forked from OctaForge/libostd
dispatch directly from start when using bscs
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f3984f6412
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a04db12d49
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@ -271,23 +271,40 @@ public:
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size_t ss = TR::default_size(),
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size_t cs = basic_stack_pool<TR, Protected>::DEFAULT_CHUNK_SIZE
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):
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p_stacks(ss, cs),
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p_dispatcher([this]() {
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dispatch();
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}, p_stacks.get_allocator()),
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p_coros()
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p_stacks(ss, cs), p_coros()
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{}
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template<typename F, typename ...A>
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auto start(F &&func, A &&...args) -> std::result_of_t<F(A...)> {
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detail::sched_iface_owner iface{*this};
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using R = std::result_of_t<F(A...)>;
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basic_fixedsize_stack<TR, Protected> sa{detail::stack_main_size()};
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if constexpr(std::is_same_v<R, void>) {
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func(std::forward<A>(args)...);
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finish();
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if constexpr(sizeof...(A) == 0) {
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p_coros.emplace_back(std::forward<F>(func), sa);
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} else {
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auto ret = func(std::forward<A>(args)...);
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finish();
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p_coros.emplace_back(std::bind(
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std::forward<F>(func), std::forward<A>(args)...
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), sa);
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}
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dispatch();
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} else {
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R ret;
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if constexpr(sizeof...(A) == 0) {
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p_coros.emplace_back([&ret, lfunc = std::forward<F>(func)] {
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ret = lfunc();
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}, sa);
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} else {
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p_coros.emplace_back([&ret, lfunc = std::bind(
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std::forward<F>(func), std::forward<A>(args)...
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)]() {
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ret = lfunc();
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}, sa);
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}
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dispatch();
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return ret;
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}
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}
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@ -297,14 +314,7 @@ public:
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}
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void yield() {
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auto ctx = detail::csched_task::current();
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if (!ctx) {
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/* yield from main means go to dispatcher and call first task */
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p_idx = p_coros.begin();
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p_dispatcher();
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return;
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}
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ctx->yield();
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detail::csched_task::current()->yield();
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}
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generic_condvar make_condition() {
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@ -316,12 +326,7 @@ private:
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void dispatch() {
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while (!p_coros.empty()) {
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if (p_idx == p_coros.end()) {
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/* we're at the end; it's time to return to main and
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* continue there (potential yield from main results
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* in continuing from this point with the first task)
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*/
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detail::csched_task::current()->yield();
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continue;
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p_idx = p_coros.begin();
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}
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(*p_idx)();
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if (p_idx->dead()) {
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@ -332,18 +337,7 @@ private:
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}
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}
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void finish() {
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/* main has finished, but there might be either suspended or never
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* started tasks in the queue; dispatch until there are none left
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*/
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while (!p_coros.empty()) {
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p_idx = p_coros.begin();
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p_dispatcher();
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}
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}
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basic_stack_pool<TR, Protected> p_stacks;
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detail::csched_task p_dispatcher;
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std::list<detail::csched_task> p_coros;
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typename std::list<detail::csched_task>::iterator p_idx = p_coros.end();
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};
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