jeanlemotan
227 lines
6.5 KiB
C++
227 lines
6.5 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Copyright (c) Electronic Arts Inc. All rights reserved.
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///////////////////////////////////////////////////////////////////////////////
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#if defined(EA_PRAGMA_ONCE_SUPPORTED)
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#pragma once // Some compilers (e.g. VC++) benefit significantly from using this. We've measured 3-4% build speed improvements in apps as a result.
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#endif
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#ifndef EATHREAD_GCC_EATHREAD_ATOMIC_ANDROID_H
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#define EATHREAD_GCC_EATHREAD_ATOMIC_ANDROID_H
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#include <EABase/eabase.h>
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#include <stddef.h>
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#include <sys/atomics.h>
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#include <eathread/internal/eathread_atomic_standalone.h>
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#define EA_THREAD_ATOMIC_IMPLEMENTED
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namespace EA
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{
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namespace Thread
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{
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/// android_fake_atomics_*
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///
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int64_t android_fake_atomic_swap_64(int64_t value, volatile int64_t* addr);
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int android_fake_atomic_cmpxchg_64(int64_t oldvalue, int64_t newvalue, volatile int64_t* addr);
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int64_t android_fake_atomic_read_64(volatile int64_t* addr);
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/// class AtomicInt
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/// Actual implementation may vary per platform. May require certain alignments, sizes,
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/// and declaration specifications per platform.
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template <class T>
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class AtomicInt
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{
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public:
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typedef AtomicInt<T> ThisType;
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typedef T ValueType;
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/// AtomicInt
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/// Empty constructor. Intentionally leaves mValue in an unspecified state.
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/// This is done so that an AtomicInt acts like a standard built-in integer.
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AtomicInt()
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{}
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AtomicInt(ValueType n)
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{ SetValue(n); }
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AtomicInt(const ThisType& x)
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: mValue(x.GetValue()) {}
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AtomicInt& operator=(const ThisType& x)
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{ mValue = x.GetValue(); return *this; }
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ValueType GetValue() const
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{ return mValue; }
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ValueType GetValueRaw() const
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{ return mValue; }
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ValueType SetValue(ValueType n);
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bool SetValueConditional(ValueType n, ValueType condition);
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ValueType Increment();
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ValueType Decrement();
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ValueType Add(ValueType n);
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// operators
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inline operator const ValueType() const { return GetValue(); }
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inline ValueType operator =(ValueType n) { SetValue(n); return n; }
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inline ValueType operator+=(ValueType n) { return Add(n);}
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inline ValueType operator-=(ValueType n) { return Add(-n);}
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inline ValueType operator++() { return Increment();}
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inline ValueType operator++(int) { return Increment() - 1;}
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inline ValueType operator--() { return Decrement(); }
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inline ValueType operator--(int) { return Decrement() + 1;}
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protected:
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volatile ValueType mValue;
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};
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template <> inline
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AtomicInt<int32_t>::ValueType AtomicInt<int32_t>::SetValue(ValueType n)
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{ return __atomic_swap(n, &mValue); }
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template <> inline
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AtomicInt<uint32_t>::ValueType AtomicInt<uint32_t>::SetValue(ValueType n)
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{ return __atomic_swap(n, (volatile int*)&mValue); }
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template <> inline
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bool AtomicInt<int32_t>::SetValueConditional(ValueType n, ValueType condition)
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{ return (__atomic_cmpxchg(condition, n, &mValue) == 0); }
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template <> inline
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bool AtomicInt<uint32_t>::SetValueConditional(ValueType n, ValueType condition)
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{ return (__atomic_cmpxchg(condition, n, (volatile int*)&mValue) == 0); }
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template <> inline
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AtomicInt<int32_t>::ValueType AtomicInt<int32_t>::Increment()
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{ return __atomic_inc(&mValue) + 1; }
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template <> inline
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AtomicInt<uint32_t>::ValueType AtomicInt<uint32_t>::Increment()
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{ return __atomic_inc((volatile int*)&mValue) + 1; }
