Implement multithreading for function calls
Each of the EC::Manager's function calls over entities can now be multi-threaded.
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3 changed files with 264 additions and 22 deletions
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@ -17,6 +17,7 @@ set(EntityComponentSystem_HEADERS
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EC/EC.hpp)
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add_library(EntityComponentSystem INTERFACE)
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target_link_libraries(EntityComponentSystem INTERFACE pthread)
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target_include_directories(EntityComponentSystem INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
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@ -20,6 +20,7 @@
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#include <set>
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#include <unordered_set>
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#include <algorithm>
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#include <thread>
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#include "Meta/Combine.hpp"
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#include "Meta/Matching.hpp"
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@ -500,18 +501,29 @@ namespace EC
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parameters. Tags specified in the Signature are only used as
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filters and will not be given as a parameter to the function.
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The second parameter is default 1 (not multi-threaded). If the
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second parameter threadCount is set to a value greater than 1, then
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threadCount threads will be used.
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Note that multi-threading is based on splitting the task of calling
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the function across sections of entities. Thus if there are only
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a small amount of entities in the manager, then using multiple
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threads may not have as great of a speed-up.
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Example:
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\code{.cpp}
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manager.forMatchingSignature<TypeList<C0, C1, T0>>([] (
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std::size_t ID, C0& component0, C1& component1) {
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// Lambda function contents here
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});
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},
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4 // four threads
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);
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\endcode
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Note, the ID given to the function is not permanent. An entity's ID
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may change when cleanup() is called.
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*/
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template <typename Signature, typename Function>
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void forMatchingSignature(Function&& function)
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void forMatchingSignature(Function&& function,
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std::size_t threadCount = 1)
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{
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using SignatureComponents =
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typename EC::Meta::Matching<Signature, ComponentsList>::type;
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@ -522,23 +534,70 @@ namespace EC
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BitsetType signatureBitset =
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BitsetType::template generateBitset<Signature>();
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for(std::size_t i = 0; i < currentSize; ++i)
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if(threadCount <= 1)
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{
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if(!std::get<bool>(entities[i]))
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for(std::size_t i = 0; i < currentSize; ++i)
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{
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continue;
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}
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if(!std::get<bool>(entities[i]))
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{
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continue;
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}
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if((signatureBitset & std::get<BitsetType>(entities[i]))
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== signatureBitset)
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if((signatureBitset & std::get<BitsetType>(entities[i]))
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== signatureBitset)
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{
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Helper::call(i, *this,
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std::forward<Function>(function));
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}
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}
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}
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else
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{
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std::thread threads[threadCount];
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std::size_t s = currentSize / threadCount;
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for(std::size_t i = 0; i < threadCount; ++i)
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{
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Helper::call(i, *this, std::forward<Function>(function));
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std::size_t begin = s * i;
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std::size_t end;
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if(i == threadCount - 1)
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{
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end = currentSize;
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}
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else
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{
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end = s * (i + 1);
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}
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threads[i] = std::thread([this, &function, &signatureBitset]
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(std::size_t begin,
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std::size_t end) {
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for(std::size_t i = begin; i < end; ++i)
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{
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if(!std::get<bool>(this->entities[i]))
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{
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continue;
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}
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if((signatureBitset
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& std::get<BitsetType>(entities[i]))
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== signatureBitset)
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{
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Helper::call(i, *this,
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std::forward<Function>(function));
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}
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}
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},
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begin,
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end);
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}
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for(std::size_t i = 0; i < threadCount; ++i)
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{
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threads[i].join();
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}
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}
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}
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private:
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std::unordered_map<std::size_t, std::function<void()> >
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std::unordered_map<std::size_t, std::function<void(std::size_t)> >
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forMatchingFunctions;
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std::size_t functionIndex = 0;
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@ -602,19 +661,64 @@ namespace EC
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forMatchingFunctions.emplace(std::make_pair(
