blob: 2cc63d2dbe3d3e0e80530097b1913d2605a512f0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
#include "stdio_impl.h"
#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
#include "pthread_impl.h"
#ifdef __GNUC__
__attribute__((__noinline__))
#endif
static int locking_putc(int c, FILE *f)
{
if (a_cas(&f->lock, 0, MAYBE_WAITERS-1)) __lockfile(f);
c = putc_unlocked(c, f);
if (a_swap(&f->lock, 0) & MAYBE_WAITERS)
__wake(&f->lock, 1, 1);
return c;
}
#endif
static inline int do_putc(int c, FILE *f)
{
#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
int l = f->lock;
if (l < 0 || l && (l & ~MAYBE_WAITERS) == __pthread_self()->tid)
return putc_unlocked(c, f);
return locking_putc(c, f);
#else
// With no threads, locking is unnecessary.
return putc_unlocked(c, f);
#endif
}
|