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template <> inline
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AtomicInt<int32_t>::ValueType AtomicInt<int32_t>::Decrement()
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{ return __atomic_dec(&mValue) - 1; }
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template <> inline
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AtomicInt<uint32_t>::ValueType AtomicInt<uint32_t>::Decrement()
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{ return __atomic_dec((volatile int*)&mValue) - 1; }
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template <> inline
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AtomicInt<int32_t>::ValueType AtomicInt<int32_t>::Add(ValueType n)
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{
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// http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Atomic-Builtins.html
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return __sync_add_and_fetch(&mValue, n);
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}
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template <> inline
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AtomicInt<uint32_t>::ValueType AtomicInt<uint32_t>::Add(ValueType n)
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{
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// http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Atomic-Builtins.html
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return __sync_add_and_fetch(&mValue, n);
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}
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///////////////////////////////////////////////////////////
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/// 64 bit, simulated
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///
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template <> inline
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AtomicInt<int64_t>::ValueType AtomicInt<int64_t>::GetValue() const
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{ return android_fake_atomic_read_64((volatile int64_t*)&mValue); }
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template <> inline
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AtomicInt<uint64_t>::ValueType AtomicInt<uint64_t>::GetValue() const
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{ return android_fake_atomic_read_64((volatile int64_t*)&mValue); }
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template <> inline
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AtomicInt<int64_t>::ValueType AtomicInt<int64_t>::SetValue(ValueType n)
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{
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const ValueType nOldValue(mValue);
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android_fake_atomic_swap_64((int64_t)n, (volatile int64_t*)&mValue);
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return nOldValue;
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}
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template <> inline
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AtomicInt<uint64_t>::ValueType AtomicInt<uint64_t>::SetValue(ValueType n)
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{
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const ValueType nOldValue(mValue);
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android_fake_atomic_swap_64((int64_t)n, (volatile int64_t*)&mValue);
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return nOldValue;
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}
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template <> inline
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bool AtomicInt<int64_t>::SetValueConditional(ValueType n, ValueType condition)
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{
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return android_fake_atomic_cmpxchg_64(condition, n, (volatile int64_t*)&mValue) == 0;
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}
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template <> inline
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bool AtomicInt<uint64_t>::SetValueConditional(ValueType n, ValueType condition)
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{
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return android_fake_atomic_cmpxchg_64(condition, n, (volatile int64_t*)&mValue) == 0;
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}
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template <> inline
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AtomicInt<int64_t>::ValueType AtomicInt<int64_t>::Add(ValueType n)
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{
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int64_t old;
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do {
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old = mValue;
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}
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while (android_fake_atomic_cmpxchg_64((int64_t)old, (int64_t)old+n, (volatile int64_t*)&mValue) != 0);
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return mValue;
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}
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template <> inline
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AtomicInt<uint64_t>::ValueType AtomicInt<uint64_t>::Add(ValueType n)
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{
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uint64_t old;
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do {
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old = mValue;
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}
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while (android_fake_atomic_cmpxchg_64((int64_t)old, (int64_t)old+n, (volatile int64_t*)&mValue) != 0);
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return mValue;
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}
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template <> inline
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AtomicInt<int64_t>::ValueType AtomicInt<int64_t>::Increment()
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{ return Add(1); }
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template <> inline
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AtomicInt<uint64_t>::ValueType AtomicInt<uint64_t>::Increment()
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{ return Add(1); }
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template <> inline
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AtomicInt<int64_t>::ValueType AtomicInt<int64_t>::Decrement()
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{ return Add(-1); }
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template <> inline
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AtomicInt<uint64_t>::ValueType AtomicInt<uint64_t>::Decrement()
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{ return Add(-1); }
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} // namespace Thread
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} // namespace EA
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#endif // EATHREAD_GCC_EATHREAD_ATOMIC_ANDROID_H
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