[PATCH v4 3/3] localspl: Unload monitor in DeleteMonitor.

[Dmitry Timoshkov]

Some print monitors are very sensitive to loads/unloads being done
in a quick succession like AddMonitor() does, and that even leads to
crashes because the monitor I have here creates a thread on load and
when the thread starts - the monitor dll is already unloaded.
A solution to this is moving the monitor unloading to DeleteMonitor.

Signed-off-by: Dmitry Timoshkov 
---
 dlls/localspl/provider.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/dlls/localspl/provider.c b/dlls/localspl/provider.c
index 54bd959673..def3215824 100644
--- a/dlls/localspl/provider.c
+++ b/dlls/localspl/provider.c
@@ -1560,10 +1560,7 @@ static BOOL WINAPI fpAddMonitor(LPWSTR pName, DWORD Level, LPBYTE pMonitors)
                 res = FALSE;
             }
             else
-            {
-                monitor_unload(pm);
                 SetLastError(ERROR_SUCCESS); /* Monitor installer depends on this */
-            }
         }

RegCloseKey(hentry);
@@ -1857,6 +1854,7 @@ static BOOL WINAPI fpConfigurePort(LPWSTR pName, HWND hWnd, LPWSTR pPortName)

static BOOL WINAPI fpDeleteMonitor(LPWSTR pName, LPWSTR pEnvironment, LPWSTR pMonitorName)
 {
+    monitor_t *pm;
     HKEY    hroot = NULL;
     LONG    lres;

@@ -1877,6 +1875,18 @@ static BOOL WINAPI fpDeleteMonitor(LPWSTR pName, LPWSTR pEnvironment, LPWSTR pMo
         return FALSE;
     }

+    /* Unload the monitor if it's loaded */
+    EnterCriticalSection(&monitor_handles_cs);
+    LIST_FOR_EACH_ENTRY(pm, &monitor_handles, monitor_t, entry)
+    {
+        if (pm->name && !lstrcmpW(pMonitorName, pm->name))
+        {
+            monitor_unload(pm);
+            break;
+        }
+    }
+    LeaveCriticalSection(&monitor_handles_cs);
+
     if(RegCreateKeyW(HKEY_LOCAL_MACHINE, monitorsW, &hroot) != ERROR_SUCCESS) {
         ERR("unable to create key %s\n", debugstr_w(monitorsW));
         return FALSE;