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Cygwin: posix timers: reimplement using OS timer

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- Rename files timer.* to posix_timer.*.
- Reimplement using an OS timer rather than a handcrafted wait loop.
- Use a Slim R/W Lock for synchronization.
- Drop timer chaining.  It doesn't server a purpose since all timers
  are local only.
- Rename ttstart to itimer_tracker to better reflect its purpose.
  It's not the anchor for a timer chain anymore anyway.
- Drop fixup_timers_after_fork.  Everything is process-local, nothing
  gets inherited.
- Rename timer_tracker::disarm_event to disarm_overrun_event for
  better readability.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2019-01-22 15:23:05 +01:00
parent 4c50dc94c3
commit 229ea3f23c
7 changed files with 298 additions and 248 deletions
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8
winsup/cygwin/exceptions.cc
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@ -27,7 +27,7 @@ details. */
#include "child_info.h"
#include "ntdll.h"
#include "exception.h"
#include "timer.h"
#include "posix_timer.h"
/* Definitions for code simplification */
#ifdef __x86_64__
@ -1483,7 +1483,7 @@ sigpacket::process ()
if (handler == SIG_IGN)
{
if (si.si_code == SI_TIMER)
((timer_tracker *) si.si_tid)->disarm_event ();
((timer_tracker *) si.si_tid)->disarm_overrun_event ();
sigproc_printf ("signal %d ignored", si.si_signo);
goto done;
}
@ -1508,7 +1508,7 @@ sigpacket::process ()
|| si.si_signo == SIGURG)
{
if (si.si_code == SI_TIMER)
((timer_tracker *) si.si_tid)->disarm_event ();
((timer_tracker *) si.si_tid)->disarm_overrun_event ();
sigproc_printf ("signal %d default is currently ignore", si.si_signo);
goto done;
}
@ -1637,7 +1637,7 @@ _cygtls::call_signal_handler ()
{
timer_tracker *tt = (timer_tracker *)
infodata.si_tid;
infodata.si_overrun = tt->disarm_event ();
infodata.si_overrun = tt->disarm_overrun_event ();
}
/* Save information locally on stack to pass to handler. */