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gdi32: Don't store the display driver in the global list to avoid the need for locking.

This commit is contained in:
Alexandre Julliard 2010-05-06 13:48:24 +02:00
parent 0e4f742f06
commit 8dc9e8786b
1 changed files with 28 additions and 22 deletions
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50
dlls/gdi32/driver.c
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@ -209,7 +209,6 @@ static struct graphics_driver *create_driver( HMODULE module )
}
else memset( &driver->funcs, 0, sizeof(driver->funcs) );
list_add_head( &drivers, &driver->entry );
return driver;
}
@ -221,6 +220,7 @@ static struct graphics_driver *create_driver( HMODULE module )
*/
static struct graphics_driver *load_display_driver(void)
{
struct graphics_driver *driver;
char buffer[MAX_PATH], libname[32], *name, *next;
HMODULE module = 0;
HKEY hkey;
@ -247,13 +247,18 @@ static struct graphics_driver *load_display_driver(void)
name = next;
}
if (!(display_driver = create_driver( module )))
if (!(driver = create_driver( module )))
{
MESSAGE( "Could not create graphics driver '%s'\n", buffer );
FreeLibrary( module );
ExitProcess(1);
}
if (InterlockedCompareExchangePointer( (void **)&display_driver, driver, NULL ))
{
/* somebody beat us to it */
FreeLibrary( driver->module );
HeapFree( GetProcessHeap(), 0, driver );
}
return display_driver;
}
@ -264,47 +269,48 @@ static struct graphics_driver *load_display_driver(void)
const DC_FUNCTIONS *DRIVER_load_driver( LPCWSTR name )
{
HMODULE module;
struct graphics_driver *driver;
struct graphics_driver *driver, *new_driver;
static const WCHAR displayW[] = { 'd','i','s','p','l','a','y',0 };
static const WCHAR display1W[] = {'\\','\\','.','\\','D','I','S','P','L','A','Y','1',0};
EnterCriticalSection( &driver_section );
/* display driver is a special case */
if (!strcmpiW( name, displayW ) ||
!strcmpiW( name, display1W ))
if (!strcmpiW( name, displayW ) || !strcmpiW( name, display1W ))
{
driver = load_display_driver();
LeaveCriticalSection( &driver_section );
return &driver->funcs;
}
if ((module = GetModuleHandleW( name )))
{
if (display_driver && display_driver->module == module) return &display_driver->funcs;
EnterCriticalSection( &driver_section );
LIST_FOR_EACH_ENTRY( driver, &drivers, struct graphics_driver, entry )
{
if (driver->module == module)
{
LeaveCriticalSection( &driver_section );
return &driver->funcs;
}
if (driver->module == module) goto done;
}
}
if (!(module = LoadLibraryW( name )))
{
LeaveCriticalSection( &driver_section );
return NULL;
}
if (!(driver = create_driver( module )))
if (!(module = LoadLibraryW( name ))) return NULL;
if (!(new_driver = create_driver( module )))
{
FreeLibrary( module );
LeaveCriticalSection( &driver_section );
return NULL;
}
/* check if someone else added it in the meantime */
EnterCriticalSection( &driver_section );
LIST_FOR_EACH_ENTRY( driver, &drivers, struct graphics_driver, entry )
{
if (driver->module != module) continue;
FreeLibrary( module );
HeapFree( GetProcessHeap(), 0, new_driver );
goto done;
}
driver = new_driver;
list_add_head( &drivers, &driver->entry );
TRACE( "loaded driver %p for %s\n", driver, debugstr_w(name) );
done:
LeaveCriticalSection( &driver_section );
return &driver->funcs;
}