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Fixes MotorSafetyHelper locking and race conditions (#762)

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Closes #760
This commit is contained in:
Thad House
2017-11-23 00:36:57 -08:00
committed by Peter Johnson
parent 614093c0c4
commit d36d72bd4f
4 changed files with 63 additions and 23 deletions
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16
wpilibc/src/main/native/cpp/MotorSafetyHelper.cpp
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@@ -96,11 +96,19 @@ bool MotorSafetyHelper::IsAlive() const {
* shut down until its value is updated again.
*/
void MotorSafetyHelper::Check() {
DriverStation& ds = DriverStation::GetInstance();
if (!m_enabled || ds.IsDisabled() || ds.IsTest()) return;
bool enabled;
double stopTime;
std::lock_guard<wpi::mutex> lock(m_thisMutex);
if (m_stopTime < Timer::GetFPGATimestamp()) {
{
std::lock_guard<wpi::mutex> lock(m_thisMutex);
enabled = m_enabled;
stopTime = m_stopTime;
}
DriverStation& ds = DriverStation::GetInstance();
if (!enabled || ds.IsDisabled() || ds.IsTest()) return;
if (stopTime < Timer::GetFPGATimestamp()) {
llvm::SmallString<128> buf;
llvm::raw_svector_ostream desc(buf);
m_safeObject->GetDescription(desc);