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#include "stdio_impl.h"
#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
#include "pthread_impl.h"
#ifdef __GNUC__
__attribute__((__noinline__))
#endif
static int locking_getc(FILE *f)
{
if (a_cas(&f->lock, 0, MAYBE_WAITERS-1)) __lockfile(f);
int c = getc_unlocked(f);
if (a_swap(&f->lock, 0) & MAYBE_WAITERS)
__wake(&f->lock, 1, 1);
return c;
}
#endif
static inline int do_getc(FILE *f)
{
#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
int l = f->lock;
if (l < 0 || l && (l & ~MAYBE_WAITERS) == __pthread_self()->tid)
return getc_unlocked(f);
return locking_getc(f);
#else
// With no threads, locking is unnecessary.
return getc_unlocked(f);
#endif
}
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