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#include "stdio_impl.h" #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; } static inline int do_getc(FILE *f) { int l = f->lock; if (l < 0 || l && (l & ~MAYBE_WAITERS) == __pthread_self()->tid) return getc_unlocked(f); return locking_getc(f); } |