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97 líneas
2.2 KiB
97 líneas
2.2 KiB
#pragma once
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#include "gp/vfs/system.hpp"
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namespace gp{
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class simple_scheduling : public gp::scheduling_scheme {
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struct locked_circular_buffer {
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std::atomic_bool lock;
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gp::array<gp::topic_list::node_ptr, gp_config::limits::max_processes> processes;
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size_t read_idx = 0;
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size_t write_idx = 0;
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void push(gp::topic_list::node_ptr node) {
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bool t = true;
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bool f = false;
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while(not lock.compare_exchange_strong(f,t)){}
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{
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gp_config::assertion((write_idx + 1)%processes.size() != read_idx, "bad push to circular buffer");
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processes[write_idx] = node;
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write_idx=(write_idx+1)%processes.size();
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}
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while(not lock.compare_exchange_strong(t,f)){}
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}
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gp::topic_list::node_ptr pop() {
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bool t = true;
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bool f = false;
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gp::topic_list::node_ptr ret;
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while(not lock.compare_exchange_strong(f,t)){}
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{
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if(read_idx == write_idx) {
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ret = nullptr;
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} else {
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ret = processes[read_idx];
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read_idx=(read_idx+1)%processes.size();
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}
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}
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while(not lock.compare_exchange_strong(t,f)){}
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return ret;
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}
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};
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locked_circular_buffer running;
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locked_circular_buffer waiting;
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locked_circular_buffer to_clean;
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locked_circular_buffer naughty;
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system* sys = nullptr;
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public:
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simple_scheduling()
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{}
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virtual void link(system& value) {
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gp_config::assertion(!(sys), "Double linkage detected");
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sys = &value;
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sys->process_managers.emplace_back(*sys,0);
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}
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virtual gp::topic_list::node_ptr one(size_t) {
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auto v = running.pop();
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do{
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if(v) return v;
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v = running.pop();
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}while(true);
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}
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virtual void push(gp::topic_list::node_ptr node) {
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running.push(node);
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}
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virtual gp::topic_list::node_ptr next(size_t, gp::topic_list::node_ptr current) {
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switch(current->value->state) {
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case process_status::inactive:
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case process_status::running:
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running.push(current);
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break;
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case process_status::finished:
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to_clean.push(current);
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break;
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case process_status::zombie:
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naughty.push(current);
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break;
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case process_status::waiting:
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waiting.push(current);
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break;
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}
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return one(0);
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}
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virtual gp::scheduler& current_scheduler() {
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return sys->process_managers[0];
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}
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};
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}
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