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#include "tbb_local_executor.h"
template <bool RespectTls>
void NPar::TTbbLocalExecutor<RespectTls>::SubmitAsyncTasks(TLocallyExecutableFunction exec, int firstId, int lastId) {
for (int i = firstId; i < lastId; ++i) {
Group.run([=] { exec(i); });
}
}
template <bool RespectTls>
int NPar::TTbbLocalExecutor<RespectTls>::GetThreadCount() const noexcept {
return NumberOfTbbThreads - 1;
}
template <bool RespectTls>
int NPar::TTbbLocalExecutor<RespectTls>::GetWorkerThreadId() const noexcept {
static thread_local int WorkerThreadId = -1;
if (WorkerThreadId == -1) {
// Can't rely on return value except checking that it is 'not_initialized' because of
// "Since a thread may exit the arena at any time if it does not execute a task, the index of
// a thread may change between any two tasks"
// (https://oneapi-spec.uxlfoundation.org/specifications/oneapi/latest/elements/onetbb/source/task_scheduler/task_arena/this_task_arena_ns#_CPPv4N3tbb15this_task_arena20current_thread_indexEv)
const auto tbbThreadIndex = tbb::this_task_arena::current_thread_index();
if (tbbThreadIndex == tbb::task_arena::not_initialized) {
// This thread does not belong to TBB worker threads
WorkerThreadId = 0;
} else {
WorkerThreadId = ++RegisteredThreadCounter;
}
}
return WorkerThreadId;
}
template <bool RespectTls>
void NPar::TTbbLocalExecutor<RespectTls>::Exec(TIntrusivePtr<ILocallyExecutable> exec, int id, int flags) {
if (flags & WAIT_COMPLETE) {
exec->LocalExec(id);
} else {
TbbArena.execute([this, exec, id] {
SubmitAsyncTasks([=] (int id) { exec->LocalExec(id); }, id, id + 1);
});
}
}
template <bool RespectTls>
void NPar::TTbbLocalExecutor<RespectTls>::ExecRange(TIntrusivePtr<ILocallyExecutable> exec, int firstId, int lastId, int flags) {
if (flags & WAIT_COMPLETE) {
TbbArena.execute([=] {
if (RespectTls) {
tbb::this_task_arena::isolate([=]{
tbb::parallel_for(firstId, lastId, [=] (int id) { exec->LocalExec(id); });
});
} else {
tbb::parallel_for(firstId, lastId, [=] (int id) { exec->LocalExec(id); });
}
});
} else {
TbbArena.execute([this, exec, firstId, lastId] {
SubmitAsyncTasks([exec] (int id) { exec->LocalExec(id); }, firstId, lastId);
});
}
}
template class NPar::TTbbLocalExecutor<true>;
template class NPar::TTbbLocalExecutor<false>;
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