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Cygwin: timers: drop error handling for Windows perf timer functions 

Per MSDN, the perf timer functions always succeed on Windows XP or
later.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2018-11-26 17:38:15 +01:00
parent 65091f0f35
commit 161d0fd27b
1 changed files with 7 additions and 30 deletions
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37
winsup/cygwin/times.cc
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@ -466,21 +466,14 @@ void
hires_ns::prime ()
{
LARGE_INTEGER ifreq;
if (!QueryPerformanceFrequency (&ifreq))
{
inited = -1;
return;
}
/* On XP or later the perf counter functions will always succeed. */
QueryPerformanceFrequency (&ifreq);
int priority = GetThreadPriority (GetCurrentThread ());
SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_TIME_CRITICAL);
if (!QueryPerformanceCounter (&primed_pc))
{
SetThreadPriority (GetCurrentThread (), priority);
inited = -1;
return;
}
QueryPerformanceCounter (&primed_pc);
freq = (double) ((double) NSPERSEC / (double) ifreq.QuadPart);
inited = true;
@ -490,21 +483,11 @@ hires_ns::prime ()
LONGLONG
hires_ns::nsecs (bool monotonic)
{
LARGE_INTEGER now;
if (!inited)
prime ();
if (inited < 0)
{
set_errno (ENOSYS);
return (LONGLONG) -1;
}
LARGE_INTEGER now;
if (!QueryPerformanceCounter (&now))
{
set_errno (ENOSYS);
return -1;
}
QueryPerformanceCounter (&now);
// FIXME: Use round() here?
now.QuadPart = (LONGLONG) (freq * (double)
(now.QuadPart - (monotonic ? 0LL : primed_pc.QuadPart)));
@ -646,12 +629,6 @@ hires_ns::resolution ()
{
if (!inited)
prime ();
if (inited < 0)
{
set_errno (ENOSYS);
return (LONGLONG) -1;
}
return (freq <= 1.0) ? 1LL : (LONGLONG) freq;
}