/* -----------------------------------------------------------------------------
- * $Id: Itimer.c,v 1.19 2000/10/06 11:05:57 rrt Exp $
+ * $Id: Itimer.c,v 1.23 2001/08/14 13:40:09 sewardj 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"
/* 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
-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
*/
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 (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 */
+ }
}
}
nat
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.
- (GetTickCount is used for threadDelay)
+ The delivery of ticks isn't free; the performance hit should be checked.
*/
unsigned int delay;
static unsigned int vtalrm_id;
timeKillEvent(vtalrm_id);
timeEndPeriod(1);
}
-# endif
return 0;
}
unsigned int
getourtimeofday(void)
{
- return (unsigned int)GetTickCount() * 1000;
+ return ((unsigned int)GetTickCount() * TICK_FREQUENCY) / 1000;
}
#endif