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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
winsup/cygwin/Makefile.in
View File

@ -354,6 +354,7 @@ DLL_OFILES:= \
pinfo.o \
poll.o \
posix_ipc.o \
posix_timer.o \
pseudo-reloc.o \
pthread.o \
quotactl.o \
@ -395,7 +396,6 @@ DLL_OFILES:= \
syslog.o \
termios.o \
thread.o \
timer.o \
timerfd.o \
times.o \
tls_pbuf.o \

3
winsup/cygwin/cygheap_malloc.h
View File

@ -34,7 +34,8 @@ enum cygheap_types
HEAP_2_DLL,
HEAP_MMAP,
HEAP_2_MAX = 200,
HEAP_3_FHANDLER
HEAP_3_FHANDLER,
HEAP_3_TIMER
};
extern "C" {

8
winsup/cygwin/exceptions.cc
View File

@ -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. */

2
winsup/cygwin/fork.cc
View File

@ -22,7 +22,6 @@ details. */
#include "tls_pbuf.h"
#include "dll_init.h"
#include "cygmalloc.h"
#include "timer.h"
#include "ntdll.h"
#define NPIDS_HELD 4
@ -196,7 +195,6 @@ frok::child (volatile char * volatile here)
ForceCloseHandle1 (fork_info->forker_finished, forker_finished);
pthread::atforkchild ();
fixup_timers_after_fork ();
cygbench ("fork-child");
ld_preload ();
fixup_hooks_after_fork ();

