1 #include "stdio_impl.h"
2 #include "pthread_impl.h"
3
4 #ifdef __GNUC__
5 __attribute__((__noinline__))
6 #endif
locking_putc(int c,FILE * f)7 static int locking_putc(int c, FILE *f)
8 {
9 if (a_cas(&f->lock, 0, MAYBE_WAITERS-1)) __lockfile(f);
10 c = putc_unlocked(c, f);
11 if (a_swap(&f->lock, 0) & MAYBE_WAITERS)
12 __wake(&f->lock, 1, 1);
13 return c;
14 }
15
do_putc(int c,FILE * f)16 static inline int do_putc(int c, FILE *f)
17 {
18 int l = f->lock;
19 if (l < 0 || l && (l & ~MAYBE_WAITERS) == __pthread_self()->tid)
20 return putc_unlocked(c, f);
21 return locking_putc(c, f);
22 }
23