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#include "stdio_impl.h"
#include "pthread_impl.h"
#include <limits.h>
int ftrylockfile(FILE *f)
{
int tid = __pthread_self()->tid;
if (f->lock == tid) {
if (f->lockcount == LONG_MAX)
return -1;
f->lockcount++;
return 0;
}
if (f->lock < 0) f->lock = 0;
if (f->lock || a_cas(&f->lock, 0, tid))
return -1;
f->lockcount = 1;
return 0;
}
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