diff --git a/rpcs3/Emu/SysCalls/Modules/cellSync.cpp b/rpcs3/Emu/SysCalls/Modules/cellSync.cpp
index e66b8a4f3a..604aab4902 100644
--- a/rpcs3/Emu/SysCalls/Modules/cellSync.cpp
+++ b/rpcs3/Emu/SysCalls/Modules/cellSync.cpp
@@ -4,51 +4,17 @@
 #include "Emu/System.h"
 #include "Emu/SysCalls/Modules.h"
 
+#include "cellSync.h"
+
 //void cellSync_init();
 //Module cellSync("cellSync", cellSync_init);
 Module *cellSync = nullptr;
 
-// Return Codes
-enum
-{
-	CELL_SYNC_ERROR_AGAIN                  = 0x80410101,
-	CELL_SYNC_ERROR_INVAL                  = 0x80410102,
-	CELL_SYNC_ERROR_NOMEM                  = 0x80410104,
-	CELL_SYNC_ERROR_DEADLK                 = 0x80410108,
-	CELL_SYNC_ERROR_PERM                   = 0x80410109,
-	CELL_SYNC_ERROR_BUSY                   = 0x8041010A,
-	CELL_SYNC_ERROR_STAT                   = 0x8041010F,
-	CELL_SYNC_ERROR_ALIGN                  = 0x80410110,
-	CELL_SYNC_ERROR_NULL_POINTER           = 0x80410111,
-	CELL_SYNC_ERROR_NOT_SUPPORTED_THREAD   = 0x80410112,
-	CELL_SYNC_ERROR_NO_NOTIFIER            = 0x80410113,
-	CELL_SYNC_ERROR_NO_SPU_CONTEXT_STORAGE = 0x80410114,
-};
-
-struct CellSyncMutex
-{
-	be_t<u16> m_freed;
-	be_t<u16> m_order;
-
-	volatile u32& m_data()
-	{
-		return *reinterpret_cast<u32*>(this);
-	};
-	/*
-	(???) Initialize: set zeros
-	(???) Lock: increase m_order and wait until m_freed == old m_order
-	(???) Unlock: increase m_freed
-	(???) TryLock: ?????
-	*/
-};
-
-static_assert(sizeof(CellSyncMutex) == 4, "CellSyncMutex: wrong sizeof");
-
 int cellSyncMutexInitialize(mem_ptr_t<CellSyncMutex> mutex)
 {
 	cellSync->Log("cellSyncMutexInitialize(mutex=0x%x)", mutex.GetAddr());
 
-	if (!mutex.IsGood())
+	if (!mutex)
 	{
 		return CELL_SYNC_ERROR_NULL_POINTER;
 	}
@@ -57,7 +23,8 @@ int cellSyncMutexInitialize(mem_ptr_t<CellSyncMutex> mutex)
 		return CELL_SYNC_ERROR_ALIGN;
 	}
 
-	mutex->m_data() = 0;
+	// prx: set zero and sync
+	InterlockedExchange(&mutex->m_data(), 0);
 	return CELL_OK;
 }
 
@@ -65,7 +32,7 @@ int cellSyncMutexLock(mem_ptr_t<CellSyncMutex> mutex)
 {
 	cellSync->Log("cellSyncMutexLock(mutex=0x%x)", mutex.GetAddr());
 
-	if (!mutex.IsGood())
+	if (!mutex)
 	{
 		return CELL_SYNC_ERROR_NULL_POINTER;
 	}
@@ -74,6 +41,7 @@ int cellSyncMutexLock(mem_ptr_t<CellSyncMutex> mutex)
 		return CELL_SYNC_ERROR_ALIGN;
 	}
 
+	// prx: increase u16 and remember its old value
 	be_t<u16> old_order;
 	while (true)
 	{
@@ -82,11 +50,12 @@ int cellSyncMutexLock(mem_ptr_t<CellSyncMutex> mutex)
 		new_mutex.m_data() = old_data;
 
 		old_order = new_mutex.m_order;
-		new_mutex.m_order++;
+		new_mutex.m_order++; // increase m_order
 		if (InterlockedCompareExchange(&mutex->m_data(), new_mutex.m_data(), old_data) == old_data) break;
 	}
 
-	while (old_order != mutex->m_freed) 
+	// prx: wait until another u16 value == old value
+	while (old_order != mutex->m_freed)
 	{
 		std::this_thread::sleep_for(std::chrono::milliseconds(1));
 		if (Emu.IsStopped())
@@ -95,7 +64,9 @@ int cellSyncMutexLock(mem_ptr_t<CellSyncMutex> mutex)
 			break;
 		}
 	}
-	_mm_mfence();
+
+	// prx: sync
+	InterlockedCompareExchange(&mutex->m_data(), 0, 0);
 	return CELL_OK;
 }
 
@@ -103,7 +74,7 @@ int cellSyncMutexTryLock(mem_ptr_t<CellSyncMutex> mutex)
 {
 	cellSync->Log("cellSyncMutexTryLock(mutex=0x%x)", mutex.GetAddr());
 
-	if (!mutex.IsGood())
+	if (!mutex)
 	{
 		return CELL_SYNC_ERROR_NULL_POINTER;
 	}
@@ -112,34 +83,32 @@ int cellSyncMutexTryLock(mem_ptr_t<CellSyncMutex> mutex)
 		return CELL_SYNC_ERROR_ALIGN;
 	}
 
