Libc-1353.100.2.tar.gz

[apple/libc.git] / sys / OSThermalNotification.c

diff --git a/sys/OSThermalNotification.c b/sys/OSThermalNotification.c
index cd4d2b7852001d3d519fa63528930f00ddf8f6ff..36b0042a96426db35f8adc5a13caab8e9c43f83f 100644 (file)
--- a/sys/OSThermalNotification.c
+++ b/sys/OSThermalNotification.c
@@ -22,23 +22,103 @@
  */
 
 #include <libkern/OSThermalNotification.h>
+
+#include <TargetConditionals.h>
+
+#define OSThermalPressureLevelName             "com.apple.system.thermalpressurelevel"
+const char * const kOSThermalNotificationPressureLevelName = OSThermalPressureLevelName;
+
+#if TARGET_OS_IPHONE
+
+#include <dispatch/dispatch.h>
 #include <notify.h>
 
-const char *kOSThermalNotificationName = "com.apple.system.thermalstatus";
+#define OSThermalAlert      "com.apple.system.thermalalert"
+#define OSThermalDecision   "com.apple.system.thermaldecision"
+#define OSThermalStatusName "com.apple.system.thermalstatus"
+
+const char * const kOSThermalNotificationAlert    = OSThermalAlert;
+const char * const kOSThermalNotificationDecision = OSThermalDecision;
+const char * const kOSThermalNotificationName     = OSThermalStatusName;
+
+static const char * const kOSThermalMitigationNames[kOSThermalMitigationCount] = {
+       OSThermalStatusName,
+       "com.apple.system.thermalmitigation.70percenttorch",
+       "com.apple.system.thermalmitigation.70percentbacklight",
+       "com.apple.system.thermalmitigation.50percenttorch",
+       "com.apple.system.thermalmitigation.50percentbacklight",
+       "com.apple.system.thermalmitigation.disabletorch",
+       "com.apple.system.thermalmitigation.25percentbacklight",
+       "com.apple.system.thermalmitigation.disablemapshalo",
+       "com.apple.system.thermalmitigation.appterminate",
+       "com.apple.system.thermalmitigation.devicerestart",
+       "com.apple.system.thermalmitigation.thermaltableready"
+};
+
+static int tokens[kOSThermalMitigationCount];
+static dispatch_once_t predicates[kOSThermalMitigationCount];
+static bool thermalLevelsReady = false;
+
+OSThermalNotificationLevel _OSThermalNotificationLevelForBehavior(int behavior)
+{
+       uint64_t val = OSThermalNotificationLevelAny;
+       if (behavior >= 0 && behavior < kOSThermalMitigationCount) {
+               dispatch_once(&predicates[behavior], ^{
+                       (void)notify_register_check(kOSThermalMitigationNames[behavior], &tokens[behavior]);
+               });
+               (void)notify_get_state(tokens[behavior], &val);
+       }
+       return (OSThermalNotificationLevel)val;
+}
+
+void _OSThermalNotificationSetLevelForBehavior(int level, int behavior)
+{
+       uint64_t val = (uint64_t)level;
+       if (behavior >= 0 && behavior < kOSThermalMitigationCount) {
+               dispatch_once(&predicates[behavior], ^{
+                       (void)notify_register_check(kOSThermalMitigationNames[behavior], &tokens[behavior]);
+               });
+               (void)notify_set_state(tokens[behavior], val);
+
+               // Note:  
+               // - We are ready when we program in the appterminate value. 
+               // - Assumes that user programs kOSThermalMitigationNone level less than 
+               //   kOSThermalMitigationAppTerminate & kOSThermalMitigationDeviceRestart  
+               if (behavior == kOSThermalMitigationAppTerminate) {
+                       dispatch_once(&predicates[kOSThermalMitigationThermalTableReady], ^{
+                               (void)notify_register_check(kOSThermalMitigationNames[kOSThermalMitigationThermalTableReady], &tokens[kOSThermalMitigationThermalTableReady]);
+                       });
+                       (void)notify_set_state(tokens[kOSThermalMitigationThermalTableReady], kOSThermalMitigationCount);
+               }
+       }
+}
+
 
 OSThermalNotificationLevel OSThermalNotificationCurrentLevel(void)
 {
-       uint64_t val;
-       int token;
+       if (thermalLevelsReady) {
+               return _OSThermalNotificationLevelForBehavior(kOSThermalMitigationNone);
+       }
 
-       if (NOTIFY_STATUS_OK != notify_register_check(kOSThermalNotificationName, &token))
-               return OSThermalNotificationLevelAny;
+       uint64_t tableReady = 0;
 
-       if (NOTIFY_STATUS_OK != notify_get_state(token, &val))
-               return OSThermalNotificationLevelAny;
+       dispatch_once(&predicates[kOSThermalMitigationThermalTableReady], ^{
+               (void)notify_register_check(kOSThermalMitigationNames[kOSThermalMitigationThermalTableReady], &tokens[kOSThermalMitigationThermalTableReady]);
+       });
+       (void)notify_get_state(tokens[kOSThermalMitigationThermalTableReady], &tableReady);
 
-       if (NOTIFY_STATUS_OK != notify_cancel(token))
-               return OSThermalNotificationLevelAny;
+       // If we are ready then optimize this so we don't call dispatch everytime.
+       if (tableReady == kOSThermalMitigationCount) {
+               thermalLevelsReady = true;
+               return _OSThermalNotificationLevelForBehavior(kOSThermalMitigationNone); 
+       }
+       else {
+               // Allow reset so we can dynamically change the table without thermal trap screen appearing. 
+               thermalLevelsReady = false;
+       }
 
-       return (OSThermalNotificationLevel)val;
+       // Not ready returns -1, which should not be equal or greater than any other thermal state. 
+       return OSThermalNotificationLevelAny;
 }
+
+#endif // TARGET_OS_IPHONE