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#ifdef ATOMIC_ALL_NIGHTERS
/* function annotations */
#define MAY_SLEEP __attribute__((atomic_all_nighters("might_sleep")))
#define WONT_SLEEP __attribute__((atomic_all_nighters("wont_sleep")))
/* context-changing annotations */
#define ENTER_ATOMIC __attribute__((atomic_all_nighters("wont_sleep","force_enable")))
#define EXIT_ATOMIC __attribute__((atomic_all_nighters("wont_sleep","force_disable")))
#define ENTER_ATOMIC_NESTED __attribute__((atomic_all_nighters("wont_sleep","enter_nested")))
#define EXIT_ATOMIC_NESTED __attribute__((atomic_all_nighters("wont_sleep","exit_nested")))
#else
#define MAY_SLEEP
#define WONT_SLEEP
#define ENTER_ATOMIC
#define EXIT_ATOMIC
#define ENTER_ATOMIC_NESTED
#define EXIT_ATOMIC_NESTED
#endif
struct mutex;
struct spinlock;
void MAY_SLEEP mutex_lock(struct mutex *mp);
void MAY_SLEEP mutex_unlock(struct mutex *mp);
void WONT_SLEEP mutex_assert_is_locked(struct mutex *mp);
void ENTER_ATOMIC_NESTED spin_lock(struct spinlock *sp);
void EXIT_ATOMIC_NESTED spin_unlock(struct spinlock *sp);
struct spinlock *a;
struct mutex *m;
void WONT_SLEEP g(void (*x)(struct mutex *) WONT_SLEEP)
{
spin_lock(a);
x(m);
spin_unlock(a);
}
int MAY_SLEEP main()
{
// This should fail.
// Argument types must contravary, not covary.
void (*f)(void (*)(struct mutex *) MAY_SLEEP) WONT_SLEEP = g;
f(mutex_lock);
// return 0;
}
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