494
winsup/cygwin/timer.cc → winsup/cygwin/posix_timer.cc
View File

@ -14,65 +14,37 @@ details. */
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "timer.h"
#include "posix_timer.h"
#include <sys/param.h>
#define EVENT_DISARMED 0
#define EVENT_ARMED -1
#define EVENT_LOCK 1
#define OVR_EVENT_DISARMED 0
#define OVR_EVENT_ARMED 1
/* Must not be NO_COPY to avoid memory leak after fork. */
timer_tracker ttstart (CLOCK_REALTIME, NULL);
class lock_timer_tracker
{
static muto protect;
public:
lock_timer_tracker ();
~lock_timer_tracker ();
};
muto NO_COPY lock_timer_tracker::protect;
lock_timer_tracker::lock_timer_tracker ()
{
protect.init ("timer_protect")->acquire ();
}
lock_timer_tracker::~lock_timer_tracker ()
{
protect.release ();
}
timer_tracker NO_COPY itimer_tracker (CLOCK_REALTIME, NULL);
bool
timer_tracker::cancel ()
{
if (!hcancel)
return false;
DWORD res;
SetEvent (hcancel);
DWORD res = WaitForSingleObject (syncthread, INFINITE);
if (res != WAIT_OBJECT_0)
system_printf ("WFSO returned unexpected value %u, %E", res);
if (!cancel_evt)
return false;
SetEvent (cancel_evt);
if (sync_thr)
{
res = WaitForSingleObject (sync_thr, INFINITE);
if (res != WAIT_OBJECT_0)
system_printf ("WFSO returned unexpected value %u, %E", res);
}
return true;
}
timer_tracker::~timer_tracker ()
{
if (cancel ())
{
CloseHandle (hcancel);
#ifdef DEBUGGING
hcancel = NULL;
#endif
}
if (syncthread)
CloseHandle (syncthread);
magic = 0;
}
timer_tracker::timer_tracker (clockid_t c, const sigevent *e)
: magic (TT_MAGIC), clock_id (c), timer (NULL), cancel_evt (NULL),
sync_thr (NULL), interval (0), exp_ts (0), overrun_event_running (0),
overrun_count_curr (0), overrun_count (0)
{
srwlock = SRWLOCK_INIT;
if (e != NULL)
evp = *e;
else
@ -81,18 +53,17 @@ timer_tracker::timer_tracker (clockid_t c, const sigevent *e)
evp.sigev_signo = SIGALRM;
evp.sigev_value.sival_ptr = this;
}
clock_id = c;
magic = TT_MAGIC;
hcancel = NULL;
event_running = EVENT_DISARMED;
overrun_count_curr = 0;
overrun_count = 0;
if (this != &ttstart)
{
lock_timer_tracker here;
next = ttstart.next;
ttstart.next = this;
}
}
timer_tracker::~timer_tracker ()
{
AcquireSRWLockExclusive (&srwlock);
cancel ();
NtClose (cancel_evt);
NtClose (sync_thr);
NtClose (timer);
magic = 0;
ReleaseSRWLockExclusive (&srwlock);
}
static inline int64_t
@ -105,29 +76,26 @@ timespec_to_us (const timespec& ts)
}
/* Returns 0 if arming successful, -1 if a signal is already queued.
If so, it also increments overrun_count. */
If so, it also increments overrun_count. Only call under lock! */
LONG
timer_tracker::arm_event ()
timer_tracker::arm_overrun_event ()
{
LONG ret;
while ((ret = InterlockedCompareExchange (&event_running, EVENT_ARMED,
EVENT_DISARMED)) == EVENT_LOCK)
yield ();
if (ret == EVENT_ARMED)
InterlockedIncrement64 (&overrun_count);
ret = InterlockedExchange (&overrun_event_running, OVR_EVENT_ARMED);
if (ret == OVR_EVENT_ARMED)
ret = InterlockedIncrement64 (&overrun_count);
return ret;
}
LONG
timer_tracker::disarm_event ()
timer_tracker::disarm_overrun_event ()
{
LONG ret;
while ((ret = InterlockedCompareExchange (&event_running, EVENT_LOCK,
EVENT_ARMED)) == EVENT_LOCK)
yield ();
if (ret == EVENT_ARMED)
AcquireSRWLockExclusive (&srwlock);
ret = InterlockedExchange (&overrun_event_running, OVR_EVENT_DISARMED);
if (ret == OVR_EVENT_ARMED)
{
LONG64 ov_cnt;
@ -138,8 +106,8 @@ timer_tracker::disarm_event ()
overrun_count_curr = ov_cnt;
ret = overrun_count_curr;
InterlockedExchange64 (&overrun_count, 0);
InterlockedExchange (&event_running, EVENT_DISARMED);
}
ReleaseSRWLockExclusive (&srwlock);
return ret;
}
@ -151,57 +119,69 @@ notify_thread_wrapper (void *arg)
void * (*notify_func) (void *) = (void * (*) (void *))
evt->sigev_notify_function;
tt->disarm_event ();
tt->disarm_overrun_event ();
return notify_func (evt->sigev_value.sival_ptr);
}
DWORD
timer_tracker::thread_func ()
{
int64_t now;
int64_t cur_sleepto_us = sleepto_us;
HANDLE w4[2] = { timer, cancel_evt };
debug_printf ("%p timer armed", this);
while (1)
{
int64_t sleep_us;
