1#include "stdio_impl.h" 2#include "pthread_impl.h" 3 4#ifdef __GNUC__ 5__attribute__((__noinline__)) 6#endif 7static 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 16static 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