1 files changed, 45 insertions, 0 deletions
diff --git a/hal/windows/WindowsProcessPriority.cpp b/hal/windows/WindowsProcessPriority.cpp
new file mode 100644
index 0000000000..c660991278
--- /dev/null
+++ b/hal/windows/WindowsProcessPriority.cpp
@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Hal.h"
+#include "HalLog.h"
+
+#include <windows.h>
+
+using namespace mozilla::hal;
+
+namespace mozilla {
+namespace hal_impl {
+
+bool SetProcessPrioritySupported() { return true; }
+
+void SetProcessPriority(int aPid, ProcessPriority aPriority) {
+  HAL_LOG("WindowsProcessPriority - SetProcessPriority(%d, %s)\n", aPid,
+          ProcessPriorityToString(aPriority));
+
+  nsAutoHandle processHandle(
+      ::OpenProcess(PROCESS_SET_INFORMATION, FALSE, aPid));
+#ifdef DEBUG
+  if (!processHandle) {
+    printf_stderr("::OpenProcess() failed with error %#08x\n",
+                  ::GetLastError());
+  }
+#endif  // DEBUG
+  MOZ_ASSERT(processHandle);
+  if (processHandle) {
+    DWORD priority = NORMAL_PRIORITY_CLASS;
+    if (aPriority == PROCESS_PRIORITY_BACKGROUND) {
+      priority = IDLE_PRIORITY_CLASS;
+    } else if (aPriority == PROCESS_PRIORITY_BACKGROUND_PERCEIVABLE) {
+      priority = BELOW_NORMAL_PRIORITY_CLASS;
+    }
+    ::SetPriorityClass(processHandle, priority);
+  }
+
+  HAL_LOG("WindowsProcessPriority - priority set to %d for pid %d\n", aPriority,
+          aPid);
+}
+
+}  // namespace hal_impl
+}  // namespace mozilla