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InterruptUnlock()

Release a critical section in an interrupt handler

Synopsis:

#include <sys/neutrino.h>

void InterruptUnlock( intrspin_t* spinlock );

Arguments:

spinlock: The spinlock (a variable shared between the interrupt handler and a thread) used in a call to InterruptLock() to lock the handler.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The InterruptUnlock() function releases a critical section by unlocking the specified spinlock, reenabling interrupts. You can call this function from a thread or from an interrupt handler.

Before calling this function, the thread must:

have the PROCMGR_AID_IO ability enabled. For more information, see procmgr_ability().
request I/O privileges by calling:
```
ThreadCtl( _NTO_TCTL_IO, 0 );
```

If the thread doesn't do these things, it might SIGSEGV when it calls InterruptUnlock().

Classification:

Safety:
Cancellation point	No
Interrupt handler	Yes
Signal handler	Yes
Thread	Yes

Related links

InterruptDisable()
Disable hardware interrupts
InterruptEnable()
Enable hardware interrupts
InterruptLock()
Guard a critical section in an interrupt handler
InterruptMask()
Disable a hardware interrupt
InterruptUnmask()
Enable a hardware interrupt
ThreadCtl(), ThreadCtl_r()
Control a thread

I

Last modified: 2013-09-30

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