core/include/thread.h


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#ifndef _THREAD_H
#define _THREAD_H

#include <stddef.h>
#include <inttypes.h>
#include "core.h"

struct semaphore;

struct thread_state {
    uint32_t ebx, esp, ebp, esi, edi;
};

struct thread_list {
    struct thread_list *next, *prev;
};

struct thread_block {
    struct thread_list list;
    struct thread *thread;
    struct semaphore *semaphore;
    mstime_t block_time;
    mstime_t timeout;
    bool timed_out;
};

struct thread {
    struct thread_state state;
    struct thread_list  list;
    struct thread_block *blocked;
    int prio;
};

void __schedule(void);
void __switch_to(struct thread *);
void thread_yield(void);

extern struct thread *__current;
static inline struct thread *current(void)
{
    return __current;
}

struct semaphore {
    int count;
    struct thread_list list;
};

mstime_t sem_down(struct semaphore *, mstime_t);
void sem_up(struct semaphore *);
void sem_init(struct semaphore *, int);

typedef unsigned long irq_state_t;

static inline irq_state_t irq_state(void)
{
    irq_state_t __st;

    asm volatile("pushfl ; popl %0" : "=rm" (__st));
    return __st;
}

static inline irq_state_t irq_save(void)
{
    irq_state_t __st;

    asm volatile("pushfl ; popl %0 ; cli" : "=rm" (__st));
    return __st;
}

static inline void irq_restore(irq_state_t __st)
{
    asm volatile("pushl %0 ; popfl" : : "rm" (__st));
}

void start_thread(struct thread *t, void *stack, size_t stack_size, int prio,
		  void (*start_func)(void *), void *func_arg);
void __exit_thread(void);
void kill_thread(struct thread *);

void start_idle_thread(void);
void test_thread(void);

#endif /* _THREAD_H */