/* -----------------------------------------------------------------------------
- * $Id: Itimer.c,v 1.13 2000/04/03 15:54:49 simonmar Exp $
+ * $Id: Itimer.c,v 1.26 2001/11/22 14:25:12 simonmar Exp $
*
* (c) The GHC Team, 1995-1999
*
* to support. So much for standards.
*/
-#if !defined(_AIX)
-# define NON_POSIX_SOURCE
-#endif
+/* This is not posix compliant. */
+/* #include "PosixSource.h" */
#include "Rts.h"
+#include "RtsFlags.h"
#include "Itimer.h"
#include "Proftimer.h"
#include "Schedule.h"
lnat total_ticks = 0;
-static
-void
-#if defined(mingw32_TARGET_OS) || (defined(cygwin32_TARGET_OS) && !defined(HAVE_SETITIMER))
-CALLBACK
-#endif
-handle_tick(int unused STG_UNUSED);
+/* ticks left before next pre-emptive context switch */
+int ticks_to_ctxt_switch = 0;
/* -----------------------------------------------------------------------------
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++;
handleProfTick();
#endif
- /* For threadDelay etc., see Select.c */
- ticks_since_select++;
+ if (RtsFlags.ConcFlags.ctxtSwitchTicks > 0) {
+ 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;
-
-nat
+LPTIMECALLBACK vtalrm_cback;
+
+int
initialize_virtual_timer(nat ms)
{
-# ifdef PROFILING
/* On Win32 setups that don't have support for
setitimer(), we use the MultiMedia API's timer
support.
- 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.)
+ The delivery of ticks isn't free; the performance hit should be checked.
*/
- unsigned int delay,vtalrm_id;
+ unsigned int delay;
+ static unsigned int vtalrm_id = 0;
+ static unsigned int period = -1;
- delay = timeBeginPeriod(1);
- if (delay == TIMERR_NOCANDO) { /* error of some sort. */
- return delay;
+ /* A zero argument value means shutdown. */
+ if (ms != 0) {
+ TIMECAPS tc;
+
+ if ( timeGetDevCaps(&tc, sizeof(TIMECAPS)) == TIMERR_NOERROR) {
+ period = tc.wPeriodMin;
+ delay = timeBeginPeriod(period);
+ if (delay == TIMERR_NOCANDO) { /* error of some sort. */
+ return -1;
+ }
+ } else {
+ return -1;
+ }
+
+ vtalrm_id =
+ timeSetEvent(ms, /* event every `delay' milliseconds. */
+ 1, /* precision is within 1 ms */
+ vtalrm_cback,
+ TIME_CALLBACK_FUNCTION, /* ordinary callback */
+ TIME_PERIODIC);
+ } else {
+ /* Shutdown the MM timer */
+ if ( vtalrm_id != 0 ) {
+ timeKillEvent(vtalrm_id);
+ }
+ if (period > 0) {
+ timeEndPeriod(period);
+ }
}
- vtalrm_id =
- timeSetEvent(ms, /* event every `delay' milliseconds. */
- 1, /* precision is within 5 millisecs. */
- (LPTIMECALLBACK)vtalrm_cback,
- 0,
- TIME_PERIODIC);
-# endif
+
+ initProfTimer();
+
return 0;
}
#else
-nat
+int
initialize_virtual_timer(nat ms)
{
# ifndef HAVE_SETITIMER
# else
struct itimerval it;
+ timestamp = getourtimeofday();
+
+#ifdef PROFILING
+ initProfTimer();
+#endif
+
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;
# endif
}
-#endif /* !cygwin32_TARGET_OS */
+#endif /* !{mingw,cygwin32}_TARGET_OS */
# if 0
/* This is a potential POSIX version */
-nat
+int
initialize_virtual_timer(nat ms)
{
struct sigevent se;
struct itimerspec it;
timer_t tid;
+ timestamp = getourtimeofday();
+
+ initProfTimer();
+
se.sigev_notify = SIGEV_SIGNAL;
se.sigev_signo = SIGVTALRM;
se.sigev_value.sival_int = SIGVTALRM;
it.it_value.tv_sec = ms / 1000;
it.it_value.tv_nsec = 1000000 * (ms - 1000 * it.it_value.tv_sec);
it.it_interval = it.it_value;
- timer_settime(tid, TIMER_RELTIME, &it, NULL);
+ return timer_settime(tid, TIMER_RELTIME, &it, NULL);
}
# endif
}
#endif
-#if !defined(HAVE_SETITIMER) && !defined(mingw32_TARGET_OS)
+/* 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 * 1000000 + tv.tv_usec);
+ return (tv.tv_sec * TICK_FREQUENCY +
+ tv.tv_usec * TICK_FREQUENCY / 1000000);
+}
+#else
+unsigned int
+getourtimeofday(void)
+{
+ return ((unsigned int)GetTickCount() * TICK_FREQUENCY) / 1000;
}
#endif
projects / ghc-hetmet.git / blobdiff