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functionIndex,
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[function, signatureBitset, helper, this] ()
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[function, signatureBitset, helper, this]
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(std::size_t threadCount)
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{
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for(std::size_t i = 0; i < this->currentSize; ++i)
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if(threadCount <= 1)
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{
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if(!std::get<bool>(this->entities[i]))
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for(std::size_t i = 0; i < this->currentSize; ++i)
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{
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continue;
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if(!std::get<bool>(this->entities[i]))
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{
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continue;
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}
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if((signatureBitset
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& std::get<BitsetType>(this->entities[i]))
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== signatureBitset)
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{
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helper.callInstance(i, *this, function);
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}
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}
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if((signatureBitset
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& std::get<BitsetType>(this->entities[i]))
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== signatureBitset)
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}
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else
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{
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std::thread threads[threadCount];
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std::size_t s = this->currentSize / threadCount;
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for(std::size_t i = 0; i < threadCount; ++ i)
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{
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helper.callInstance(i, *this, function);
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std::size_t begin = s * i;
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std::size_t end;
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if(i == threadCount - 1)
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{
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end = this->currentSize;
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}
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else
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{
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end = s * (i + 1);
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}
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threads[i] = std::thread(
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[this, &function, &signatureBitset, &helper]
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(std::size_t begin,
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std::size_t end) {
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for(std::size_t i = begin; i < end; ++i)
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{
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if(!std::get<bool>(this->entities[i]))
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{
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continue;
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}
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if((signatureBitset
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& std::get<BitsetType>(this->entities[i]))
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== signatureBitset)
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{
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helper.callInstance(i, *this, function);
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}
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}
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},
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begin, end);
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}
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for(std::size_t i = 0; i < threadCount; ++i)
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{
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threads[i].join();
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}
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}
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}));
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@ -625,6 +729,14 @@ namespace EC
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/*!
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\brief Call all stored functions.
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A second parameter can be optionally used to specify the number
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of threads to use when calling the functions. Otherwise, this
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function is by default not multi-threaded.
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Note that multi-threading is based on splitting the task of calling
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the functions across sections of entities. Thus if there are only
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a small amount of entities in the manager, then using multiple
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threads may not have as great of a speed-up.
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Example:
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\code{.cpp}
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manager.addForMatchingFunction<TypeList<C0, C1, T0>>([] (
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@ -635,23 +747,34 @@ namespace EC
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// call all stored functions
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manager.callForMatchingFunctions();
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// call all stored functions with 4 threads
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manager.callForMatchingFunctions(4);
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// remove all stored functions
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manager.clearForMatchingFunctions();
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\endcode
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*/
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void callForMatchingFunctions()
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void callForMatchingFunctions(std::size_t threadCount = 1)
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{
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for(auto functionIter = forMatchingFunctions.begin();
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functionIter != forMatchingFunctions.end();
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++functionIter)
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{
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functionIter->second();
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functionIter->second(threadCount);
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}
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}
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/*!
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\brief Call a specific stored function.
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A second parameter can be optionally used to specify the number
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of threads to use when calling the function. Otherwise, this
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function is by default not multi-threaded.
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Note that multi-threading is based on splitting the task of calling
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the function across sections of entities. Thus if there are only
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a small amount of entities in the manager, then using multiple
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threads may not have as great of a speed-up.
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Example:
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\code{.cpp}
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std::size_t id =
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@ -662,18 +785,22 @@ namespace EC
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// call the previously added function
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manager.callForMatchingFunction(id);
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// call the previously added function with 4 threads
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manager.callForMatchingFunction(id, 4);
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\endcode
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\return False if a function with the given id does not exist.
