1#include "stdio_impl.h"
2#include "pthread_impl.h"
3#include <limits.h>
4
5void __do_orphaned_stdio_locks()
6{
7 FILE *f;
8 for (f=__pthread_self()->stdio_locks; f; f=f->next_locked)
9 a_store(&f->lock, 0x40000000);
10}
11
12void __unlist_locked_file(FILE *f)
13{
14 if (f->lockcount) {
15 if (f->next_locked) f->next_locked->prev_locked = f->prev_locked;
16 if (f->prev_locked) f->prev_locked->next_locked = f->next_locked;
17 else __pthread_self()->stdio_locks = f->next_locked;
18 }
19}
20
21void __register_locked_file(FILE *f, pthread_t self)
22{
23 f->lockcount = 1;
24 f->prev_locked = 0;
25 f->next_locked = self->stdio_locks;
26 if (f->next_locked) f->next_locked->prev_locked = f;
27 self->stdio_locks = f;
28}
29
30int ftrylockfile(FILE *f)
31{
32 pthread_t self = __pthread_self();
33 int tid = self->tid;
34 int owner = f->lock;
35 if ((owner & ~MAYBE_WAITERS) == tid) {
36 if (f->lockcount == LONG_MAX)
37 return -1;
38 f->lockcount++;
39 return 0;
40 }
41 if (owner < 0) f->lock = owner = 0;
42 if (owner || a_cas(&f->lock, 0, tid))
43 return -1;
44 __register_locked_file(f, self);
45 return 0;
46}