18 lines
449 B
C
18 lines
449 B
C
#include "pthread_impl.h"
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void __wait(volatile int *addr, volatile int *waiters, int val, int priv)
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{
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int spins=100;
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if (priv) priv = FUTEX_PRIVATE;
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while (spins-- && (!waiters || !*waiters)) {
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if (*addr==val) a_spin();
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else return;
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}
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if (waiters) a_inc(waiters);
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while (*addr==val) {
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__syscall(SYS_futex, addr, FUTEX_WAIT|priv, val, 0) != -ENOSYS
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|| __syscall(SYS_futex, addr, FUTEX_WAIT, val, 0);
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}
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if (waiters) a_dec(waiters);
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}
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