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#ifndef _ATOMIC_H_
#define _ATOMIC_H_
#include <stdlib.h>
#include <pthread.h>
#include <util.h>
typedef int refcnt;
static inline void refcnt_inc(refcnt *cnt)
{
__sync_add_and_fetch(cnt, 1);
}
static inline refcnt refcnt_dec(refcnt *cnt)
{
return __sync_sub_and_fetch(cnt, 1);
}
typedef pthread_mutex_t lock;
static inline void lock_init(lock *l)
{
pthread_mutex_init(l, NULL);
}
static inline void lock_acquire(lock *l)
{
int ret = pthread_mutex_lock(l);
if (ret < 0) {
switch (ret) {
case EINVAL:
pr_err("invalid mutex\n");
exit(1);
case EDEADLK:
pr_err("a deadlock would occur\n");
exit(1);
}
}
}
static inline void lock_release(lock *l)
{
int ret = pthread_mutex_unlock(l);
if (ret < 0) {
switch (ret) {
case EINVAL:
pr_err("invalid mutex\n");
exit(1);
case EPERM:
pr_err("this thread does not hold this mutex\n");
exit(1);
}
}
}
#endif /* _ATOMIC_H_ */
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