void FailPoint::setMode(Mode mode, ValType val, const BSONObj& extra) {
/**
* Outline:
*
* 1. Deactivates fail point to enter write-only mode
* 2. Waits for all current readers of the fail point to finish
* 3. Sets the new mode.
*/
stdx::lock_guard<stdx::mutex> scoped(_modMutex);
// Step 1
disableFailPoint();
// Step 2
while (_fpInfo.load() != 0) {
sleepmillis(50);
}
_mode = mode;
_timesOrPeriod.store(val);
_data = extra.copy();
if (_mode != off) {
enableFailPoint();
}
}
void FailPoint::setMode(Mode mode, ValType val, const BSONObj& extra) {
/**
* Outline:
*
* 1. Deactivates fail point to enter write-only mode
* 2. Waits for all current readers of the fail point to finish
* 3. Sets the new mode.
*/
scoped_lock scoped(_modMutex);
// Step 1
disableFailPoint();
// Step 2
while (_fpInfo.load() != 0) {
sleepmillis(50);
}
// Step 3
uassert(16442, stream() << "mode not supported " << static_cast<int>(mode),
mode >= off && mode < numModes);
_mode = mode;
_timesOrPeriod.store(val);
_data = extra.copy();
if (_mode != off) {
enableFailPoint();
}
}
FailPoint::RetCode FailPoint::slowShouldFailOpenBlock() {
ValType localFpInfo = _fpInfo.addAndFetch(1);
if ((localFpInfo & ACTIVE_BIT) == 0) {
return slowOff;
}
switch (_mode) {
case alwaysOn:
return slowOn;
case random: {
const AtomicInt32::WordType maxActivationValue = _timesOrPeriod.load();
if (prngNextPositiveInt32() < maxActivationValue) {
return slowOn;
}
return slowOff;
}
case nTimes: {
AtomicInt32::WordType newVal = _timesOrPeriod.subtractAndFetch(1);
if (newVal <= 0) {
disableFailPoint();
}
return slowOn;
}
default:
error() << "FailPoint Mode not supported: " << static_cast<int>(_mode);
fassertFailed(16444);
}
}
FailPoint::RetCode FailPoint::slowShouldFailOpenBlock() {
ValType localFpInfo = _fpInfo.addAndFetch(1);
if ((localFpInfo & ACTIVE_BIT) == 0) {
return slowOff;
}
switch (_mode) {
case alwaysOn:
return slowOn;
case random:
// TODO: randomly determine if should be active or not
error() << "FailPoint Mode random is not yet supported." << endl;
fassertFailed(16443);
case nTimes:
{
AtomicInt32::WordType newVal = _timesOrPeriod.subtractAndFetch(1);
if (newVal <= 0) {
disableFailPoint();
}
return slowOn;
}
default:
error() << "FailPoint Mode not supported: " << static_cast<int>(_mode) << endl;
fassertFailed(16444);
}
}
