int ftrylockfile(FILE *f)
{
- libc.lockfile = __lockfile;
- if (f->owner && f->owner == pthread_self()->tid) {
- if (f->lockcount == INT_MAX)
+ int tid = pthread_self()->tid;
+ if (f->lock == tid) {
+ if (f->lockcount == LONG_MAX)
return -1;
f->lockcount++;
return 0;
}
- if (a_swap(&f->lock, 1))
+ if (f->lock < 0) f->lock = 0;
+ if (f->lock || a_cas(&f->lock, 0, tid))
return -1;
- f->owner = pthread_self()->tid;
f->lockcount = 1;
return 0;
}