Józef Kucia : winex11: Make get_vulkan_driver() thread-safe.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6efa2e128c40d714b048dd370cb8aa32c37bd2c8
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=6efa2e128c40d714b048dd370...

Author: Józef Kucia <jkucia(a)codeweavers.com>
Date:   Thu May 31 15:17:34 2018 +0200

winex11: Make get_vulkan_driver() thread-safe.

Signed-off-by: Józef Kucia <jkucia(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 dlls/winex11.drv/vulkan.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/dlls/winex11.drv/vulkan.c b/dlls/winex11.drv/vulkan.c
index 148908b..a72be33 100644
--- a/dlls/winex11.drv/vulkan.c
+++ b/dlls/winex11.drv/vulkan.c
@@ -86,21 +86,17 @@ static inline struct wine_vk_surface *surface_from_handle(VkSurfaceKHR handle)
     return (struct wine_vk_surface *)(uintptr_t)handle;
 }
 
-static BOOL wine_vk_init(void)
-{
-    static BOOL init_done = FALSE;
-    static void *vulkan_handle;
-
-    if (init_done) return (vulkan_handle != NULL);
-    init_done = TRUE;
+static void *vulkan_handle;
 
+static BOOL WINAPI wine_vk_init(INIT_ONCE *once, void *param, void **context)
+{
     if (!(vulkan_handle = wine_dlopen(SONAME_LIBVULKAN, RTLD_NOW, NULL, 0)))
     {
         ERR("Failed to load %s\n", SONAME_LIBVULKAN);
-        return FALSE;
+        return TRUE;
     }
 
-#define LOAD_FUNCPTR(f) if ((p##f = wine_dlsym(vulkan_handle, #f, NULL, 0)) == NULL) return FALSE;
+#define LOAD_FUNCPTR(f) if ((p##f = wine_dlsym(vulkan_handle, #f, NULL, 0)) == NULL) goto fail;
     LOAD_FUNCPTR(vkAcquireNextImageKHR)
     LOAD_FUNCPTR(vkCreateInstance)
     LOAD_FUNCPTR(vkCreateSwapchainKHR)
@@ -121,6 +117,11 @@ static BOOL wine_vk_init(void)
 #undef LOAD_FUNCPTR
 
     return TRUE;
+
+fail:
+    wine_dlclose(vulkan_handle, NULL, 0);
+    vulkan_handle = NULL;
+    return TRUE;
 }
 
 /* Helper function for converting between win32 and X11 compatible VkInstanceCreateInfo.
@@ -558,13 +559,16 @@ static void *X11DRV_get_vk_instance_proc_addr(VkInstance instance, const char *n
 
 const struct vulkan_funcs *get_vulkan_driver(UINT version)
 {
+    static INIT_ONCE init_once = INIT_ONCE_STATIC_INIT;
+
     if (version != WINE_VULKAN_DRIVER_VERSION)
     {
         ERR("version mismatch, vulkan wants %u but driver has %u\n", version, WINE_VULKAN_DRIVER_VERSION);
         return NULL;
     }
 
-    if (wine_vk_init())
+    InitOnceExecuteOnce(&init_once, wine_vk_init, NULL, NULL);
+    if (vulkan_handle)
         return &vulkan_funcs;
 
     return NULL;