From: Marc-Aurel Zent mzent@codeweavers.com
--- server/thread.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)
diff --git a/server/thread.c b/server/thread.c index 2e7e79f66b3..8665c250c5a 100644 --- a/server/thread.c +++ b/server/thread.c @@ -42,6 +42,7 @@ #endif #ifdef __APPLE__ #include <mach/mach_init.h> +#include <mach/mach_time.h> #include <mach/mach_port.h> #include <mach/thread_act.h> #endif @@ -258,9 +259,21 @@ static void apply_thread_priority( struct thread *thread, int base_priority ) }
#elif defined(__APPLE__) +static unsigned int mach_ticks_per_second;
void init_threading(void) { + struct mach_timebase_info tb_info; + if (mach_timebase_info( &tb_info ) == KERN_SUCCESS) + { + mach_ticks_per_second = (tb_info.denom * 1000000000U) / tb_info.numer; + } + else + { + const unsigned int best_guess = 24000000U; + fprintf(stderr, "wine: mach_timebase_info failed, guessing %u mach ticks per second\n", best_guess); + mach_ticks_per_second = best_guess; + } }
static int get_mach_importance( int base_priority ) @@ -327,6 +340,35 @@ static void apply_thread_priority( struct thread *thread, int base_priority ) THREAD_EXTENDED_POLICY_COUNT ); thread_policy_set( thread_port, THREAD_PRECEDENCE_POLICY, (thread_policy_t)&thread_precedence_policy, THREAD_PRECEDENCE_POLICY_COUNT ); + if (base_priority > THREAD_BASE_PRIORITY_LOWRT) + { + /* For realtime threads we are requesting from the scheduler to be moved + * into the Mach realtime band (96-127) above the kernel. + * The scheduler will bump us back into the application band though if we + * lie too much about our computation constraints... + * The maximum available amount of resources granted in that band is using + * half of the available bus cycles, and computation (nominally 1/10 of + * the time constraint) is a hint to the scheduler where to place our + * realtime threads relative to each other. + * If someone is violating the time contraint policy, they will be moved + * back where they were (non-timeshare application band with very high + * importance), which is on XNU equivalent to setting SCHED_RR with the + * pthread API. */ + struct thread_time_constraint_policy thread_time_constraint_policy; + int realtime_priority = base_priority - THREAD_BASE_PRIORITY_LOWRT; + unsigned int max_constraint = mach_ticks_per_second / 2; + unsigned int max_computation = max_constraint / 10; + /* unfortunately we can't give a hint for the periodicity of calculations */ + thread_time_constraint_policy.period = 0; + thread_time_constraint_policy.constraint = max_constraint; + thread_time_constraint_policy.computation = realtime_priority * max_computation / 16; + /* although it is not possible to disable preemption in NT, this is probably + * nice to have for the maximum possible effective thread priority */ + thread_time_constraint_policy.preemptible = thread->priority == THREAD_PRIORITY_TIME_CRITICAL ? 0 : 1; + thread_policy_set( thread_port, THREAD_TIME_CONSTRAINT_POLICY, + (thread_policy_t)&thread_time_constraint_policy, + THREAD_TIME_CONSTRAINT_POLICY_COUNT ); + } mach_port_deallocate( mach_task_self(), thread_port ); }