_enable -- Enable Interrupts

Format

#include <builtin.h>  /* also defined in <stdlib.h> */
void _enable( void );

Language Level: Extension
_enable enables interrupts by generating the STI machine instruction. Interrupts are enabled after the instruction following STI has been executed. If interrupts are disabled and you call _enable followed immediately by a call to _disable, interrupts remain disabled.

Because it is a built-in function and has no backing code in the library:

You can run code containing this function only at ring zero. Otherwise, an invalid instruction exception will be generated.

Return Value
There is no return value.

Example
In this example, _enable enables interrupts by executing an STI instruction.

#include <builtin.h>
int main(void)
{
   /* ------------------------------------------------------ */
   /* The expected assembler instruction looks like this :   */
   /*       STI                                              */
   /* ------------------------------------------------------ */
   _enable();
   return 0;
}



_disable -- Disable Interrupt
_interrupt -- Call Interrupt Procedure
<builtin.h>