On 30 mei 2006, at 08:57, Marco van de Voort wrote:
This is not that easy: Is it only for UP or maybe also for SMP
machines?
Basically, for x86 the "cli" and "sti" asm instructions do disable/
enable interrupts, but read about it before you try.
Currently, I do such stuff only inside a driver (Linux kernel:
spin_lock, or win98 vxd: cli/sti) and don't know about any user space
function for this.
FreeBSD has (in pthread.h):
int pthread_spin_init(pthread_spinlock_t *, int);
int pthread_spin_destroy(pthread_spinlock_t *);
int pthread_spin_lock(pthread_spinlock_t *);
int pthread_spin_trylock(pthread_spinlock_t *);
int pthread_spin_unlock(pthread_spinlock_t *);
Those (fortunately) do not disable interrupts. I can't imagine that
any (generic) pre-emptively multitasked OS would allow a user space
program to disable interrupts.
Jonas
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