__lock_task_sighand

Name:__lock_task_sighand

Proto:struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, unsigned long *flags)

Type:struct sighand_struct

Parameter:

Type	Parameter	Name
struct task_struct *	tsk
unsigned long *	flags

1368

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

1369

1370

sighand = fetch RCU-protected pointer for dereferencing(sighand)

1371

If Value for the false possibility is greater at compile time(sighand == NULL) Then Break

1385

spin_lock_irqsave( & siglock, * flags)

1386

If Value is more likely to compile time(sighand == sighand) Then Break

1388

spin_unlock_irqrestore( & siglock, * flags)

1390

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

1392

Return sighand

**Caller**
Name	Describe
lock_task_sighand

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