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Commit e30e0fb8 authored by sof's avatar sof
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[project @ 2001-11-27 01:51:23 by sof] 

Rearranged how the virtual timer 'subsystem' is brought up and down:

* "int startVirtTimer(nat ms)" now starts the vtimer/ticker.
* "int stopVirtTimer()" shuts down the ticker.

i.e., removed install_vtalrm_handler() and initialize_virtual_timer().
parent 5985b613
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ghc/rts/Itimer.c
View file @ e30e0fb8
/* -----------------------------------------------------------------------------
* $Id: Itimer.c,v 1.27 2001/11/26 12:58:17 simonpj Exp $
* $Id: Itimer.c,v 1.28 2001/11/27 01:51:23 sof Exp $
*
* (c) The GHC Team, 1995-1999
*
......@@ -61,6 +61,7 @@ int ticks_to_ctxt_switch = 0;
static
void
#if defined(mingw32_TARGET_OS) || (defined(cygwin32_TARGET_OS) && !defined(HAVE_SETITIMER))
CALLBACK
handle_tick(UINT uID STG_UNUSED, UINT uMsg STG_UNUSED, DWORD dwUser STG_UNUSED,
DWORD dw1 STG_UNUSED, DWORD d STG_UNUSED)
......@@ -97,10 +98,12 @@ handle_tick(int unused STG_UNUSED)
#if defined(mingw32_TARGET_OS) || (defined(cygwin32_TARGET_OS) && !defined(HAVE_SETITIMER))
LPTIMECALLBACK vtalrm_cback;
static LPTIMECALLBACK vtalrm_cback;
static unsigned int vtalrm_id = 0;
static unsigned int period = -1;
int
initialize_virtual_timer(nat ms)
startVirtTimer(nat ms)
{
/* On Win32 setups that don't have support for
setitimer(), we use the MultiMedia API's timer
......@@ -109,50 +112,65 @@ initialize_virtual_timer(nat ms)
The delivery of ticks isn't free; the performance hit should be checked.
*/
unsigned int delay;
static unsigned int vtalrm_id = 0;
static unsigned int period = -1;
/* 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 {
TIMECAPS tc;
vtalrm_cback = handle_tick;
if ( timeGetDevCaps(&tc, sizeof(TIMECAPS)) == TIMERR_NOERROR) {
period = tc.wPeriodMin;
delay = timeBeginPeriod(period);
if (delay == TIMERR_NOCANDO) { /* error of some sort. */
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);
}
return -1;
}
#ifdef PROFILING
initProfTimer();
#endif
vtalrm_id =
timeSetEvent(ms, /* event every `delay' milliseconds. */
1, /* precision is within 1 ms */
vtalrm_cback,
TIME_CALLBACK_FUNCTION, /* ordinary callback */
TIME_PERIODIC);
return 0;
}
int
stopVirtTimer()
{
/* Shutdown the MM timer */
if ( vtalrm_id != 0 ) {
timeKillEvent(vtalrm_id);
}
if (period > 0) {
timeEndPeriod(period);
}
return 0;
}
#else
static
int
install_vtalrm_handler(void)
{
struct sigaction action;
action.sa_handler = handle_tick;
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
return sigaction(SIGVTALRM, &action, NULL);
}
int
initialize_virtual_timer(nat ms)
startVirtTimer(nat ms)
{
# ifndef HAVE_SETITIMER
/* fprintf(stderr, "No virtual timer on this system\n"); */
......@@ -160,6 +178,8 @@ initialize_virtual_timer(nat ms)
# else
struct itimerval it;
install_vtalrm_handler(void)
timestamp = getourtimeofday();
#ifdef PROFILING
......@@ -173,12 +193,28 @@ initialize_virtual_timer(nat ms)
# endif
}
int
stopVirtTimer()
{
# ifndef HAVE_SETITIMER
/* fprintf(stderr, "No virtual timer on this system\n"); */
