אתה משתמש בדפדפן מיושן. יתכן והאתר הנוכחי יוצג באופן שגוי, כמו כן אתרים אחרים ברשת.
אנא שדרג את הדפדפן או השתמש בדפדפן חילופי.
אנא שדרג את הדפדפן או השתמש בדפדפן חילופי.
דגעדגע
- פותח הנושא N i X
- פורסם בתאריך
SQL
select *
from movement_snapshot
where snapshot_time = '2008-05-01 00:00:00'
and item_id in ((select item_id
from movement_snapshot
where snapshot_time = '2008-05-01 00:00:00'
)
except
(select item_id
from item_transaction
where move_at > '2008-05-01 00:00:00'
and move_at <= '2008-06-01 00:00:00'
)
)
python 'bla' bla ruby 'bla' cc '-r' del cat deltree
select *
from movement_snapshot
where snapshot_time = '2008-05-01 00:00:00'
and item_id in ((select item_id
from movement_snapshot
where snapshot_time = '2008-05-01 00:00:00'
)
except
(select item_id
from item_transaction
where move_at > '2008-05-01 00:00:00'
and move_at <= '2008-06-01 00:00:00'
)
)
python 'bla' bla ruby 'bla' cc '-r' del cat deltree
דגעדגע
Semaphore mutex = new Semaphore(1);
int readers = 0; //Initial number of threads inside the critical section
public int getRadius(){
mutex.acqire(); //Approaching common resources
readers++;
mutex.release();
//Now other readers may read the radius
//**************************************************
int tempRadius = radius;
//**************************************************
mutex.acquire(); //Adain, approaching common resources
readers--;
mutex.release();
return tempRadius;
}
public void setRadius(int newRadius){
mutex.acqire(); //Approaching common resources
while(readers > 0){
mutex.release();
//Let someone else acquire the mutex and set count
mutex.acquire();
}
radius = newRadius;
mutex.release;
}
Semaphore mutex = new Semaphore(1);
int readers = 0; //Initial number of threads inside the critical section
public int getRadius(){
mutex.acqire(); //Approaching common resources
readers++;
mutex.release();
//Now other readers may read the radius
//**************************************************
int tempRadius = radius;
//**************************************************
mutex.acquire(); //Adain, approaching common resources
readers--;
mutex.release();
return tempRadius;
}
public void setRadius(int newRadius){
mutex.acqire(); //Approaching common resources
while(readers > 0){
mutex.release();
//Let someone else acquire the mutex and set count
mutex.acquire();
}
radius = newRadius;
mutex.release;
}
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