InterruptEnable()
Enable hardware interrupts
Synopsis:
#include <sys/neutrino.h>
void InterruptEnable( void );
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The InterruptEnable() function enables all hardware interrupts. You can call it from a thread or from an interrupt handler. Before calling this function:
- The process must have the PROCMGR_AID_IO ability enabled. For more information, see procmgr_ability().
- The calling thread must have obtained I/O privileges by calling:
ThreadCtl( _NTO_TCTL_IO_LEVEL, (void*)_NTO_IO_LEVEL_1 );
If you don't do these things, the thread might SIGSEGV when it calls InterruptEnable().
You should call this function as quickly as possible after calling InterruptDisable().
Use InterruptLock() and InterruptUnlock() instead of InterruptDisable() and InterruptEnable(). The InterruptLock() and InterruptUnlock() functions perform the intended function on SMP hardware, and allow your interrupt thread to run on any processor in the system.
The InterruptEnable() function doesn't support nesting. If a specific thread calls this function once and then calls it again without having disabled hardware interrupts, the second call has no effect.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | Yes |
| Signal handler | Yes |
| Thread | Yes |