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*/
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bool callForMatchingFunction(std::size_t id)
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bool callForMatchingFunction(std::size_t id,
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std::size_t threadCount = 1)
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{
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auto iter = forMatchingFunctions.find(id);
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if(iter == forMatchingFunctions.end())
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{
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return false;
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}
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iter->second();
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iter->second(threadCount);
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return true;
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}
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@ -458,3 +458,117 @@ TEST(EC, DeletedEntityID)
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EXPECT_TRUE(manager.hasEntity(0));
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}
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TEST(EC, MultiThreaded)
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{
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EC::Manager<ListComponentsAll, ListTagsAll> manager;
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for(unsigned int i = 0; i < 17; ++i)
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{
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manager.addEntity();
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manager.addComponent<C0>(i, 0, 0);
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EXPECT_EQ(0, manager.getEntityData<C0>(i).x);
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EXPECT_EQ(0, manager.getEntityData<C0>(i).y);
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}
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manager.forMatchingSignature<EC::Meta::TypeList<C0> >(
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[] (const std::size_t& eid, C0& c) {
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c.x = 1;
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c.y = 2;
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}
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);
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for(unsigned int i = 0; i < 17; ++i)
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{
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EXPECT_EQ(1, manager.getEntityData<C0>(i).x);
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EXPECT_EQ(2, manager.getEntityData<C0>(i).y);
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}
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for(unsigned int i = 3; i < 17; ++i)
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{
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manager.deleteEntity(i);
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}
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manager.cleanup();
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for(unsigned int i = 0; i < 3; ++i)
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{
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EXPECT_EQ(1, manager.getEntityData<C0>(i).x);
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EXPECT_EQ(2, manager.getEntityData<C0>(i).y);
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}
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manager.forMatchingSignature<EC::Meta::TypeList<C0> >(
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[] (const std::size_t& eid, C0& c) {
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c.x = 3;
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c.y = 4;
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},
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8
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);
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for(unsigned int i = 0; i < 3; ++i)
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{
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EXPECT_EQ(3, manager.getEntityData<C0>(i).x);
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EXPECT_EQ(4, manager.getEntityData<C0>(i).y);
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}
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manager.reset();
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for(unsigned int i = 0; i < 17; ++i)
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{
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manager.addEntity();
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manager.addComponent<C0>(i, 0, 0);
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EXPECT_EQ(0, manager.getEntityData<C0>(i).x);
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EXPECT_EQ(0, manager.getEntityData<C0>(i).y);
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}
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auto f0 = manager.addForMatchingFunction<EC::Meta::TypeList<C0> >(
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[] (const std::size_t& eid, C0& c) {
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c.x = 1;
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c.y = 2;
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}
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);
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manager.callForMatchingFunctions(2);
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for(unsigned int i = 0; i < 17; ++i)
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{
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EXPECT_EQ(1, manager.getEntityData<C0>(i).x);
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EXPECT_EQ(2, manager.getEntityData<C0>(i).y);
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}
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auto f1 = manager.addForMatchingFunction<EC::Meta::TypeList<C0> >(
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[] (const std::size_t& eid, C0& c) {
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c.x = 3;
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c.y = 4;
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}
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);
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manager.callForMatchingFunction(f1, 4);
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for(unsigned int i = 0; i < 17; ++i)
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{
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EXPECT_EQ(3, manager.getEntityData<C0>(i).x);
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EXPECT_EQ(4, manager.getEntityData<C0>(i).y);
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}
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for(unsigned int i = 4; i < 17; ++i)
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{
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manager.deleteEntity(i);
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}
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manager.cleanup();
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manager.callForMatchingFunction(f0, 8);
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for(unsigned int i = 0; i < 4; ++i)
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{
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EXPECT_EQ(1, manager.getEntityData<C0>(i).x);
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EXPECT_EQ(2, manager.getEntityData<C0>(i).y);
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}
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manager.callForMatchingFunction(f1, 8);
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for(unsigned int i = 0; i < 4; ++i)
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{
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EXPECT_EQ(3, manager.getEntityData<C0>(i).x);
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EXPECT_EQ(4, manager.getEntityData<C0>(i).y);
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}
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}
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