499 lines
11 KiB
C++
499 lines
11 KiB
C++
/* timer.cc
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Copyright 2004, 2005, 2006, 2008, 2010, 2011, 2012, 2013, 2014 Red Hat, Inc.
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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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#include "winsup.h"
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#include "thread.h"
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#include "cygtls.h"
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#include "sigproc.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#define TT_MAGIC 0x513e4a1c
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struct timer_tracker
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{
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unsigned magic;
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clockid_t clock_id;
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sigevent evp;
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timespec it_interval;
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HANDLE hcancel;
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HANDLE syncthread;
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long long interval_us;
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long long sleepto_us;
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bool cancel ();
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struct timer_tracker *next;
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int settime (int, const itimerspec *, itimerspec *);
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void gettime (itimerspec *);
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timer_tracker (clockid_t, const sigevent *);
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~timer_tracker ();
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friend void fixup_timers_after_fork ();
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};
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timer_tracker NO_COPY ttstart (CLOCK_REALTIME, NULL);
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class lock_timer_tracker
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{
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static muto protect;
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public:
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lock_timer_tracker ();
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~lock_timer_tracker ();
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};
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muto NO_COPY lock_timer_tracker::protect;
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lock_timer_tracker::lock_timer_tracker ()
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{
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protect.init ("timer_protect")->acquire ();
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}
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lock_timer_tracker::~lock_timer_tracker ()
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{
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protect.release ();
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}
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bool
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timer_tracker::cancel ()
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{
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if (!hcancel)
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return false;
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SetEvent (hcancel);
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DWORD res = WaitForSingleObject (syncthread, INFINITE);
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if (res != WAIT_OBJECT_0)
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system_printf ("WFSO returned unexpected value %u, %E", res);
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return true;
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}
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timer_tracker::~timer_tracker ()
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{
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if (cancel ())
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{
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CloseHandle (hcancel);
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#ifdef DEBUGGING
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hcancel = NULL;
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#endif
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}
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if (syncthread)
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CloseHandle (syncthread);
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magic = 0;
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}
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timer_tracker::timer_tracker (clockid_t c, const sigevent *e)
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{
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if (e != NULL)
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evp = *e;
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else
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{
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evp.sigev_notify = SIGEV_SIGNAL;
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evp.sigev_signo = SIGALRM;
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evp.sigev_value.sival_ptr = this;
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}
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clock_id = c;
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magic = TT_MAGIC;
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hcancel = NULL;
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if (this != &ttstart)
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{
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lock_timer_tracker here;
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next = ttstart.next;
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ttstart.next = this;
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}
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}
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static long long
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to_us (const timespec& ts)
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{
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long long res = ts.tv_sec;
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res *= 1000000;
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res += ts.tv_nsec / 1000 + ((ts.tv_nsec % 1000) ? 1 : 0);
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return res;
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}
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static DWORD WINAPI
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timer_thread (VOID *x)
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{
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timer_tracker *tt = ((timer_tracker *) x);
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long long now;
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long long sleepto_us = tt->sleepto_us;
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while (1)
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{
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long long sleep_us;
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LONG sleep_ms;
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/* Account for delays in starting thread
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and sending the signal */
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now = gtod.usecs ();
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sleep_us = sleepto_us - now;
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if (sleep_us > 0)
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{
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tt->sleepto_us = sleepto_us;
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sleep_ms = (sleep_us + 999) / 1000;
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}
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else
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{
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tt->sleepto_us = now;
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sleep_ms = 0;
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}
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debug_printf ("%p waiting for %u ms", x, sleep_ms);
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switch (WaitForSingleObject (tt->hcancel, sleep_ms))
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{
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case WAIT_TIMEOUT:
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debug_printf ("timed out");
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break;
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case WAIT_OBJECT_0:
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debug_printf ("%p cancelled", x);
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goto out;
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default:
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debug_printf ("%p wait failed, %E", x);
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goto out;
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}
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switch (tt->evp.sigev_notify)
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{
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case SIGEV_SIGNAL:
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{
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siginfo_t si = {0};
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si.si_signo = tt->evp.sigev_signo;
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si.si_sigval.sival_ptr = tt->evp.sigev_value.sival_ptr;
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si.si_code = SI_TIMER;
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debug_printf ("%p sending signal %d", x, tt->evp.sigev_signo);
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sig_send (myself_nowait, si);
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break;
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}
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case SIGEV_THREAD:
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{
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pthread_t notify_thread;
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debug_printf ("%p starting thread", x);
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pthread_attr_t *attr;
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pthread_attr_t default_attr;
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if (tt->evp.sigev_notify_attributes)
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attr = tt->evp.sigev_notify_attributes;
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else
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{
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pthread_attr_init(attr = &default_attr);
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pthread_attr_setdetachstate (attr, PTHREAD_CREATE_DETACHED);
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}
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int rc = pthread_create (¬ify_thread, attr,
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(void * (*) (void *)) tt->evp.sigev_notify_function,
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tt->evp.sigev_value.sival_ptr);
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if (rc)
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{
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debug_printf ("thread creation failed, %E");
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return 0;
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}
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// FIXME: pthread_join?
