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