Projet_SETI_RISC-V/riscv-gnu-toolchain/newlib/winsup/cygwin/timerfd.h

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2023-03-06 14:48:14 +01:00
/* timerfd.h: Define timerfd classes
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#ifndef __TIMERFD_H__
#define __TIMERFD_H__
#include "clock.h"
#include "ntdll.h"
class timerfd_shared
{
clockid_t _clockid; /* clockid */
struct itimerspec _time_spec; /* original incoming itimerspec */
LONG64 _exp_ts; /* start timestamp or next expire timestamp
in 100ns */
LONG64 _interval; /* timer interval in 100ns */
LONG64 _expiration_count; /* expiry counter */
int _flags; /* settime flags */
DWORD _tc_time; /* timestamp of the last WM_TIMECHANGE msg */
/* read access methods */
LONG64 get_clock_now () const { return get_clock (_clockid)->n100secs (); }
struct itimerspec &time_spec () { return _time_spec; }
int get_flags () const { return _flags; }
void set_flags (int nflags) { _flags = nflags; }
/* write access methods */
void set_clockid (clockid_t clock_id) { _clockid = clock_id; }
void increment_expiration_count (LONG64 add)
{ InterlockedAdd64 (&_expiration_count, add); }
void set_expiration_count (LONG64 newval)
{ InterlockedExchange64 (&_expiration_count, newval); }
LONG64 reset_expiration_count ()
{ return InterlockedExchange64 (&_expiration_count, 0); }
int arm_timer (int, const struct itimerspec *);
int disarm_timer ()
{
memset (&_time_spec, 0, sizeof _time_spec);
_exp_ts = 0;
_interval = 0;
/* _flags = 0; DON'T DO THAT. Required for TFD_TIMER_CANCEL_ON_SET */
return 0;
}
void set_exp_ts (LONG64 ts) { _exp_ts = ts; }
friend class timerfd_tracker;
};
class timerfd_tracker /* cygheap! */
{
/* Shared handles */
HANDLE tfd_shared_hdl; /* handle to shared mem */
HANDLE _access_mtx; /* controls access to shared data */
HANDLE _arm_evt; /* settimer sets event when timer is armed,
unsets event when timer gets disarmed. */
HANDLE _disarm_evt; /* settimer sets event when timer is armed,
unsets event when timer gets disarmed. */
HANDLE _timer; /* SynchronizationTimer */
HANDLE _expired_evt; /* Signal if timer expired, Unsignal on read. */
/* Process-local handles */
HANDLE cancel_evt; /* Signal thread to exit. */
HANDLE sync_thr; /* cygthread sync object. */
/* pointer to shared timerfd, misc */
timerfd_shared *tfd_shared; /* pointer to shared mem, needs
NtMapViewOfSection in each new process. */
LONG instance_count; /* each open fd increments this.
If 0 -> cancel thread. */
DWORD winpid; /* This is used @ fork/exec time to know if
this tracker already has been fixed up. */
HWND window; /* window handle */
ATOM atom; /* window class */
void create_timechange_window ();
void delete_timechange_window ();
void handle_timechange_window ();
bool dtor ();
bool enter_critical_section ()
{
return (WaitForSingleObject (_access_mtx, INFINITE) & ~WAIT_ABANDONED_0)
== WAIT_OBJECT_0;
}
/* A version that honors a cancel event, for use in thread_func. */
int enter_critical_section_cancelable ();
void leave_critical_section ()
{
ReleaseMutex (_access_mtx);
}
HANDLE arm_evt () const { return _arm_evt; }
HANDLE disarm_evt () const { return _disarm_evt; }
HANDLE timer () const { return _timer; }
HANDLE expired_evt () const { return _expired_evt; }
void timer_expired () { SetEvent (_expired_evt); }
int arm_timer (int flags, const struct itimerspec *new_value);
int disarm_timer ()
{
ResetEvent (_arm_evt);
tfd_shared->disarm_timer ();
NtCancelTimer (timer (), NULL);
SetEvent (_disarm_evt);
return 0;
}
void timer_expired () const { timer_expired (); }
LONG64 expiration_count () const { return tfd_shared->_expiration_count; }
void increment_expiration_count (LONG64 add) const
{ tfd_shared->increment_expiration_count (add); }
void set_expiration_count (LONG64 exp_cnt) const
{ tfd_shared->set_expiration_count ((LONG64) exp_cnt); }
LONG64 read_and_reset_expiration_count ()
{
LONG64 ret = tfd_shared->reset_expiration_count ();
if (ret)
ResetEvent (_expired_evt);
return ret;
}
struct timespec it_value () const
{ return tfd_shared->time_spec ().it_value; }
struct timespec it_interval () const
{ return tfd_shared->time_spec ().it_interval; }
void set_clockid (clockid_t clock_id) { tfd_shared->set_clockid (clock_id); }
clock_t get_clockid () const { return tfd_shared->_clockid; }
LONG64 get_clock_now () const { return tfd_shared->get_clock_now (); }
struct itimerspec &time_spec () { return tfd_shared->time_spec (); }
LONG64 get_exp_ts () const { return tfd_shared->_exp_ts; }
LONG64 get_interval () const { return tfd_shared->_interval; }
void set_interval (LONG64 intv) { tfd_shared->_interval = intv; }
int get_flags () const { return tfd_shared->get_flags (); }
void set_flags (int nflags) { tfd_shared->set_flags (nflags); }
DWORD tc_time () const { return tfd_shared->_tc_time; }
void set_tc_time (DWORD new_time) { tfd_shared->_tc_time = new_time; }
void set_exp_ts (LONG64 ts) const { tfd_shared->set_exp_ts (ts); }
LONG decrement_instances () { return InterlockedDecrement (&instance_count); }
public:
void *operator new (size_t, void *p) __attribute__ ((nothrow)) {return p;}
timerfd_tracker ()
: tfd_shared_hdl (NULL), _access_mtx (NULL), _arm_evt (NULL),
_disarm_evt (NULL), cancel_evt (NULL), sync_thr (NULL), tfd_shared (NULL),
instance_count (1), winpid (0), window (NULL), atom (0) {}
void init_fixup_after_fork_exec ();
void fixup_after_fork_exec (bool);
void fixup_after_fork ()
{
init_fixup_after_fork_exec ();
fixup_after_fork_exec (false);
}
void fixup_after_exec () { fixup_after_fork_exec (true); }
void dup () { InterlockedIncrement (&instance_count); }
HANDLE get_timerfd_handle () const { return expired_evt (); }
LONG64 wait (bool);
int ioctl_set_ticks (uint64_t);
int create (clockid_t);
int gettime (struct itimerspec *);
int settime (int, const struct itimerspec *, struct itimerspec *);
static void dtor (timerfd_tracker *);
DWORD thread_func ();
};
#endif /* __TIMERFD_H__ */