[PATCH v2 2/5] ntdll: Make server_select a memory barrier.

[Torge Matthies]

From: Torge Matthies

---
 dlls/ntdll/unix/server.c  | 3 +++
 dlls/ntdll/unix/virtual.c | 4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/dlls/ntdll/unix/server.c b/dlls/ntdll/unix/server.c
index 51a83f472e1..362c7793cbc 100644
--- a/dlls/ntdll/unix/server.c
+++ b/dlls/ntdll/unix/server.c
@@ -602,6 +602,9 @@ unsigned int server_select( const select_op_t *select_op, data_size_t size, UINT
     sigset_t old_set;
     int signaled;

+    /* ensure writes so far are visible to other threads */
+    MemoryBarrier();
+
     memset( &result, 0, sizeof(result) );

do
diff --git a/dlls/ntdll/unix/virtual.c b/dlls/ntdll/unix/virtual.c
index 2b1581d767a..09fb8eaf4a6 100644
--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -5022,8 +5022,6 @@ void WINAPI NtFlushProcessWriteBuffers(void)
 {
     NTSTATUS status;

-    MemoryBarrier();
-
     do
     {
         select_op_t select_op;
@@ -5040,6 +5038,8 @@ void WINAPI NtFlushProcessWriteBuffers(void)
                                 TIMEOUT_INFINITE, NULL, NULL );
     }
     while (status);
+
+    /* server_select is a memory barrier, so no need to call MemoryBarrier() */
 }