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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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27
sim_console.c
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@@ -2156,17 +2156,13 @@ pthread_cond_t sim_console_startup_cond;
static void *
_console_poll(void *arg)
{
int sched_policy;
struct sched_param sched_priority;
int wait_count = 0;
DEVICE *d;
/* Boost Priority for this I/O thread vs the CPU instruction execution
thread which, in general, won't be readily yielding the processor when
this thread needs to run */
pthread_getschedparam (pthread_self(), &sched_policy, &sched_priority);
++sched_priority.sched_priority;
pthread_setschedparam (pthread_self(), sched_policy, &sched_priority);
sim_os_set_thread_priority (PRIORITY_ABOVE_NORMAL);
sim_debug (DBG_ASY, &sim_con_telnet, "_console_poll() - starting\n");
@@ -2529,7 +2525,7 @@ if (sim_log) {
fflush (sim_log);
_setmode (_fileno (sim_log), _O_BINARY);
}
SetThreadPriority (GetCurrentThread(), THREAD_PRIORITY_BELOW_NORMAL);
sim_os_set_thread_priority (PRIORITY_BELOW_NORMAL);
return SCPE_OK;
}
@@ -2539,7 +2535,7 @@ if (sim_log) {
fflush (sim_log);
_setmode (_fileno (sim_log), _O_TEXT);
}
SetThreadPriority (GetCurrentThread(), THREAD_PRIORITY_NORMAL);
sim_os_set_thread_priority (PRIORITY_NORMAL);
if ((std_input) && /* If Not Background process? */
(std_input != INVALID_HANDLE_VALUE) &&
(!SetConsoleMode(std_input, saved_mode))) /* Restore Normal mode */
@@ -2952,13 +2948,13 @@ if (ioctl (0, TIOCSETC, &runtchars) < 0)
return SCPE_TTIERR;
if (ioctl (0, TIOCSLTC, &runltchars) < 0)
return SCPE_TTIERR;
nice (10); /* lower priority */
sim_os_set_thread_priority (PRIORITY_BELOW_NORMAL)l /* lower priority */
return SCPE_OK;
}
static t_stat sim_os_ttcmd (void)
{
nice (-10); /* restore priority */
sim_os_set_thread_priority (PRIORITY_NORMAL); /* restore priority */
fcntl (0, F_SETFL, cmdfl); /* block mode */
if (ioctl (0, TIOCSETP, &cmdtty) < 0)
return SCPE_TTIERR;
@@ -3026,7 +3022,6 @@ return SCPE_OK;
#include <unistd.h>
struct termios cmdtty, runtty;
static int prior_norm = 1;
static t_stat sim_os_ttinit (void)
{
@@ -3085,11 +3080,7 @@ runtty.c_cc[VINTR] = sim_int_char; /* in case changed */
#endif
if (tcsetattr (0, TCSAFLUSH, &runtty) < 0)
return SCPE_TTIERR;
if (prior_norm) { /* at normal pri? */
errno = 0;
(void)nice (10); /* try to lower pri */
prior_norm = errno; /* if no error, done */
}
sim_os_set_thread_priority (PRIORITY_BELOW_NORMAL); /* try to lower pri */
return SCPE_OK;
}
@@ -3097,11 +3088,7 @@ static t_stat sim_os_ttcmd (void)
{
if (!isatty (fileno (stdin))) /* skip if !tty */
return SCPE_OK;
if (!prior_norm) { /* priority down? */
errno = 0;
(void)nice (-10); /* try to raise pri */
prior_norm = (errno == 0); /* if no error, done */
}
sim_os_set_thread_priority (PRIORITY_NORMAL); /* try to raise pri */
if (tcsetattr (0, TCSAFLUSH, &cmdtty) < 0)
return SCPE_TTIERR;
return SCPE_OK;