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#include "stdio_impl.h"
#include "pthread_impl.h"
void __lockfile(FILE *f)
{
int spins=100000;
int tid;
if (f->lock < 0) return;
tid = __pthread_self()->tid;
if (f->lock == tid) {
while (f->lockcount == INT_MAX);
f->lockcount++;
return;
}
while (a_cas(&f->lock, 0, tid))
if (spins) spins--, a_spin();
else syscall(SYS_sched_yield);
f->lockcount = 1;
}
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