| 92 | */ |
| 93 | |
| 94 | std::pair<int, SignalInformation> waitImplementation(const SignalSet& signalSet, const bool nonBlocking, |
| 95 | const TickClock::time_point* const timePoint) |
| 96 | { |
| 97 | CHECK_FUNCTION_CONTEXT(); |
| 98 | |
| 99 | auto& scheduler = internal::getScheduler(); |
| 100 | const auto signalsReceiverControlBlock = scheduler.getCurrentThreadControlBlock().getSignalsReceiverControlBlock(); |
| 101 | if (signalsReceiverControlBlock == nullptr) |
| 102 | return {ENOTSUP, SignalInformation{uint8_t{}, SignalInformation::Code{}, sigval{}}}; |
| 103 | |
| 104 | const InterruptMaskingLock interruptMaskingLock; |
| 105 | |
| 106 | const auto bitset = signalSet.getBitset(); |
| 107 | auto pendingSignalSet = signalsReceiverControlBlock->getPendingSignalSet(); |
| 108 | auto pendingBitset = pendingSignalSet.getBitset(); |
| 109 | auto intersection = bitset & pendingBitset; |
| 110 | |
| 111 | if (intersection.none() == true) // none of desired signals is pending, so current thread must be blocked |
| 112 | { |
| 113 | if (nonBlocking == true) |
| 114 | return {EAGAIN, SignalInformation{uint8_t{}, SignalInformation::Code{}, sigval{}}}; |
| 115 | |
| 116 | internal::ThreadList waitingList; |
| 117 | |
| 118 | signalsReceiverControlBlock->setWaitingSignalSet(&signalSet); |
| 119 | const SignalsWaitUnblockFunctor signalsWaitUnblockFunctor; |
| 120 | const auto ret = timePoint == nullptr ? |
| 121 | scheduler.block(waitingList, ThreadState::waitingForSignal, &signalsWaitUnblockFunctor) : |
| 122 | scheduler.blockUntil(waitingList, ThreadState::waitingForSignal, *timePoint, |
| 123 | &signalsWaitUnblockFunctor); |
| 124 | if (ret != 0) |
| 125 | return {ret, SignalInformation{uint8_t{}, SignalInformation::Code{}, sigval{}}}; |
| 126 | |
| 127 | pendingSignalSet = signalsReceiverControlBlock->getPendingSignalSet(); |
| 128 | pendingBitset = pendingSignalSet.getBitset(); |
| 129 | intersection = bitset & pendingBitset; |
| 130 | } |
| 131 | |
| 132 | const auto intersectionValue = intersection.to_ulong(); |
| 133 | static_assert(sizeof(intersectionValue) == intersection.size() / 8, |
| 134 | "Size of intersectionValue doesn't match size of intersection!"); |
| 135 | // GCC builtin - "find first set" - https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html |
| 136 | const auto signalNumber = __builtin_ffsl(intersectionValue) - 1; |
| 137 | return signalsReceiverControlBlock->acceptPendingSignal(signalNumber); |
| 138 | } |
| 139 | |
| 140 | } // namespace |
| 141 |
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