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Merge pull request #5161 from FEX-Emu/bylaws-patch-1

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WritePriorityMutex: Fix rare case of dropped read waiter wakes
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Ryan Houdek authored and GitHub committed 2025-12-27 15:12:09 -08:00
2 parents b41b967ba5 2edee2855c
commit ce9824a479
1 file changed
+6 -6
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FEXCore/Source/Utils/WritePriorityMutex.h
+6 -6
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@@ -353,14 +353,14 @@ private:
}
constexpr static uint32_t WRITE_OWNED_BIT = 1U << 31;
constexpr static uint32_t READ_WAITER_BIT = 1U << 15;
constexpr static uint32_t READ_WAITER_BIT = 1U << 30;
constexpr static uint32_t WRITE_WAITER_OFFSET = 16;
constexpr static uint32_t WRITE_WAITER_INCREMENT = 1U << WRITE_WAITER_OFFSET;
constexpr static uint32_t READ_OWNER_INCREMENT = 1;
// Count masks
constexpr static uint32_t WRITE_WAITER_COUNT_MASK = 0x7FFFU << WRITE_WAITER_OFFSET;
constexpr static uint32_t READ_OWNER_COUNT_MASK = 0x7FFFU;
constexpr static uint32_t WRITE_WAITER_COUNT_MASK = 0x3FFFU << WRITE_WAITER_OFFSET;
constexpr static uint32_t READ_OWNER_COUNT_MASK = 0xFFFFU;
// Independent futex bit-set masks.
// Wait for readers to drain.
@@ -373,9 +373,9 @@ private:
// Layout:
// Bits[31]: Write-lock bit.
// Bits[30:16]: Write-waiter count.
// Bits[15]: Read-waiter bit.
// Bits[14:0]: Read-owner count.
// Bits[30]: Read-waiter bit.
// Bits[29:16]: Write-waiter count.
// Bits[15:0]: Read-owner count.
uint32_t Futex {};
};
} // namespace FEXCore::Utils::WritePriorityMutex