LONG sleep_ms;
/* Account for delays in starting thread
and sending the signal */
now = get_clock (clock_id)->usecs ();
sleep_us = cur_sleepto_us - now;
if (sleep_us > 0)
switch (WaitForMultipleObjects (2, w4, FALSE, INFINITE))
{
sleepto_us = cur_sleepto_us;
sleep_ms = (sleep_us + (USPERSEC / MSPERSEC) - 1)
/ (USPERSEC / MSPERSEC);
}
else
{
int64_t num_intervals = (now - cur_sleepto_us) / interval_us;
InterlockedAdd64 (&overrun_count, num_intervals);
cur_sleepto_us += num_intervals * interval_us;
sleepto_us = cur_sleepto_us;
sleep_ms = 0;
}
debug_printf ("%p waiting for %u ms", this, sleep_ms);
switch (WaitForSingleObject (hcancel, sleep_ms))
{
case WAIT_TIMEOUT:
debug_printf ("timed out");
break;
case WAIT_OBJECT_0:
debug_printf ("%p cancelled", this);
debug_printf ("%p timer expired", this);
break;
case WAIT_OBJECT_0 + 1:
debug_printf ("%p timer disarmed, %E", this);
goto out;
default:
debug_printf ("%p wait failed, %E", this);
continue;
}
AcquireSRWLockExclusive (&srwlock);
/* Make sure we haven't been abandoned and/or disarmed in the meantime */
if (exp_ts == 0 && interval == 0)
{
ReleaseSRWLockExclusive (&srwlock);
goto out;
}
if (interval)
{
/* Compute expiration count. */
LONG64 now = get_clock_now ();
LONG64 ts = get_exp_ts ();
LONG64 exp_cnt;
/* Make concessions for unexact realtime clock */
if (ts > now)
ts = now - 1;
exp_cnt = (now - ts) / interval;
InterlockedAdd64 (&overrun_count, exp_cnt);
ts += interval * exp_cnt;
set_exp_ts (ts);
/* NtSetTimer allows periods of up to 24 days only. If the time
is longer, we set the timer up as one-shot timer for each
interval. Restart timer here with new due time. */
if (interval > INT_MAX * (NS100PERSEC / MSPERSEC))
{
/* TODO: CLOCK_REALTIME_ALARM / CLOCK_BOOTTIME_ALARM
See comment in arm_timer */
BOOL Resume = FALSE;
LARGE_INTEGER DueTime = { QuadPart: -interval };
NtSetTimer (timer, &DueTime, NULL, NULL, Resume, 0, NULL);
}
}
switch (evp.sigev_notify)
{
case SIGEV_SIGNAL:
{
if (arm_event ())
if (arm_overrun_event ())
{
debug_printf ("%p timer signal already queued", this);
break;
@ -217,7 +197,7 @@ timer_tracker::thread_func ()
}
case SIGEV_THREAD:
{
if (arm_event ())
if (arm_overrun_event ())
{
debug_printf ("%p timer thread already queued", this);
break;
@ -243,10 +223,16 @@ timer_tracker::thread_func ()
break;
}
}
if (!interval_us)
break;
cur_sleepto_us = sleepto_us + interval_us;
/* one-shot timer? */
if (!interval)
{
memset (&time_spec, 0, sizeof time_spec);
exp_ts = 0;
overrun_event_running = OVR_EVENT_DISARMED;
ReleaseSRWLockExclusive (&srwlock);
goto out;
}
ReleaseSRWLockExclusive (&srwlock);
debug_printf ("looping");
}
@ -262,58 +248,166 @@ timer_thread (VOID *x)
return tt->thread_func ();
}
static inline bool
timespec_bad (const timespec& t)
int
timer_tracker::gettime (itimerspec *curr_value, bool lock)
{
if (t.tv_nsec < 0 || t.tv_nsec >= NSPERSEC || t.tv_sec < 0)
if (lock)
{
set_errno (EINVAL);
return true;
AcquireSRWLockExclusive (&srwlock);
if (!is_timer_tracker ())
{
ReleaseSRWLockExclusive (&srwlock);
return -EINVAL;
}
}
return false;
if (!cancel_evt)
memset (curr_value, 0, sizeof (*curr_value));
else
{
LONG64 next_relative_exp = get_exp_ts () - get_clock_now ();
curr_value->it_value.tv_sec = next_relative_exp / NS100PERSEC;
next_relative_exp -= curr_value->it_value.tv_sec * NS100PERSEC;
curr_value->it_value.tv_nsec = next_relative_exp
* (NSPERSEC / NS100PERSEC);
curr_value->it_interval = time_spec.it_interval;
}
if (lock)
ReleaseSRWLockExclusive (&srwlock);
return 0;
}
int
timer_tracker::settime (int in_flags, const itimerspec *value, itimerspec *ovalue)
timer_tracker::settime (int flags, const itimerspec *new_value,
itimerspec *old_value)
{
int ret = -1;
__try
{
if (!value)
if (!new_value || !valid_timespec (new_value->it_value)
|| !valid_timespec (new_value->it_interval))
{
set_errno (EINVAL);
ret = -EINVAL;
__leave;
}
if (timespec_bad (value->it_value) || timespec_bad (value->it_interval))
__leave;
AcquireSRWLockExclusive (&srwlock);
if (!is_timer_tracker ())
{
ReleaseSRWLockExclusive (&srwlock);
