int main()
{
uint64_t startTick, endTick, hSeconds;
for(int i = 0; i < 20; i++) {
startTick = ArchGetTickTime();
ArchNap(NAPTIME);
endTick = ArchGetTickTime();
hSeconds = ArchTicksToNanoseconds(endTick - startTick) / 10000000;
if(hSeconds < MINNAPTIME || hSeconds > MAXNAPTIME) {
ARCH_ERROR("ArchTiming failed, possibly due to a "
"process being swapped out. Try running "
"it again, and if does not fail "
"consistently it's ok to ignore this.");
}
}
ArchNap(0);
uint64_t ticks = ArchGetTickTime();
assert( (uint64_t) ArchTicksToNanoseconds(ticks) ==
uint64_t(static_cast<double>(ticks)*ArchGetNanosecondsPerTick() + .5));
double nanos = double(ArchTicksToNanoseconds(ticks)) / 1e9;
double secs = ArchTicksToSeconds(ticks);
double epsilon = 0.0001;
assert( (nanos - epsilon <= secs) && (nanos + epsilon >= secs) );
return 0;
}
ARCH_HIDDEN
void
Arch_ValidateAssumptions()
{
enum SomeEnum { BLAH };
/*
* We do an atomic compare-and-swap on enum's, treating then as ints,
* so we are assuming that an enum is the same size as an int.
*/
if (sizeof(SomeEnum) != sizeof(int))
ARCH_ERROR("sizeof(enum) != sizeof(int)");
if (sizeof(int) != 4)
ARCH_ERROR("sizeof(int) != 4");
/*
* Verify that the exponent and significand of float and double are
* IEEE-754 compliant.
*/
if (sizeof(float) != sizeof(uint32_t) ||
ArchFloatToBitPattern(5.6904566e-28f) != 0x12345678 ||
ArchBitPatternToFloat(0x12345678) != 5.6904566e-28f)
{
// CODE_COVERAGE_OFF
ARCH_ERROR("float is not IEEE-754 compliant");
//CODE_COVERAGE_ON
}
if (sizeof(double) != sizeof(uint64_t) ||
ArchDoubleToBitPattern(
5.6263470058989390e-221) != 0x1234567811223344ULL ||
ArchBitPatternToDouble(
0x1234567811223344ULL) != 5.6263470058989390e-221)
{
// CODE_COVERAGE_OFF
ARCH_ERROR("double is not IEEE-754 compliant");
//CODE_COVERAGE_ON
}
/*
* Lots of things depend on characters being able to compare with EOF.
*/
int ic = EOF;
char c = ic;
if (c != EOF) {
// CODE_COVERAGE_OFF
ARCH_ERROR("testing a char against EOF fails");
//CODE_COVERAGE_ON
}
/*
* Check the demangler on a very simple type.
*/
if (ArchGetDemangled<int>() != "int") {
// CODE_COVERAGE_OFF
ARCH_ERROR("C++ demangling is badly broken.");
// CODE_COVERAGE_ON
}
/*
* Make sure that the ARCH_CACHE_LINE_SIZE constant is set as expected
* on the current hardware architecture.
*/
if (ARCH_CACHE_LINE_SIZE != Arch_ObtainCacheLineSize()) {
// CODE_COVERAGE_OFF
ARCH_ERROR("ARCH_CACHE_LINE_SIZE is not set correctly.");
// CODE_COVERAGE_ON
}
}