#include "stdio_impl.h" | |
#include "pthread_impl.h" | |
#ifdef __GNUC__ | |
__attribute__((__noinline__)) | |
#endif | |
static int locking_getc(FILE *f, int tid) | |
{ | |
if (a_cas(&f->lock, 0, tid)) __lockfile(f); | |
int c = getc_unlocked(f); | |
if (a_swap(&f->lock, 0) & MAYBE_WAITERS) | |
__wake(&f->lock, 1, 1); | |
return c; | |
} | |
static inline int do_getc(FILE *f) | |
{ | |
int tid, l = f->lock; | |
if (l < 0 || (l & ~MAYBE_WAITERS) == (tid=__pthread_self()->tid)) | |
return getc_unlocked(f); | |
return locking_getc(f, tid); | |
} |