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https://github.com/fluencelabs/musl
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77f15d108e
these should be tweaked according to testing. offhand i know 1000 is too low and 5000 is likely to be sufficiently high. consider trying to add futexes to file locking, too...
16 lines
360 B
C
16 lines
360 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=10000;
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if (priv) priv = 128; priv=0;
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while (spins--) {
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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, (long)addr, FUTEX_WAIT|priv, val, 0);
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if (waiters) a_dec(waiters);
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}
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