ret = -EINVAL;
__leave;
}
lock_timer_tracker here;
cancel ();
if (old_value)
gettime (old_value, false);
if (ovalue)
gettime (ovalue);
if (!value->it_value.tv_sec && !value->it_value.tv_nsec)
interval_us = sleepto_us = 0;
if (!new_value->it_value.tv_sec && !new_value->it_value.tv_nsec)
{
cancel ();
memset (&time_spec, 0, sizeof time_spec);
interval = 0;
exp_ts = 0;
}
else
{
interval_us = timespec_to_us (value->it_interval);
sleepto_us = timespec_to_us (value->it_value);
if (!(in_flags & TIMER_ABSTIME))
sleepto_us += get_clock (clock_id)->usecs ();
it_interval = value->it_interval;
if (!hcancel)
hcancel = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
LONG64 ts;
LARGE_INTEGER DueTime;
BOOLEAN Resume;
LONG Period;
NTSTATUS status;
if (!timer)
{
OBJECT_ATTRIBUTES attr;
InitializeObjectAttributes (&attr, NULL, 0, NULL,
sec_none_nih.lpSecurityDescriptor);
status = NtCreateEvent (&cancel_evt, EVENT_ALL_ACCESS, &attr,
NotificationEvent, FALSE);
if (!NT_SUCCESS (status))
{
ret = -geterrno_from_nt_status (status);
__leave;
}
status = NtCreateEvent (&sync_thr, EVENT_ALL_ACCESS, &attr,
NotificationEvent, FALSE);
if (!NT_SUCCESS (status))
{
NtClose (cancel_evt);
cancel_evt = NULL;
ret = -geterrno_from_nt_status (status);
__leave;
}
status = NtCreateTimer (&timer, TIMER_ALL_ACCESS, &attr,
SynchronizationTimer);
if (!NT_SUCCESS (status))
{
NtClose (cancel_evt);
NtClose (sync_thr);
cancel_evt = sync_thr = NULL;
ret = -geterrno_from_nt_status (status);
__leave;
}
}
ResetEvent (cancel_evt);
ResetEvent (sync_thr);
NtCancelTimer (timer, NULL);
/* Convert incoming itimerspec into 100ns interval and timestamp */
interval = new_value->it_interval.tv_sec * NS100PERSEC
+ (new_value->it_interval.tv_nsec
+ (NSPERSEC / NS100PERSEC) - 1)
/ (NSPERSEC / NS100PERSEC);
ts = new_value->it_value.tv_sec * NS100PERSEC
+ (new_value->it_value.tv_nsec + (NSPERSEC / NS100PERSEC) - 1)
/ (NSPERSEC / NS100PERSEC);
if (flags & TIMER_ABSTIME)
{
if (clock_id == CLOCK_REALTIME)
DueTime.QuadPart = ts + FACTOR;
else /* non-REALTIME clocks require relative DueTime. */
{
DueTime.QuadPart = get_clock_now () - ts;
/* If the timestamp was earlier than now, compute number
of expirations and offset DueTime to expire immediately. */
if (DueTime.QuadPart >= 0)
DueTime.QuadPart = -1LL;
}
}
else
ResetEvent (hcancel);
if (!syncthread)
syncthread = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
{
/* Keep relative timestamps relative for the timer, but store the
expiry timestamp absolute for the timer thread. */
DueTime.QuadPart = -ts;
ts += get_clock_now ();
}
set_exp_ts (ts);
time_spec = *new_value;
overrun_count_curr = 0;
overrun_count = 0;
overrun_event_running = OVR_EVENT_DISARMED;
/* TODO: CLOCK_REALTIME_ALARM / CLOCK_BOOTTIME_ALARM
Note: Advanced Power Settings -> Sleep -> Allow Wake Timers
since W10 1709 */
Resume = FALSE;
if (interval > INT_MAX * (NS100PERSEC / MSPERSEC))
Period = 0;
else
ResetEvent (syncthread);
new cygthread (timer_thread, this, "itimer", syncthread);
Period = (interval + (NS100PERSEC / MSPERSEC) - 1)
/ (NS100PERSEC / MSPERSEC);
status = NtSetTimer (timer, &DueTime, NULL, NULL, Resume, Period,
NULL);
if (!NT_SUCCESS (status))
{
memset (&time_spec, 0, sizeof time_spec);
interval = 0;
exp_ts = 0;
ret = -geterrno_from_nt_status (status);
__leave;
}
new cygthread (timer_thread, this, "itimer", sync_thr);
}
ReleaseSRWLockExclusive (&srwlock);
ret = 0;
}
__except (EFAULT) {}
@ -321,78 +415,12 @@ timer_tracker::settime (int in_flags, const itimerspec *value, itimerspec *ovalu
return ret;
}
void
timer_tracker::gettime (itimerspec *ovalue)
{
if (!hcancel)
memset (ovalue, 0, sizeof (*ovalue));
else
{
ovalue->it_interval = it_interval;
int64_t now = get_clock (clock_id)->usecs ();
int64_t left_us = sleepto_us - now;
if (left_us < 0)
left_us = 0;
ovalue->it_value.tv_sec = left_us / USPERSEC;
ovalue->it_value.tv_nsec = (left_us % USPERSEC) * (NSPERSEC/USPERSEC);
}
}
int
timer_tracker::clean_and_unhook ()
{
for (timer_tracker *tt = &ttstart; tt->next != NULL; tt = tt->next)