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break;
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}
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}
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if (!tt->interval_us)
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break;
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sleepto_us = tt->sleepto_us + tt->interval_us;
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debug_printf ("looping");
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}
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out:
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_my_tls._ctinfo->auto_release (); /* automatically return the cygthread to the cygthread pool */
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return 0;
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}
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static bool
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it_bad (const timespec& t)
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{
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if (t.tv_nsec < 0 || t.tv_nsec >= 1000000000 || t.tv_sec < 0)
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{
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set_errno (EINVAL);
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return true;
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}
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return false;
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}
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int
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timer_tracker::settime (int in_flags, const itimerspec *value, itimerspec *ovalue)
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{
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int ret = -1;
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__try
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{
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if (!value)
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{
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set_errno (EINVAL);
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__leave;
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}
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if (it_bad (value->it_value) || it_bad (value->it_interval))
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__leave;
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long long now = in_flags & TIMER_ABSTIME ? 0 : gtod.usecs ();
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lock_timer_tracker here;
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cancel ();
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if (ovalue)
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gettime (ovalue);
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if (!value->it_value.tv_sec && !value->it_value.tv_nsec)
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interval_us = sleepto_us = 0;
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else
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{
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sleepto_us = now + to_us (value->it_value);
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interval_us = to_us (value->it_interval);
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it_interval = value->it_interval;
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if (!hcancel)
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hcancel = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
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else
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ResetEvent (hcancel);
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if (!syncthread)
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syncthread = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
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else
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ResetEvent (syncthread);
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new cygthread (timer_thread, this, "itimer", syncthread);
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}
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ret = 0;
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}
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__except (EFAULT) {}
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__endtry
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return ret;
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}
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void
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timer_tracker::gettime (itimerspec *ovalue)
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{
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if (!hcancel)
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memset (ovalue, 0, sizeof (*ovalue));
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else
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{
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ovalue->it_interval = it_interval;
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long long now = gtod.usecs ();
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long long left_us = sleepto_us - now;
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if (left_us < 0)
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left_us = 0;
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ovalue->it_value.tv_sec = left_us / 1000000;
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ovalue->it_value.tv_nsec = (left_us % 1000000) * 1000;
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}
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}
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extern "C" int
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timer_gettime (timer_t timerid, struct itimerspec *ovalue)
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{
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int ret = -1;
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__try
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{
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timer_tracker *tt = (timer_tracker *) timerid;
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if (tt->magic != TT_MAGIC)
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{
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set_errno (EINVAL);
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return -1;
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}
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tt->gettime (ovalue);
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ret = 0;
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}
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__except (EFAULT) {}
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__endtry
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return ret;
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}
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extern "C" int
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timer_create (clockid_t clock_id, struct sigevent *__restrict evp,
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timer_t *__restrict timerid)
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{
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int ret = -1;
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__try
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{
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if (CLOCKID_IS_PROCESS (clock_id) || CLOCKID_IS_THREAD (clock_id))
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{
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set_errno (ENOTSUP);
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return -1;
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}
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if (clock_id != CLOCK_REALTIME)
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{
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set_errno (EINVAL);
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return -1;
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}
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*timerid = (timer_t) new timer_tracker (clock_id, evp);
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ret = 0;
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}
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__except (EFAULT) {}
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__endtry
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return ret;
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}
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extern "C" int
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timer_settime (timer_t timerid, int flags,
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const struct itimerspec *__restrict value,
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struct itimerspec *__restrict ovalue)
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{
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int ret = -1;
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__try
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{
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timer_tracker *tt = (timer_tracker *) timerid;
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if (tt->magic != TT_MAGIC)
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{
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set_errno (EINVAL);
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__leave;
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}
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ret = tt->settime (flags, value, ovalue);
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}
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__except (EFAULT) {}
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__endtry
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return ret;
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}
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extern "C" int
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timer_delete (timer_t timerid)
