Jinoh Kang : msvcp90: Use atomic write for releasing threadsafe_queue spin lock.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: dce7a61fa4f90cb8bf6b22a12e3a23e5f8d75ac3
URL:    https://gitlab.winehq.org/wine/wine/-/commit/dce7a61fa4f90cb8bf6b22a12e3a23e...

Author: Jinoh Kang 
Date:   Mon Sep 19 00:34:47 2022 +0900

msvcp90: Use atomic write for releasing threadsafe_queue spin lock.

This fixes data race in ARM/ARM64 platforms, and prevents potential
memory access reordering by the compiler.

---

dlls/msvcp90/details.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dlls/msvcp90/details.c b/dlls/msvcp90/details.c
index 9b665ee841f..98579dfa991 100644
--- a/dlls/msvcp90/details.c
+++ b/dlls/msvcp90/details.c
@@ -239,7 +239,7 @@ static void threadsafe_queue_push(threadsafe_queue *queue, size_t id,
         queue->tail = p;
         if(!queue->head)
             queue->head = p;
-        queue->lock = 0;
+        WriteRelease(&queue->lock, 0);
     }
     else
     {
@@ -289,7 +289,7 @@ static BOOL threadsafe_queue_pop(threadsafe_queue *queue, size_t id,
         queue->head = p->_Next;
         if(!queue->head)
             queue->tail = NULL;
-        queue->lock = 0;
+        WriteRelease(&queue->lock, 0);

/* TODO: Add exception handling */
         call__Concurrent_queue_base_v4__Deallocate_page(parent, p);