount();
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// Locks the current thread to the given logical processor index.
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void lockThreadToProcessor(int idx);
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void unlockThreadToProcessor();
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uint threadId();
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} // nv namespace
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#endif // NV_THREAD_H
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