launchd-842.90.1.tar.gz

diff --git a/liblaunch/launch_priv.h b/liblaunch/launch_priv.h
index 518cf958effd72f48f7bb766b1ca8f81b8f93fd7..16e0aad67477e7a8a19e3d47b4893cc3ad29a5a8 100644 (file)
--- a/liblaunch/launch_priv.h
+++ b/liblaunch/launch_priv.h
@@ -102,6 +102,7 @@ __BEGIN_DECLS
 #define LAUNCH_JOBKEY_MACH_HOSTSPECIALPORT "HostSpecialPort"
 #define LAUNCH_JOBKEY_MACH_ENTERKERNELDEBUGGERONCLOSE "EnterKernelDebuggerOnClose"
 #define LAUNCH_JOBKEY_LOWPRIORITYBACKGROUNDIO "LowPriorityBackgroundIO"
+#define LAUNCH_JOBKEY_LEGACYTIMERS "LegacyTimers"
 
 #define LAUNCH_ENV_INSTANCEID "LaunchInstanceID"
 

diff --git a/man/launchd.plist.5 b/man/launchd.plist.5
index f7f5a090a233cd23f7d77bd62aa0c678b4550113..6cdb638d82a3f696690d65ed8b671c190d3455f8 100644 (file)
--- a/man/launchd.plist.5
+++ b/man/launchd.plist.5
@@ -361,6 +361,13 @@ none. Interactive jobs are critical to maintaining a responsive user experience,
 and this key should only be used if an app's ability to be responsive depends
 on it, and cannot be made Adaptive.
 .El
+.It Sy LegacyTimers <boolean>
+This optional key controls the behavior of timers created by the job. By default
+on OS X Mavericks version 10.9 and later, timers created by launchd jobs are 
+coalesced. Batching the firing of timers with similar deadlines improves the 
+overall energy efficiency of the system. If this key is set to true, timers 
+created by the job will opt into less efficient but more precise behavior and
+not be coalesced with other timers.
 .It Sy AbandonProcessGroup <boolean>
 When a job dies,
 .Nm launchd

diff --git a/src/core.c b/src/core.c
index e5720e4d4db120221cad456cb8e383af2b8fc285..61c4c3309c25d1abb5fc6c661aadee6ea514ba51 100644 (file)
--- a/src/core.c
+++ b/src/core.c
@@ -738,7 +738,8 @@ struct job_s {
                implicit_reap:1,
                system_app :1,
                joins_gui_session :1,
-               low_priority_background_io :1;
+               low_priority_background_io :1,
+               legacy_timers :1;
 
        const char label[0];
 };
@@ -2469,6 +2470,13 @@ job_import_bool(job_t j, const char *key, bool value)
                } else if (strcasecmp(key, LAUNCH_JOBKEY_LOWPRIORITYBACKGROUNDIO) == 0) {
                        j->low_priority_background_io = true;
                        found_key = true;
+               } else if (strcasecmp(key, LAUNCH_JOBKEY_LEGACYTIMERS) == 0) {
+#if !TARGET_OS_EMBEDDED
+                       j->legacy_timers = value;
+#else // !TARGET_OS_EMBEDDED
+                       job_log(j, LOG_ERR, "This key is not supported on this platform: %s", key);
+#endif // !TARGET_OS_EMBEDDED
+                       found_key = true;
                }
                break;
        case 'm':
@@ -4675,8 +4683,10 @@ job_start_child(job_t j)
                .task_throughput_qos_tier = THROUGHPUT_QOS_LAUNCH_DEFAULT_TIER,
        };
 
-       kr = task_policy_set(mach_task_self(), TASK_BASE_QOS_POLICY, (task_policy_t)&qosinfo, TASK_QOS_POLICY_COUNT);
-       (void)job_assumes_zero_p(j, kr);
+       if (!j->legacy_timers) {
+               kr = task_policy_set(mach_task_self(), TASK_BASE_QOS_POLICY, (task_policy_t)&qosinfo, TASK_QOS_POLICY_COUNT);
+               (void)job_assumes_zero_p(j, kr);
+       }
 #endif
 
 #if HAVE_RESPONSIBILITY