From 7ee008e150bc5bcf76082d726f719ee0fdfda982 Mon Sep 17 00:00:00 2001
From: SulfurNitride <SulfurNitride@users.noreply.github.com>
Date: Wed, 11 Feb 2026 02:37:39 -0600
Subject: Fluorine Manager: full Linux port of Mod Organizer 2

Complete native Linux port with FUSE-based virtual filesystem,
Proton/umu-run integration, and Flatpak packaging.

Key features:
- FUSE VFS replacing Windows USVFS (in-process + standalone helper for Flatpak)
- Proton/GE-Proton/umu-run launcher with env var forwarding
- Flatpak support (sandbox-aware VFS, NXM handler, umu-run)
- Wine prefix management UI
- Case-insensitive path resolution for Linux filesystems
- QSettings-safe INI handling (avoids Bethesda INI corruption)
- Portable instance support with auto-generated launcher scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 libs/usvfs/src/usvfs_dll/semaphore.cpp | 57 ++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 libs/usvfs/src/usvfs_dll/semaphore.cpp

(limited to 'libs/usvfs/src/usvfs_dll/semaphore.cpp')

diff --git a/libs/usvfs/src/usvfs_dll/semaphore.cpp b/libs/usvfs/src/usvfs_dll/semaphore.cpp
new file mode 100644
index 0000000..609b2f5
--- /dev/null
+++ b/libs/usvfs/src/usvfs_dll/semaphore.cpp
@@ -0,0 +1,57 @@
+#include "semaphore.h"
+#include "exceptionex.h"
+
+RecursiveBenaphore::RecursiveBenaphore() : m_Counter(0), m_OwnerId(0UL), m_Recursion(0)
+{
+  m_Semaphore = ::CreateSemaphore(nullptr, 1, 1, nullptr);
+}
+
+RecursiveBenaphore::~RecursiveBenaphore()
+{
+  ::CloseHandle(m_Semaphore);
+}
+
+void RecursiveBenaphore::wait(DWORD timeout)
+{
+  DWORD tid = ::GetCurrentThreadId();
+
+  if (::_InterlockedIncrement(&m_Counter) > 1) {
+    if (tid != m_OwnerId) {
+      int tries = 3;
+      while (::WaitForSingleObject(m_Semaphore, timeout) != WAIT_OBJECT_0) {
+        HANDLE owner = ::OpenThread(SYNCHRONIZE, FALSE, m_OwnerId);
+        ON_BLOCK_EXIT([owner]() {
+          ::CloseHandle(owner);
+        });
+        if ((tries <= 0) || (::WaitForSingleObject(owner, 0) == WAIT_OBJECT_0)) {
+          // owner has quit without releasing the semaphore!
+          m_Recursion = 0;
+          spdlog::get("usvfs")->error("thread {} never released the mutex", m_OwnerId);
+          break;
+        } else {
+          --tries;
+        }
+      }
+    }
+  }
+  m_OwnerId = tid;
+  ++m_Recursion;
+}
+
+void RecursiveBenaphore::signal()
+{
+  if (m_Recursion == 0) {
+    return;
+  }
+  // no validation the signaling thread is the one owning the lock
+  DWORD recursion = --m_Recursion;
+  if (recursion == 0) {
+    m_OwnerId = 0;
+  }
+  DWORD result = ::_InterlockedDecrement(&m_Counter);
+  if (result > 0) {
+    if (recursion == 0) {
+      ::ReleaseSemaphore(m_Semaphore, 1, nullptr);
+    }
+  }
+}
-- 
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