wait.h

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#pragma once
 
#include "sys/list_head.h"
#include "klib/spinlock.h"
 
#define WNOHANG 0x00000001
#define WUNTRACED 0x00000002
#define WIFSIGNALED(status) (!WIFSTOPPED(status) && !WIFEXITED(status))
#define WIFSTOPPED(status) (((status)&0xff) == 0x7f)
#define WEXITSTATUS(status) (((status)&0xff00) >> 8)
#define WTERMSIG(status) ((status)&0x7f)
#define WIFEXITED(status) (WTERMSIG(status) == 0)
#define WSTOPSIG(status) (WEXITSTATUS(status))
 
//==== Task States ============================================================
#define TASK_RUNNING         0x00     
#define TASK_INTERRUPTIBLE   (1 << 0) 
#define TASK_UNINTERRUPTIBLE (1 << 1) 
#define TASK_STOPPED         (1 << 2) 
#define TASK_TRACED          (1 << 3) 
#define EXIT_ZOMBIE          (1 << 4) 
#define EXIT_DEAD            (1 << 5) 
//==============================================================================
 
 
#define WQ_FLAG_EXCLUSIVE 0x01
//#define WQ_FLAG_WOKEN     0x02
//#define WQ_FLAG_BOOKMARK  0x04
//#define WQ_FLAG_CUSTOM    0x08
//#define WQ_FLAG_DONE      0x10
 
 
typedef struct wait_queue_head_t {
    spinlock_t lock;
    struct list_head task_list;
} wait_queue_head_t;
 
typedef struct wait_queue_entry_t {
    unsigned int flags;
    struct task_struct *task;
    int (*func)(struct wait_queue_entry_t *wait, unsigned mode, int sync);
    struct list_head task_list;
} wait_queue_entry_t;
 
 
wait_queue_entry_t * wait_queue_entry_alloc(void);
 
void wait_queue_entry_dealloc(wait_queue_entry_t * wait_queue_entry);
 
void init_waitqueue_entry(wait_queue_entry_t *wq, struct task_struct *task);
 
void add_wait_queue(wait_queue_head_t *head, wait_queue_entry_t *wq);
 
void remove_wait_queue(wait_queue_head_t *head, wait_queue_entry_t *wq);
 
int default_wake_function(wait_queue_entry_t *wait, unsigned mode, int sync);
 
wait_queue_entry_t *sleep_on(wait_queue_head_t *wq);