MacOS does not support an equivalent of MAP_FIXED_NOREPLACE via mmap(),
which means that our usage for allocating PCSX2's memory map is not
thread-safe.
All games use mailbox/triple buffering. Except when you enable sync to
host refresh, in which case FIFO/double buffering is used.
This means vsync enabled will ever tear, but at the same time, never
drop to 30fps on a missed frame due to frame rate differences.
To have the "best of both worlds", you should enable vsync and sync to
host refresh. Previously, this resulted in additional input lag, since
the host vsync would drive the EE frame timing. Now, this behaviour is
disabled by default, unless you enable "Use Host VSync Timing".
MAP_FIXED will clobber any existing memory mapping, and is not safe
to use in a multi-threaded environment. Whether we like it or not,
we are a multi-threaded environment, because Qt initializes before
we get to main(), so it's already too late to safely use MAP_FIXED
by the time we get there.
Use MAP_FIXED_NOREPLACE instead. This is how MAP_FIXED should have
behaved from the beginning.
Obviously this means you'll need Linux 4.17+ and a semi-recent libc
to use PCSX2 now. But if you're running a 6 year old unsupported
kernel, you have bigger problems.
Fixes "random" startup crashes.
Guest memory is now mapped into a shared memory/file mapping, for use
with fastmem.
64-bit and 128-bit arguments are passed by register/value instead of by
reference/address.
LDL/LDR/SDL/SDR now use 64-bit GPRs instead of SSE.
* common: format AlignedMalloc.cpp
* common: format AppTrait.h
* common: format Assertions.h
* common: format CheckedStaticBox
* common: format Console
* common: format Dependencies.h
* common: format EmbeddedImage
* common: format EventSource
* common: format Exceptions
* common: format FastFormatString.cpp
* common: format General.h
* common: format InitInterface
* common: format MathUtils.h
* common: format MemsetFast/MemcpyFast
* common: format Mutex.cpp
* common: format PageFaultSource.h
* common: format Path.h
* common: format PathUtils.cpp
* common: format Pcsx2Types.h
* common: format Perf
* common: format PersistentThread.h
* common: format RwMutex
* common: format SafeArray
* common: format ScopedAlloc.h
* common: format ScopedPtrMT.h
* common: format Semaphore.cpp
* common: format StringHelpers
* common: format ThreadTools.cpp
* common: format Threading.h
* common: format ThreadingDialogs
* common: format ThreadingInternal.h
* common: format TraceLog.h
* common: format VirtualMemory.cpp
* common: format pxCheckBox
* common: format pxEvents.h
* common: format pxForwardDefs.h
* common: format pxRadioPanel
* common: format pxStaticText
* common: format pxStreams
* common: format pxTranslate.cpp
* common: format pxWindowTextWriter.cpp
* common: format wxAppWithHelpers
* common: format wxBaseTools.h
* common: format wxGuiTools
* common: format wxHelpers.cpp
* common: format Darwin directory
* common: format Linux directory
* common: format Windows directory
* common: format LnxCpuDetect.cpp
* common: format WinCpuDetect.cpp
* common: format bmi.cpp
* common: format cpudetect.cpp
* common: format cpu_detect_internal.h
* common: format fpu.cpp
* common: format groups.cpp
* common: format instructions.h
* common: format internal.h
* common: format jmp.cpp
* common: format legacy.cpp
* common: format legacy_instructions.h
* common: format legacy_internal.h
* common: format movs.cpp
* common: format simd.cpp
* common: format tools.h
* common: format x86emitter.cpp
* common: format x86types.h
* common: format bmi.h
* common: format dwshift.h
* common: format group1.h group2.h group3.h
* common: format incdec.h
* common: format jmpcall.h
* common: format movs.h
* common: format simd_arithmetic.h
* common: format simd_comparisons.h
* common: format simd_helpers.h
* common: format simd_moremovs.h
* common: format simd_shufflepack.h
* common: format simd_templated_helpers.h
* common: format test.h
