/* -----------------------------------------------------------------------------
- * $Id: Itimer.c,v 1.10 2000/03/14 01:43:27 sof Exp $
+ * $Id: Itimer.c,v 1.19 2000/10/06 11:05:57 rrt Exp $
*
* (c) The GHC Team, 1995-1999
*
#endif
#include "Rts.h"
+#include "RtsFlags.h"
#include "Itimer.h"
+#include "Proftimer.h"
#include "Schedule.h"
/* As recommended in the autoconf manual */
#endif
lnat total_ticks = 0;
-rtsBool do_prof_ticks = rtsFalse;
+
+/* ticks left before next pre-emptive context switch */
+int ticks_to_ctxt_switch = 0;
static
void
#if defined(mingw32_TARGET_OS) || (defined(cygwin32_TARGET_OS) && !defined(HAVE_SETITIMER))
CALLBACK
-#endif
+handle_tick(UINT uID STG_UNUSED, UINT uMsg STG_UNUSED, DWORD dwUser STG_UNUSED,
+ DWORD dw1 STG_UNUSED, DWORD d STG_UNUSED);
+#else
handle_tick(int unused STG_UNUSED);
+#endif
/* -----------------------------------------------------------------------------
Tick handler
- We use the ticker for two things: supporting threadDelay, and time
- profiling.
+ We use the ticker for time profiling.
SMP note: this signal could be delivered to *any* thread. We have
to ensure that it doesn't matter which thread actually runs the
void
#if defined(mingw32_TARGET_OS) || (defined(cygwin32_TARGET_OS) && !defined(HAVE_SETITIMER))
CALLBACK
-#endif
+handle_tick(UINT uID STG_UNUSED, UINT uMsg STG_UNUSED, DWORD dwUser STG_UNUSED,
+ DWORD dw1 STG_UNUSED, DWORD d STG_UNUSED)
+#else
handle_tick(int unused STG_UNUSED)
+#endif
{
total_ticks++;
#ifdef PROFILING
- if (do_prof_ticks == rtsTrue) {
- CCS_TICK(CCCS);
- }
+ handleProfTick();
#endif
- /* For threadDelay etc., see Select.c */
- ticks_since_select++;
+ /* so we can get a rough indication of the current time at any point
+ * without having to call gettimeofday() (see Select.c):
+ */
+ ticks_since_timestamp++;
+
+ ticks_to_ctxt_switch--;
+ if (ticks_to_ctxt_switch <= 0) {
+ ticks_to_ctxt_switch = RtsFlags.ConcFlags.ctxtSwitchTicks;
+ context_switch = 1; /* schedule a context switch */
+ }
}
#if defined(mingw32_TARGET_OS) || (defined(cygwin32_TARGET_OS) && !defined(HAVE_SETITIMER))
-/*
- * Sigh - to avoid requiring anyone that wants to build ghc to have
- * to augment the Win32 header files that comes with cygwinb20.1,
- * include the missing MM API decls here inline.
- *
- * ToDo: check and remove these once the next version of cygwin is
- * released.
- */
-#define TIMERR_NOERROR 0
-#define TIMERR_NOCANDO 97
-#define TIME_PERIODIC 1
-
-typedef UINT MMRESULT;
-typedef void CALLBACK (*TIMECALLBACK) (UINT, UINT, DWORD, DWORD, DWORD);
-typedef TIMECALLBACK *LPTIMECALLBACK;
-MMRESULT STDCALL timeSetEvent(UINT, UINT, LPTIMECALLBACK, DWORD, UINT);
-/*
- vtalrm_handler is assigned and set up in Signals.c
-
- vtalrm_id (defined in Signals.c) holds
- the system id for the current timer (used to
- later block/kill it.)
-*/
-extern nat vtalrm_id;
-TIMECALLBACK *vtalrm_cback;
-
+LPTIMECALLBACK vtalrm_cback;
+
nat
initialize_virtual_timer(nat ms)
{
As the delivery of ticks isn't free, we only
enable it if we really needed, i.e., when profiling.
- (the RTS now also needs timer ticks to implement
- threadDelay in non-profiling mode, but the pure
- Win32 port doesn't support that.....yet.)
+ (GetTickCount is used for threadDelay)
*/
- unsigned int delay,vtalrm_id;
+ unsigned int delay;
+ static unsigned int vtalrm_id;
- delay = timeBeginPeriod(1);
- if (delay == TIMERR_NOCANDO) { /* error of some sort. */
- return delay;
+ if (ms) {
+ delay = timeBeginPeriod(1);
+ if (delay == TIMERR_NOCANDO) { /* error of some sort. */
+ return delay;
+ }
+ vtalrm_id =
+ timeSetEvent(ms, /* event every `delay' milliseconds. */
+ 1, /* precision is within 1 ms */
+ vtalrm_cback,
+ TIME_CALLBACK_FUNCTION, /* ordinary callback */
+ TIME_PERIODIC);
+ } else {
+ timeKillEvent(vtalrm_id);
+ timeEndPeriod(1);
}
- vtalrm_id =
- timeSetEvent(ms, /* event every `delay' milliseconds. */
- 1, /* precision is within 5 millisecs. */
- (LPTIMECALLBACK)vtalrm_cback,
- 0,
- TIME_PERIODIC);
# endif
+
return 0;
}
initialize_virtual_timer(nat ms)
{
# ifndef HAVE_SETITIMER
- fprintf(stderr, "No virtual timer on this system\n");
+ /* fprintf(stderr, "No virtual timer on this system\n"); */
return -1;
# else
struct itimerval it;
+ timestamp = getourtimeofday();
+ ticks_since_timestamp = 0;
+
it.it_value.tv_sec = ms / 1000;
it.it_value.tv_usec = 1000 * (ms - (1000 * it.it_value.tv_sec));
it.it_interval = it.it_value;
struct itimerspec it;
timer_t tid;
+ timestamp = getourtimeofday();
+ ticks_since_timestamp = 0;
+
se.sigev_notify = SIGEV_SIGNAL;
se.sigev_signo = SIGVTALRM;
se.sigev_value.sival_int = SIGVTALRM;
(void) sigprocmask(SIG_UNBLOCK, &signals, NULL);
}
#endif
+
+/* gettimeofday() takes around 1us on our 500MHz PIII. Since we're
+ * only calling it 50 times/s, it shouldn't have any great impact.
+ */
+#if !defined(mingw32_TARGET_OS)
+unsigned int
+getourtimeofday(void)
+{
+ struct timeval tv;
+ gettimeofday(&tv, (struct timezone *) NULL);
+ return (tv.tv_sec * TICK_FREQUENCY +
+ tv.tv_usec * TICK_FREQUENCY / 1000000);
+}
+#else
+unsigned int
+getourtimeofday(void)
+{
+ return (unsigned int)GetTickCount() * 1000;
+}
+#endif
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