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83c51fffe6
Allocating on the cygheap would copy information of the tracker into the child process. A forked child knows the timer id and could simply still access the (free'd but still valid) timer_tracker on the heap, which is dangerous and very certainly doesn't reflect POSIX semantics. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
/* timer.h: Define class timer_tracker, base class for posix timers
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef __TIMER_H__
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#define __TIMER_H__
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#define TT_MAGIC 0x513e4a1c
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class timer_tracker
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{
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unsigned magic;
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SRWLOCK srwlock;
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clockid_t clock_id;
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sigevent evp;
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struct itimerspec time_spec;
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HANDLE timer;
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HANDLE cancel_evt;
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HANDLE sync_thr;
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LONG64 interval;
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LONG64 exp_ts;
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LONG overrun_event_running;
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LONG overrun_count_curr;
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LONG64 overrun_count;
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bool cancel ();
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public:
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void *operator new (size_t, void *p) __attribute__ ((nothrow)) {return p;}
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void operator delete (void *p) { HeapFree (GetProcessHeap (), 0, p); }
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timer_tracker (clockid_t, const sigevent *);
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~timer_tracker ();
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inline bool is_timer_tracker () const { return magic == TT_MAGIC; }
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inline sigevent_t *sigevt () { return &evp; }
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inline int getoverrun () const { return overrun_count_curr; }
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LONG64 get_clock_now () const { return get_clock (clock_id)->n100secs (); }
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LONG64 get_exp_ts () const { return exp_ts; }
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LONG64 get_interval () const { return interval; }
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void set_exp_ts (LONG64 ts) { exp_ts = ts; }
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LONG arm_overrun_event ();
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LONG disarm_overrun_event ();
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int gettime (itimerspec *, bool);
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int settime (int, const itimerspec *, itimerspec *);
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DWORD thread_func ();
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static void fixup_after_fork ();
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};
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#endif /* __TIMER_H__ */
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