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[Engine] use QoS classes in iOS engine. (flutter/engine#46265)

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Hint to the CPU scheduler which of our threads are more important. This change should result in more stable rendering times on CI, but likely doesn't have any other observable effects.
This commit is contained in:
Jonah Williams 2023-09-25 12:06:09 -07:00 committed by GitHub
parent 867fc32087
commit f5ff960253
1 changed files with 3 additions and 0 deletions
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engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterEngine.mm
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@ -49,15 +49,18 @@ static void IOSPlatformThreadConfigSetter(const fml::Thread::ThreadConfig& confi
// set thread priority
switch (config.priority) {
case fml::Thread::ThreadPriority::BACKGROUND: {
pthread_set_qos_class_self_np(QOS_CLASS_BACKGROUND, 0);
[[NSThread currentThread] setThreadPriority:0];
break;
}
case fml::Thread::ThreadPriority::NORMAL: {
pthread_set_qos_class_self_np(QOS_CLASS_DEFAULT, 0);
[[NSThread currentThread] setThreadPriority:0.5];
break;
}
case fml::Thread::ThreadPriority::RASTER:
case fml::Thread::ThreadPriority::DISPLAY: {
pthread_set_qos_class_self_np(QOS_CLASS_USER_INTERACTIVE, 0);
[[NSThread currentThread] setThreadPriority:1.0];
sched_param param;
int policy;