christoph/lecture-operating-system-development
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This commit is contained in:
Christoph Urlacher
2022-07-24 16:51:16 +02:00
parent a15e1d9fd4
commit e1eac41853
18 changed files with 48 additions and 97 deletions
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20
c_os/kernel/threads/Scheduler.h
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@ -19,8 +19,6 @@
class Scheduler {
private:
Scheduler(const Scheduler& copy) = delete; // Verhindere Kopieren
NamedLogger log;
bse::vector<bse::unique_ptr<Thread>> ready_queue;
@ -35,8 +33,8 @@ private:
unsigned int idle_tid = 0U;
// Roughly the old dispatcher functionality
void start(bse::vector<bse::unique_ptr<Thread>>::iterator next); // Start next without prev
void switch_to(Thread* prev_raw, bse::vector<bse::unique_ptr<Thread>>::iterator next); // Switch from prev to next
/*[[noreturn]]*/ void start(bse::vector<bse::unique_ptr<Thread>>::iterator next); // Start next without prev
/*[[noreturn]]*/ void switch_to(Thread* prev_raw, bse::vector<bse::unique_ptr<Thread>>::iterator next); // Switch from prev to next
// Kann nur vom Idle-Thread aufgerufen werden (erster Thread der vom Scheduler gestartet wird)
void enable_preemption(unsigned int tid) { idle_tid = tid; }
@ -45,6 +43,8 @@ private:
void ready(bse::unique_ptr<Thread>&& thread);
public:
Scheduler(const Scheduler& copy) = delete; // Verhindere Kopieren
Scheduler() : log("SCHED"), ready_queue(true), block_queue(true) {} // lazy queues, wait for allocator
// The scheduler has to init the queues explicitly after the allocator is available
@ -63,7 +63,7 @@ public:
bool preemption_enabled() const { return idle_tid != 0U; }
// Scheduler starten
void schedule();
/*[[noreturn]]*/ void schedule();
// Helper that directly constructs the thread, then readys it
template<typename T, typename... Args>
@ -80,13 +80,13 @@ public:
// NOTE: When a thread exits itself it will disappear...
// Maybe put exited threads in an exited queue?
// Then they would have to be acquired from there to exit...
void exit();
/* [[noreturn]] */ void exit(); // Returns on error because we don't have exceptions
// Thread mit 'Gewalt' terminieren
void kill(unsigned int tid, bse::unique_ptr<Thread>* ptr);
void kill(unsigned int tid) { kill(tid, nullptr); }
// Ask thread to exit
// Asks thread to exit
// NOTE: I had many problems with killing threads that were stuck in some semaphore
// or were involved in any locking mechanisms, so with this a thread can make sure
// to "set things right" before exiting itself (but could also be ignored)
@ -94,13 +94,13 @@ public:
void nice_kill(unsigned int tid) { nice_kill(tid, nullptr); }
// CPU freiwillig abgeben und Auswahl des naechsten Threads
void yield();
/* [[noreturn]] */ void yield(); // Returns when only the idle thread runs
// Thread umschalten; wird aus der ISR des PITs gerufen
void preempt();
/* [[noreturn]] */ void preempt(); // Returns when only the idle thread runs
// Blocks current thread (move to block_queue)
void block();
/* [[noreturn]] */ void block(); // Returns on error because we don't have exceptions
// Deblock by tid (move to ready_queue)
void deblock(unsigned int tid);