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https://github.com/RPCSX/rpcsx.git
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c7fe8567b8
Enables trivial synchronization between shared mem. Reduces memory usage, but potentially degrades performance. Rename an overload of vm::passive_lock to vm::range_lock.
44 lines
1 KiB
C++
44 lines
1 KiB
C++
#pragma once
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#include "vm.h"
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#include "Utilities/cond.h"
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#include "util/atomic.hpp"
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namespace vm
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{
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// Get reservation status for further atomic update: last update timestamp
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inline atomic_t<u64>& reservation_acquire(u32 addr, u32 size)
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{
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// Access reservation info: stamp and the lock bit
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return *reinterpret_cast<atomic_t<u64>*>(g_reservations + (addr & 0xff80) / 2);
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}
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// Update reservation status
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inline void reservation_update(u32 addr, u32 size, bool lsb = false)
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{
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// Update reservation info with new timestamp
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reservation_acquire(addr, size) += 128;
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}
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// Get reservation sync variable
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inline atomic_t<u64>& reservation_notifier(u32 addr, u32 size)
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{
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return *reinterpret_cast<atomic_t<u64>*>(g_reservations + (addr & 0xff80) / 2);
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}
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void reservation_lock_internal(atomic_t<u64>&);
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inline atomic_t<u64>& reservation_lock(u32 addr, u32 size)
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{
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auto& res = vm::reservation_acquire(addr, size);
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if (res.bts(0)) [[unlikely]]
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{
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reservation_lock_internal(res);
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}
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return res;
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}
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} // namespace vm
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