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osx: add routines for real-time thread scheduling

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Code sniplets are based on examples provided by Apple. See
http://developer.apple.com/library/mac/#documentation/Darwin/Conceptual/KernelProgramming/scheduler/scheduler.html
This commit is contained in:
Daniel Mack 2011-03-20 17:57:49 +01:00
parent 85c5a2d749
commit fc339a608e
1 changed files with 37 additions and 1 deletions
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38
src/pulsecore/core-util.c
View file

@ -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 +689,39 @@ 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, acquisition of real-time scheduling failed.");
return -1;
}
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 (%08x).", ret);
return -1;
}
pa_log_info("Successfully acquired real-time thread priority.");
return 0;
#elif _POSIX_PRIORITY_SCHEDULING
int p;
if (set_scheduler(rtprio) >= 0) {