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Add a utility cache line size constant

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This commit is contained in:
Pedro J. Estébanez 2024-11-04 18:35:07 +01:00
parent 1bffd6c73b
commit 95c6a24795
2 changed files with 19 additions and 0 deletions
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1
SConstruct
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@ -851,6 +851,7 @@ if env.msvc and not methods.using_clang(env): # MSVC
"/wd4245",
"/wd4267",
"/wd4305", # C4305 (truncation): double to float or real_t, too hard to avoid.
"/wd4324", # C4820 (structure was padded due to alignment specifier)
"/wd4514", # C4514 (unreferenced inline function has been removed)
"/wd4714", # C4714 (function marked as __forceinline not inlined)
"/wd4820", # C4820 (padding added after construct)

18
core/os/thread.h
View File

@ -42,6 +42,8 @@
#include "core/templates/safe_refcount.h"
#include "core/typedefs.h"
#include <new>
#ifdef MINGW_ENABLED
#define MINGW_STDTHREAD_REDUNDANCY_WARNING
#include "thirdparty/mingw-std-threads/mingw.thread.h"
@ -85,6 +87,20 @@ public:
void (*term)() = nullptr;
};
#if defined(__cpp_lib_hardware_interference_size) && !defined(ANDROID_ENABLED) // This would be OK with NDK >= 26.
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Winterference-size"
#endif
static constexpr size_t CACHE_LINE_BYTES = std::hardware_destructive_interference_size;
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif
#else
// At a negligible memory cost, we use a conservatively high value.
static constexpr size_t CACHE_LINE_BYTES = 128;
#endif
private:
friend class Main;
@ -135,6 +151,8 @@ public:
typedef uint64_t ID;
static constexpr size_t CACHE_LINE_BYTES = sizeof(void *);
enum : ID {
UNASSIGNED_ID = 0,
MAIN_ID = 1