Code sniplets are based on examples provided by Apple. See
http://developer.apple.com/library/mac/#documentation/Darwin/Conceptual/KernelProgramming/scheduler/scheduler.html
---
src/pulsecore/core-util.c | 37 ++++++++++++++++++++++++++++++++++++-
1 files changed, 36 insertions(+), 1 deletions(-)
diff --git a/src/pulsecore/core-util.c b/src/pulsecore/core-util.c
index a713cae..5747f6e 100644
--- a/src/pulsecore/core-util.c
+++ b/src/pulsecore/core-util.c
@@ -107,6 +107,10 @@
#ifdef __APPLE__
#include <xlocale.h>
+#include <mach/mach_init.h>
+#include <mach/thread_act.h>
+#include <mach/thread_policy.h>
+#include <sys/sysctl.h>
#endif
#ifdef HAVE_DBUS
@@ -685,7 +689,38 @@ static int set_scheduler(int rtprio) {
* the thread is already realtime, don't do anything. */
int pa_make_realtime(int rtprio) {
-#ifdef _POSIX_PRIORITY_SCHEDULING
+#if defined(OS_IS_DARWIN)
+ struct thread_time_constraint_policy ttcpolicy;
+ uint64_t freq = 0;
+ size_t size = sizeof(freq);
+ int ret;
+
+ ret = sysctlbyname("hw.cpufrequency", &freq, &size, NULL, 0);
+ if (ret < 0) {
+ pa_log_info("Unable to read CPU frequency using sysctlbyname()");
+ return 0;
+ }
+
+ pa_log_debug("sysctl for hw.cpufrequency: %llu", freq);
+
+ /* See
http://developer.apple.com/library/mac/#documentation/Darwin/Conceptual/KernelProgramming/scheduler/scheduler.html
*/
+ ttcpolicy.period = freq / 160;
+ ttcpolicy.computation = freq / 3300;
+ ttcpolicy.constraint = freq / 2200;
+ ttcpolicy.preemptible = 1;
+
+ ret = thread_policy_set(mach_thread_self(),
+ THREAD_TIME_CONSTRAINT_POLICY,
+ (thread_policy_t) &ttcpolicy,
+ THREAD_TIME_CONSTRAINT_POLICY_COUNT);
+ if (ret)
+ pa_log_info("Unable to set real-time thread priority (%d).", ret);
+ else
+ pa_log_info("Successfully set real-time thread priority.");
+
+ return ret;
+
+#elif _POSIX_PRIORITY_SCHEDULING
int p;
if (set_scheduler(rtprio) >= 0) {
--
1.7.1
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