if (tt->next == this)
{
tt->next = this->next;
return 0;
}
return -1;
}
void
timer_tracker::fixup_after_fork ()
{
ttstart.hcancel = ttstart.syncthread = NULL;
ttstart.event_running = EVENT_DISARMED;
ttstart.overrun_count_curr = 0;
ttstart.overrun_count = 0;
for (timer_tracker *tt = &ttstart; tt->next != NULL; /* nothing */)
{
timer_tracker *deleteme = tt->next;
tt->next = deleteme->next;
deleteme->hcancel = deleteme->syncthread = NULL;
delete deleteme;
}
}
void
fixup_timers_after_fork ()
{
timer_tracker::fixup_after_fork ();
}
extern "C" int
timer_gettime (timer_t timerid, struct itimerspec *ovalue)
{
int ret = -1;
__try
{
timer_tracker *tt = (timer_tracker *) timerid;
if (!tt->is_timer_tracker ())
{
set_errno (EINVAL);
return -1;
}
tt->gettime (ovalue);
ret = 0;
}
__except (EFAULT) {}
__endtry
return ret;
}
/* The timers are stored on the cygheap. */
#define cnew(name, ...) \
({ \
void* ptr = (void*) ccalloc (HEAP_3_TIMER, 1, sizeof (name)); \
ptr ? new (ptr) name (__VA_ARGS__) : NULL; \
})
extern "C" int
timer_create (clockid_t clock_id, struct sigevent *__restrict evp,
@ -414,7 +442,7 @@ timer_create (clockid_t clock_id, struct sigevent *__restrict evp,
return -1;
}
*timerid = (timer_t) new timer_tracker (clock_id, evp);
*timerid = (timer_t) cnew (timer_tracker, clock_id, evp);
ret = 0;
}
__except (EFAULT) {}
@ -422,6 +450,29 @@ timer_create (clockid_t clock_id, struct sigevent *__restrict evp,
return ret;
}
extern "C" int
timer_gettime (timer_t timerid, struct itimerspec *ovalue)
{
int ret = -1;
__try
{
timer_tracker *tt = (timer_tracker *) timerid;
if (!tt->is_timer_tracker ())
{
set_errno (EINVAL);
return -1;
}
ret = tt->gettime (ovalue, true);
if (ret < 0)
set_errno (-ret);
}
__except (EFAULT) {}
__endtry
return ret;
}
extern "C" int
timer_settime (timer_t timerid, int flags,
const struct itimerspec *__restrict value,
@ -438,6 +489,8 @@ timer_settime (timer_t timerid, int flags,
__leave;
}
ret = tt->settime (flags, value, ovalue);
if (ret < 0)
set_errno (-ret);
}
__except (EFAULT) {}
__endtry
@ -476,20 +529,12 @@ timer_delete (timer_t timerid)
__try
{
timer_tracker *in_tt = (timer_tracker *) timerid;
if (!in_tt->is_timer_tracker ())
if (!in_tt->is_timer_tracker () || in_tt == &itimer_tracker)
{
set_errno (EINVAL);
__leave;
}
lock_timer_tracker here;
if (in_tt->clean_and_unhook () == 0)
{
delete in_tt;
ret = 0;
}
else
set_errno (EINVAL);
delete in_tt;
}
__except (EFAULT) {}
__endtry
@ -513,7 +558,8 @@ setitimer (int which, const struct itimerval *__restrict value,
spec_value.it_interval.tv_nsec = value->it_interval.tv_usec * 1000;
spec_value.it_value.tv_sec = value->it_value.tv_sec;
spec_value.it_value.tv_nsec = value->it_value.tv_usec * 1000;
ret = timer_settime ((timer_t) &ttstart, 0, &spec_value, &spec_ovalue);
ret = timer_settime ((timer_t) &itimer_tracker, 0,
&spec_value, &spec_ovalue);
if (ret)
ret = -1;
else if (ovalue)
@ -541,7 +587,7 @@ getitimer (int which, struct itimerval *ovalue)
__try
{
struct itimerspec spec_ovalue;
ret = timer_gettime ((timer_t) &ttstart, &spec_ovalue);
ret = timer_gettime ((timer_t) &itimer_tracker, &spec_ovalue);
if (!ret)
{
ovalue->it_interval.tv_sec = spec_ovalue.it_interval.tv_sec;
@ -567,7 +613,7 @@ alarm (unsigned int seconds)
if (seconds > (CLOCK_DELAY_MAX / 1000 - 1))
seconds = (CLOCK_DELAY_MAX / 1000 - 1);
newt.it_value.tv_sec = seconds;
timer_settime ((timer_t) &ttstart, 0, &newt, &oldt);
timer_settime ((timer_t) &itimer_tracker, 0, &newt, &oldt);
int ret = oldt.it_value.tv_sec + (oldt.it_value.tv_nsec > 0);
syscall_printf ("%d = alarm(%u)", ret, seconds);
return ret;
@ -589,7 +635,7 @@ ualarm (useconds_t value, useconds_t interval)
timer.it_interval.tv_sec = interval / USPERSEC;
timer.it_interval.tv_nsec = (interval % USPERSEC) * (NSPERSEC/USPERSEC);
}
timer_settime ((timer_t) &ttstart, 0, &timer, &otimer);
timer_settime ((timer_t) &itimer_tracker, 0, &timer, &otimer);
useconds_t ret = otimer.it_value.tv_sec * USPERSEC
+ (otimer.it_value.tv_nsec + (NSPERSEC/USPERSEC) - 1)
/ (NSPERSEC/USPERSEC);

