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atomic.hpp: reimplement USE_FUTEX path for Linux

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This commit is contained in:
Nekotekina 2019-10-20 18:19:54 +03:00
parent e0f60c5dce
commit 56b310ebac
1 changed files with 40 additions and 6 deletions
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46
rpcs3/util/atomic.cpp
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@ -1,10 +1,7 @@
#include "atomic.hpp"
// USE_FUTEX takes precedence over USE_POSIX
#ifdef __linux__
#define USE_FUTEX
#define USE_POSIX
#endif
#include "Utilities/sync.h"
@ -154,6 +151,14 @@ static constexpr u64 s_sema_mask = (s_sema_gcount * 64 - 1);
#ifdef USE_POSIX
using sema_handle = sem_t;
#elif defined(USE_FUTEX)
namespace
{
struct alignas(64) sema_handle
{
atomic_t<u32> sema;
};
}
#elif defined(_WIN32)
using sema_handle = std::uint16_t;
#else
@ -214,7 +219,7 @@ static u32 sema_alloc()
#ifdef USE_POSIX
// Initialize semaphore (should be very fast)
sem_init(&s_sema_list[id], 0, 0);
#elif defined(_WIN32)
#elif defined(_WIN32) | defined(USE_FUTEX)
// Do nothing
#else
if (!s_sema_list[id])
@ -485,7 +490,25 @@ void atomic_storage_futex::wait(const void* data, std::size_t size, u64 old_valu
if (sema_id && ptr_cmp(data, size, old_value, mask) && s_tls_wait_cb(data))
{
#if defined(_WIN32) && !defined(USE_POSIX)
#ifdef USE_FUTEX
struct timespec ts;
ts.tv_sec = timeout / 1'000'000'000;
ts.tv_nsec = timeout % 1'000'000'000;
if (s_sema_list[sema_id].sema.try_dec(0))
{
fallback = true;
}
else
{
futex(&s_sema_list[sema_id].sema, FUTEX_WAIT_PRIVATE, 0, timeout + 1 ? &ts : nullptr);
if (s_sema_list[sema_id].sema.try_dec(0))
{
fallback = true;
}
}
#elif defined(_WIN32) && !defined(USE_POSIX)
LARGE_INTEGER qw;
qw.QuadPart = -static_cast<s64>(timeout / 100);
@ -591,7 +614,12 @@ void atomic_storage_futex::wait(const void* data, std::size_t size, u64 old_valu
break;
}
#if defined(_WIN32) && !defined(USE_POSIX)
#ifdef USE_FUTEX
if (s_sema_list[sema_id].sema.try_dec(0))
{
fallback = true;
}
#elif defined(_WIN32) && !defined(USE_POSIX)
static LARGE_INTEGER instant{};
if (!NtWaitForKeyedEvent(nullptr, &s_sema_list[sema_id], false, &instant))
@ -727,6 +755,9 @@ void atomic_storage_futex::notify_one(const void* data)
{
#ifdef USE_POSIX
sem_post(&s_sema_list[sema_id]);
#elif defined(USE_FUTEX)
s_sema_list[sema_id].sema++;
futex(&s_sema_list[sema_id].sema, FUTEX_WAKE_PRIVATE, 1);
#elif defined(_WIN32)
NtReleaseKeyedEvent(nullptr, &s_sema_list[sema_id], 1, nullptr);
#else
@ -782,6 +813,9 @@ void atomic_storage_futex::notify_all(const void* data)
{
sem_post(&s_sema_list[sema_id]);
}
#elif defined(USE_FUTEX)
s_sema_list[sema_id].sema += count;
futex(&s_sema_list[sema_id].sema, FUTEX_WAKE_PRIVATE, 0x7fff'ffff);
#elif defined(_WIN32)
for (u32 i = 0; i < count; i++)
{