mirror of
https://github.com/alliedmodders/amxmodx.git
synced 2024-10-18 00:06:56 +03:00
103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
// vim: set sts=8 ts=2 sw=2 tw=99 et:
|
|
//
|
|
// Copyright (C) 2013, David Anderson and AlliedModders LLC
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright notice, this
|
|
// list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above copyright notice,
|
|
// this list of conditions and the following disclaimer in the documentation
|
|
// and/or other materials provided with the distribution.
|
|
// * Neither the name of AlliedModders LLC nor the names of its contributors
|
|
// may be used to endorse or promote products derived from this software
|
|
// without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
// POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
#ifndef _include_amtl_atomics_h_
|
|
#define _include_amtl_atomics_h_
|
|
|
|
#include <am-utility.h>
|
|
|
|
namespace ke {
|
|
|
|
#if defined(_MSC_VER)
|
|
extern "C" {
|
|
long __cdecl _InterlockedIncrement(long volatile *dest);
|
|
long __cdecl _InterlockedDecrement(long volatile *dest);
|
|
}
|
|
# pragma intrinsic(_InterlockedIncrement)
|
|
# pragma intrinsic(_InterlockedDecrement)
|
|
#endif
|
|
|
|
template <size_t Width>
|
|
struct AtomicOps;
|
|
|
|
template <>
|
|
struct AtomicOps<4>
|
|
{
|
|
#if defined(_MSC_VER)
|
|
typedef long Type;
|
|
|
|
static Type Increment(Type *ptr) {
|
|
return _InterlockedIncrement(ptr);
|
|
}
|
|
static Type Decrement(Type *ptr) {
|
|
return _InterlockedDecrement(ptr);
|
|
};
|
|
#elif defined(__GNUC__)
|
|
typedef int Type;
|
|
|
|
// x86/x64 notes: When using GCC < 4.8, this will compile to a spinlock.
|
|
// On 4.8+, or when using Clang, we'll get the more optimal "lock addl"
|
|
// variant.
|
|
static Type Increment(Type *ptr) {
|
|
return __sync_add_and_fetch(ptr, 1);
|
|
}
|
|
static Type Decrement(Type *ptr) {
|
|
return __sync_sub_and_fetch(ptr, 1);
|
|
}
|
|
#endif
|
|
};
|
|
|
|
class AtomicRefCount
|
|
{
|
|
typedef AtomicOps<sizeof(uintptr_t)> Ops;
|
|
|
|
public:
|
|
AtomicRefCount(uintptr_t value)
|
|
: value_(value)
|
|
{
|
|
}
|
|
|
|
void increment() {
|
|
Ops::Increment(&value_);
|
|
}
|
|
|
|
// Return false if all references are gone.
|
|
bool decrement() {
|
|
return Ops::Decrement(&value_) != 0;
|
|
}
|
|
|
|
private:
|
|
Ops::Type value_;
|
|
};
|
|
|
|
}
|
|
|
|
#endif // _include_amtl_atomics_h_
|
|
|