-	int res;
-
 	while (true)
 	{
 		const u32 old_data = mutex->m_data();
 		CellSyncMutex new_mutex;
 		new_mutex.m_data() = old_data;
 
+		// prx: compare two u16 values and exit if not equal
 		if (new_mutex.m_order != new_mutex.m_freed)
 		{
-			res = CELL_SYNC_ERROR_BUSY;
+			return CELL_SYNC_ERROR_BUSY;
 		}
 		else
 		{
 			new_mutex.m_order++;
-			res = CELL_OK;
 		}
 		if (InterlockedCompareExchange(&mutex->m_data(), new_mutex.m_data(), old_data) == old_data) break;
 	}
 
-	return res;
+	return CELL_OK;
 }
 
 int cellSyncMutexUnlock(mem_ptr_t<CellSyncMutex> mutex)
 {
 	cellSync->Log("cellSyncMutexUnlock(mutex=0x%x)", mutex.GetAddr());
 
-	if (!mutex.IsGood())
+	if (!mutex)
 	{
 		return CELL_SYNC_ERROR_NULL_POINTER;
 	}
@@ -148,6 +117,8 @@ int cellSyncMutexUnlock(mem_ptr_t<CellSyncMutex> mutex)
 		return CELL_SYNC_ERROR_ALIGN;
 	}
 
+	InterlockedCompareExchange(&mutex->m_data(), 0, 0);
+
 	while (true)
 	{
 		const u32 old_data = mutex->m_data();
diff --git a/rpcs3/Emu/SysCalls/Modules/cellSync.h b/rpcs3/Emu/SysCalls/Modules/cellSync.h
new file mode 100644
index 0000000000..36a768986e
--- /dev/null
+++ b/rpcs3/Emu/SysCalls/Modules/cellSync.h
@@ -0,0 +1,38 @@
+#pragma once
+
+// Return Codes
+enum
+{
+	CELL_SYNC_ERROR_AGAIN = 0x80410101,
+	CELL_SYNC_ERROR_INVAL = 0x80410102,
+	CELL_SYNC_ERROR_NOMEM = 0x80410104,
+	CELL_SYNC_ERROR_DEADLK = 0x80410108,
+	CELL_SYNC_ERROR_PERM = 0x80410109,
+	CELL_SYNC_ERROR_BUSY = 0x8041010A,
+	CELL_SYNC_ERROR_STAT = 0x8041010F,
+	CELL_SYNC_ERROR_ALIGN = 0x80410110,
+	CELL_SYNC_ERROR_NULL_POINTER = 0x80410111,
+	CELL_SYNC_ERROR_NOT_SUPPORTED_THREAD = 0x80410112,
+	CELL_SYNC_ERROR_NO_NOTIFIER = 0x80410113,
+	CELL_SYNC_ERROR_NO_SPU_CONTEXT_STORAGE = 0x80410114,
+};
+
+struct CellSyncMutex
+{
+	be_t<u16> m_freed;
+	be_t<u16> m_order;
+
+	volatile u32& m_data()
+	{
+		return *reinterpret_cast<u32*>(this);
+	};
+};
+
+static_assert(sizeof(CellSyncMutex) == 4, "CellSyncMutex: wrong size");
+
+struct CellSyncBarrier
+{
+	be_t<u32> m_data;
+};
+
+static_assert(sizeof(CellSyncBarrier) == 4, "CellSyncBarrier: wrong size");
\ No newline at end of file
diff --git a/rpcs3/emucore.vcxproj b/rpcs3/emucore.vcxproj
index 058d68e32b..2ee34fa688 100644
--- a/rpcs3/emucore.vcxproj
+++ b/rpcs3/emucore.vcxproj
@@ -352,6 +352,7 @@
     <ClInclude Include="Emu\SysCalls\Modules\cellResc.h" />
     <ClInclude Include="Emu\SysCalls\Modules\cellRtc.h" />
     <ClInclude Include="Emu\SysCalls\Modules\cellSpurs.h" />
+    <ClInclude Include="Emu\SysCalls\Modules\cellSync.h" />
     <ClInclude Include="Emu\SysCalls\Modules\cellSysutil.h" />
     <ClInclude Include="Emu\SysCalls\Modules\cellSysutil_SaveData.h" />
     <ClInclude Include="Emu\SysCalls\Modules\cellUserInfo.h" />
@@ -560,4 +561,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>
\ No newline at end of file
diff --git a/rpcs3/emucore.vcxproj.filters b/rpcs3/emucore.vcxproj.filters
index 36357d7e1a..446d1a2613 100644
--- a/rpcs3/emucore.vcxproj.filters
+++ b/rpcs3/emucore.vcxproj.filters
@@ -1090,5 +1090,8 @@
     <ClInclude Include="Emu\Memory\DynamicMemoryBlockBase.h">
       <Filter>Emu\Memory</Filter>
     </ClInclude>
+    <ClInclude Include="Emu\SysCalls\Modules\cellSync.h">
+      <Filter>Emu\SysCalls\Modules</Filter>
+    </ClInclude>
   </ItemGroup>
-</Project>
+</Project>
\ No newline at end of file