Acquire a lock before using a certain workspace storage directory and fall back to other directories if necessary

src/vs/workbench/api/common/extHostExtensionService.ts

@@ -204,6 +204,8 @@ export abstract class AbstractExtHostExtensionService extends Disposable impleme
 	}
 
 	public async deactivateAll(): Promise<void> {
+		this._storagePath.onWillDeactivateAll();
+
 		let allPromises: Promise<void>[] = [];
 		try {
 			const allExtensions = this._registry.getAllExtensionDescriptions();