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VIDEO: Added priority boost to thread performing SDL processing and updates

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Reworked all priority adjustment code to leverage a new
sim_os_set_thread_priority API which is coded to use pthreads or OS
priority adjustment APIs as necessary.
This commit is contained in:
Mark Pizzolato
2016-06-11 09:52:33 -07:00
parent 3743d3d68a
commit a24aba69ae
9 changed files with 114 additions and 63 deletions
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94
sim_timer.c
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@@ -164,6 +164,59 @@ return sim_os_msec() - start_time;
#define SIM_IDLE_MS_SLEEP sim_os_ms_sleep
#endif
/* Mark the need for the sim_os_set_thread_priority routine, */
/* allowing the feature and/or platform dependent code to provide it */
#define NEED_THREAD_PRIORITY
/* If we've got pthreads support then use pthreads mechanisms */
#if defined(USE_READER_THREAD)
#undef NEED_THREAD_PRIORITY
#if defined(_WIN32)
/* On Windows there are several potentially disjoint threading APIs */
/* in use (base win32 pthreads, libSDL provided threading, and direct */
/* calls to beginthreadex), so go directly to the Win32 threading APIs */
/* to manage thread priority */
t_stat sim_os_set_thread_priority (int below_normal_above)
{
const static int val[3] = {THREAD_PRIORITY_BELOW_NORMAL, THREAD_PRIORITY_NORMAL, THREAD_PRIORITY_ABOVE_NORMAL};
if ((below_normal_above < -1) || (below_normal_above > 1))
return SCPE_ARG;
SetThreadPriority (GetCurrentThread(), val[1 + below_normal_above]);
return SCPE_OK;
}
#else
/* Native pthreads priority implementation */
t_stat sim_os_set_thread_priority (int below_normal_above)
{
int sched_policy, min_prio, max_prio;
struct sched_param sched_priority;
if ((below_normal_above < -1) || (below_normal_above > 1))
return SCPE_ARG;
pthread_getschedparam (pthread_self(), &sched_policy, &sched_priority);
min_prio = sched_get_priority_min(sched_policy);
max_prio = sched_get_priority_max(sched_policy);
switch (below_normal_above) {
case PRIORITY_BELOW_NORMAL:
sched_priority.sched_priority = min_prio;
break;
case PRIORITY_NORMAL:
sched_priority.sched_priority = (max_prio + min_prio) / 2;
break;
case PRIORITY_ABOVE_NORMAL:
sched_priority.sched_priority = max_prio;
break;
}
pthread_setschedparam (pthread_self(), sched_policy, &sched_priority);
return SCPE_OK;
}
#endif
#endif /* defined(USE_READER_THREAD) */
/* OS-dependent timer and clock routines */
/* VMS */
@@ -261,8 +314,6 @@ return 0;
/* Win32 routines */
#include <windows.h>
const t_bool rtc_avail = TRUE;
uint32 sim_os_msec (void)
@@ -494,6 +545,45 @@ treq.tv_nsec = (milliseconds % MILLIS_PER_SEC) * NANOS_PER_MILLI;
return sim_os_msec () - stime;
}
#if defined(NEED_THREAD_PRIORITY)
#undef NEED_THREAD_PRIORITY
#include <sys/time.h>
#include <sys/resource.h>
t_stat sim_os_set_thread_priority (int below_normal_above)
{
if ((below_normal_above < -1) || (below_normal_above > 1))
return SCPE_ARG;
errno = 0;
switch (below_normal_above) {
case PRIORITY_BELOW_NORMAL:
if ((getpriority (PRIO_PROCESS, 0) <= 0) && /* at or above normal pri? */
(errno == 0))
setpriority (PRIO_PROCESS, 0, 10);
break;
case PRIORITY_NORMAL:
if (getpriority (PRIO_PROCESS, 0) != 0) /* at or above normal pri? */
setpriority (PRIO_PROCESS, 0, 0);
break;
case PRIORITY_ABOVE_NORMAL:
if ((getpriority (PRIO_PROCESS, 0) <= 0) && /* at or above normal pri? */
(errno == 0))
setpriority (PRIO_PROCESS, 0, -10);
break;
}
return SCPE_OK;
}
#endif /* defined(NEED_THREAD_PRIORITY) */
#endif
/* If one hasn't been provided yet, then just stub it */
#if defined(NEED_THREAD_PRIORITY)
t_stat sim_os_set_thread_priority (int below_normal_above)
{
return SCPE_OK;
}
#endif
/* diff = min - sub */