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/* cygwait.h
Copyright 2011, 2012, 2013, 2015 Red Hat, Inc.
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. */
#include "winsup.h"
#include "sigproc.h"
#include "cygwait.h"
#include "ntdll.h"
#define is_cw_cancel (mask & cw_cancel)
#define is_cw_cancel_self (mask & cw_cancel_self)
#define is_cw_sig (mask & cw_sig)
#define is_cw_sig_eintr (mask & cw_sig_eintr)
#define is_cw_sig_cont (mask & cw_sig_cont)
#define is_cw_sig_restart (mask & cw_sig_restart)
#define is_cw_sig_handle (mask & (cw_sig | cw_sig_eintr \
| cw_sig_cont | cw_sig_restart))
LARGE_INTEGER cw_nowait_storage;
DWORD
cygwait (HANDLE object, PLARGE_INTEGER timeout, unsigned mask)
{
DWORD res;
DWORD num = 0;
HANDLE wait_objects[4];
pthread_t thread = pthread::self ();
/* Do not change the wait order.
The object must have higher priority than the cancel event,
because WaitForMultipleObjects will return the smallest index
if both objects are signaled. */
if (object)
wait_objects[num++] = object;
wait_signal_arrived thread_waiting (is_cw_sig_handle, wait_objects[num]);
debug_only_printf ("object %p, thread waiting %d, signal_arrived %p", object, (int) thread_waiting, _my_tls.signal_arrived);
DWORD sig_n;
if (!thread_waiting)
sig_n = WAIT_TIMEOUT + 1;
else
sig_n = WAIT_OBJECT_0 + num++;
DWORD cancel_n;
if (!is_cw_cancel || !pthread::is_good_object (&thread) ||
thread->cancelstate == PTHREAD_CANCEL_DISABLE)
cancel_n = WAIT_TIMEOUT + 1;
else
{
cancel_n = WAIT_OBJECT_0 + num++;
wait_objects[cancel_n] = thread->cancel_event;
}
DWORD timeout_n;
if (!timeout)
timeout_n = WAIT_TIMEOUT + 1;
else
{
timeout_n = WAIT_OBJECT_0 + num++;
if (!_my_tls.locals.cw_timer)
NtCreateTimer (&_my_tls.locals.cw_timer, TIMER_ALL_ACCESS, NULL,
NotificationTimer);
NtSetTimer (_my_tls.locals.cw_timer, timeout, NULL, NULL, FALSE, 0, NULL);
wait_objects[timeout_n] = _my_tls.locals.cw_timer;
}
while (1)
{
res = WaitForMultipleObjects (num, wait_objects, FALSE, INFINITE);
debug_only_printf ("res %d", res);
if (res == cancel_n)
res = WAIT_CANCELED;
else if (res == timeout_n)
res = WAIT_TIMEOUT;
else if (res != sig_n)
/* all set */;
else
{
int sig = _my_tls.sig;
if (is_cw_sig_cont && sig == SIGCONT)
_my_tls.sig = 0;
if (!sig)
continue;
if (is_cw_sig_eintr || (is_cw_sig_cont && sig == SIGCONT))
;
else if (_my_tls.call_signal_handler () || is_cw_sig_restart)
continue;
res = WAIT_SIGNALED; /* caller will deal with signals */
}
break;
}
if (timeout)
{
TIMER_BASIC_INFORMATION tbi;
NtQueryTimer (_my_tls.locals.cw_timer, TimerBasicInformation, &tbi,
sizeof tbi, NULL);
/* if timer expired, TimeRemaining is negative and represents the
system uptime when signalled */
if (timeout->QuadPart < 0LL)
timeout->QuadPart = tbi.SignalState ? 0LL : tbi.TimeRemaining.QuadPart;
NtCancelTimer (_my_tls.locals.cw_timer, NULL);
}
if (res == WAIT_CANCELED && is_cw_cancel_self)
pthread::static_cancel_self ();
return res;
}
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