33
winsup/cygwin/timer.h → winsup/cygwin/posix_timer.h
View File

@ -13,38 +13,43 @@ details. */
class timer_tracker
{
unsigned magic;
timer_tracker *next;
SRWLOCK srwlock;
clockid_t clock_id;
sigevent evp;
timespec it_interval;
HANDLE hcancel;
HANDLE syncthread;
int64_t interval_us;
int64_t sleepto_us;
LONG event_running;
struct itimerspec time_spec;
HANDLE timer;
HANDLE cancel_evt;
HANDLE sync_thr;
LONG64 interval;
LONG64 exp_ts;
LONG overrun_event_running;
LONG overrun_count_curr;
LONG64 overrun_count;
bool cancel ();
public:
void *operator new (size_t, void *p) __attribute__ ((nothrow)) {return p;}
void operator delete (void *p) { cfree (p); }
timer_tracker (clockid_t, const sigevent *);
~timer_tracker ();
inline bool is_timer_tracker () const { return magic == TT_MAGIC; }
inline sigevent_t *sigevt () { return &evp; }
inline int getoverrun () const { return overrun_count_curr; }
void gettime (itimerspec *);
LONG64 get_clock_now () const { return get_clock (clock_id)->n100secs (); }
LONG64 get_exp_ts () const { return exp_ts; }
LONG64 get_interval () const { return interval; }
void set_exp_ts (LONG64 ts) { exp_ts = ts; }
LONG arm_overrun_event ();
LONG disarm_overrun_event ();
int gettime (itimerspec *, bool);
int settime (int, const itimerspec *, itimerspec *);
int clean_and_unhook ();
LONG arm_event ();
LONG disarm_event ();
DWORD thread_func ();
static void fixup_after_fork ();
};
extern void fixup_timers_after_fork ();
#endif /* __TIMER_H__ */

4
winsup/cygwin/signal.cc
View File

@ -21,7 +21,7 @@ details. */
#include "dtable.h"
#include "cygheap.h"
#include "cygwait.h"
#include "timer.h"
#include "posix_timer.h"
#define _SA_NORESTART 0x8000
@ -619,7 +619,7 @@ sigwait_common (const sigset_t *set, siginfo_t *info, PLARGE_INTEGER waittime)
{
timer_tracker *tt = (timer_tracker *)
_my_tls.infodata.si_tid;
_my_tls.infodata.si_overrun = tt->disarm_event ();
_my_tls.infodata.si_overrun = tt->disarm_overrun_event ();
}
if (info)
*info = _my_tls.infodata;