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{
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int ret = -1;
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__try
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{
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timer_tracker *in_tt = (timer_tracker *) timerid;
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if (in_tt->magic != TT_MAGIC)
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{
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set_errno (EINVAL);
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__leave;
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}
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lock_timer_tracker here;
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for (timer_tracker *tt = &ttstart; tt->next != NULL; tt = tt->next)
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if (tt->next == in_tt)
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{
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tt->next = in_tt->next;
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delete in_tt;
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ret = 0;
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__leave;
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}
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set_errno (EINVAL);
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ret = 0;
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}
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__except (EFAULT) {}
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__endtry
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return ret;
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}
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void
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fixup_timers_after_fork ()
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{
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ttstart.hcancel = ttstart.syncthread = NULL;
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for (timer_tracker *tt = &ttstart; tt->next != NULL; /* nothing */)
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{
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timer_tracker *deleteme = tt->next;
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tt->next = deleteme->next;
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deleteme->hcancel = deleteme->syncthread = NULL;
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delete deleteme;
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}
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}
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extern "C" int
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setitimer (int which, const struct itimerval *__restrict value,
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struct itimerval *__restrict ovalue)
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{
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int ret;
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if (which != ITIMER_REAL)
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{
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set_errno (EINVAL);
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ret = -1;
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}
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else
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{
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struct itimerspec spec_value, spec_ovalue;
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spec_value.it_interval.tv_sec = value->it_interval.tv_sec;
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spec_value.it_interval.tv_nsec = value->it_interval.tv_usec * 1000;
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spec_value.it_value.tv_sec = value->it_value.tv_sec;
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spec_value.it_value.tv_nsec = value->it_value.tv_usec * 1000;
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ret = timer_settime ((timer_t) &ttstart, 0, &spec_value, &spec_ovalue);
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if (ret)
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ret = -1;
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else if (ovalue)
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{
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ovalue->it_interval.tv_sec = spec_ovalue.it_interval.tv_sec;
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ovalue->it_interval.tv_usec = spec_ovalue.it_interval.tv_nsec / 1000;
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ovalue->it_value.tv_sec = spec_ovalue.it_value.tv_sec;
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ovalue->it_value.tv_usec = spec_ovalue.it_value.tv_nsec / 1000;
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}
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}
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syscall_printf ("%R = setitimer()", ret);
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return ret;
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}
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extern "C" int
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getitimer (int which, struct itimerval *ovalue)
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{
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int ret = -1;
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if (which != ITIMER_REAL)
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set_errno (EINVAL);
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else
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{
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__try
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{
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struct itimerspec spec_ovalue;
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ret = timer_gettime ((timer_t) &ttstart, &spec_ovalue);
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if (!ret)
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{
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ovalue->it_interval.tv_sec = spec_ovalue.it_interval.tv_sec;
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ovalue->it_interval.tv_usec = spec_ovalue.it_interval.tv_nsec / 1000;
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ovalue->it_value.tv_sec = spec_ovalue.it_value.tv_sec;
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ovalue->it_value.tv_usec = spec_ovalue.it_value.tv_nsec / 1000;
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}
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}
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__except (EFAULT) {}
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__endtry
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}
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syscall_printf ("%R = getitimer()", ret);
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return ret;
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}
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/* FIXME: POSIX - alarm survives exec */
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extern "C" unsigned int
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alarm (unsigned int seconds)
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{
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struct itimerspec newt = {}, oldt;
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/* alarm cannot fail, but only needs not be
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correct for arguments < 64k. Truncate */
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if (seconds > (HIRES_DELAY_MAX / 1000 - 1))
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seconds = (HIRES_DELAY_MAX / 1000 - 1);
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newt.it_value.tv_sec = seconds;
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timer_settime ((timer_t) &ttstart, 0, &newt, &oldt);
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int ret = oldt.it_value.tv_sec + (oldt.it_value.tv_nsec > 0);
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syscall_printf ("%d = alarm(%u)", ret, seconds);
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return ret;
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}
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extern "C" useconds_t
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ualarm (useconds_t value, useconds_t interval)
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{
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struct itimerspec timer = {}, otimer;
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/* ualarm cannot fail.
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Interpret negative arguments as zero */
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if (value > 0)
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{
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timer.it_value.tv_sec = value / 1000000;
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timer.it_value.tv_nsec = (value % 1000000) * 1000;
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}
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if (interval > 0)
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{
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timer.it_interval.tv_sec = interval / 1000000;
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timer.it_interval.tv_nsec = (interval % 1000000) * 1000;
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}
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timer_settime ((timer_t) &ttstart, 0, &timer, &otimer);
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useconds_t ret = otimer.it_value.tv_sec * 1000000 + (otimer.it_value.tv_nsec + 999) / 1000;
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syscall_printf ("%d = ualarm(%ld , %ld)", ret, value, interval);
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return ret;
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}
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