return -1;
# else
struct itimerval it;
it.it_value.tv_sec = 0;
it.it_value.tv_usec = 0;
it.it_interval = it.it_value;
return (setitimer(ITIMER_VIRTUAL, &it, NULL));
# endif
}
#endif /* !{mingw,cygwin32}_TARGET_OS */
# if 0
/* This is a potential POSIX version */
int
initialize_virtual_timer(nat ms)
startVirtTimer(nat ms)
{
struct sigevent se;
struct itimerspec it;
......@@ -186,7 +222,9 @@ initialize_virtual_timer(nat ms)
timestamp = getourtimeofday();
#ifdef PROFILING
initProfTimer();
#endif
se.sigev_notify = SIGEV_SIGNAL;
se.sigev_signo = SIGVTALRM;
......@@ -199,30 +237,32 @@ initialize_virtual_timer(nat ms)
it.it_interval = it.it_value;
return timer_settime(tid, TIMER_RELTIME, &it, NULL);
}
# endif
#if defined(mingw32_TARGET_OS) || (defined(cygwin32_TARGET_OS) && !defined(HAVE_SETITIMER))
int
install_vtalrm_handler(void)
stopVirtTimer()
{
vtalrm_cback = handle_tick;
return 0;
}
#else
int
install_vtalrm_handler(void)
{
struct sigaction action;
action.sa_handler = handle_tick;
struct sigevent se;
struct itimerspec it;
timer_t tid;
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
timestamp = getourtimeofday();
return sigaction(SIGVTALRM, &action, NULL);
se.sigev_notify = SIGEV_SIGNAL;
se.sigev_signo = SIGVTALRM;
se.sigev_value.sival_int = SIGVTALRM;
if (timer_create(CLOCK_VIRTUAL, &se, &tid)) {
barf("can't create virtual timer");
}
it.it_value.tv_sec = 0;
it.it_value.tv_nsec = 0;
it.it_interval = it.it_value;
return timer_settime(tid, TIMER_RELTIME, &it, NULL);
}
# endif
#if defined(mingw32_TARGET_OS) || (defined(cygwin32_TARGET_OS) && !defined(HAVE_SETITIMER))
#else
void
block_vtalrm_signal(void)
{
......
ghc/rts/Itimer.h
View file @ e30e0fb8
/* -----------------------------------------------------------------------------
* $Id: Itimer.h,v 1.9 2001/11/22 14:25:12 simonmar Exp $
* $Id: Itimer.h,v 1.10 2001/11/27 01:51:23 sof Exp $
*
* (c) The GHC Team 1998-2001
*
......@@ -15,8 +15,8 @@
*/
#define CS_MIN_MILLISECS TICK_MILLISECS /* milliseconds per slice */
int initialize_virtual_timer ( nat ms );
int install_vtalrm_handler ( void );
int startVirtTimer( nat ms );
int stopVirtTimer ( void );
void block_vtalrm_signal ( void );
void unblock_vtalrm_signal ( void );
unsigned int getourtimeofday ( void );
ghc/rts/RtsStartup.c
View file @ e30e0fb8
/* -----------------------------------------------------------------------------
* $Id: RtsStartup.c,v 1.57 2001/11/26 16:54:22 simonmar Exp $
* $Id: RtsStartup.c,v 1.58 2001/11/27 01:51:23 sof Exp $
*
* (c) The GHC Team, 1998-2000
*
......@@ -162,9 +162,8 @@ startupHaskell(int argc, char *argv[], void (*init_root)(void))
initProfiling2();
#endif
/* start the ticker */
install_vtalrm_handler();
initialize_virtual_timer(TICK_MILLISECS);
/* start the virtual timer 'subsystem'. */
startVirtTimer(TICK_MILLISECS);
/* start our haskell execution tasks */
#ifdef SMP
......@@ -292,7 +291,7 @@ shutdownHaskell(void)
exitScheduler();
/* stop the ticker */
initialize_virtual_timer(0);
stopVirtTimer();
/* reset the standard file descriptors to blocking mode */
resetNonBlockingFd(0);
......
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