!C99Shell v. 1.0 pre-release build #13!

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uname -a: Linux snow.he.net 4.4.276-v2-mono-1 #1 SMP Wed Jul 21 11:21:17 PDT 2021 i686 

uid=99(nobody) gid=98(nobody) groups=98(nobody) 

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Viewing file:     dec_and_lock.c (778 B)      -rw-r--r--
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/*
 * x86 version of "atomic_dec_and_lock()" using
 * the atomic "cmpxchg" instruction.
 *
 * (For CPU's lacking cmpxchg, we use the slow
 * generic version, and this one never even gets
 * compiled).
 */

#include <linux/spinlock.h>
#include <asm/atomic.h>

int atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
{
    int counter;
    int newcount;

repeat:
    counter = atomic_read(atomic);
    newcount = counter-1;

    if (!newcount)
        goto slow_path;

    asm volatile("lock; cmpxchgl %1,%2"
        :"=a" (newcount)
        :"r" (newcount), "m" (atomic->counter), "0" (counter));

    /* If the above failed, "eax" will have changed */
    if (newcount != counter)
        goto repeat;
    return 0;

slow_path:
    spin_lock(lock);
    if (atomic_dec_and_test(atomic))
        return 1;
    spin_unlock(lock);
    return 0;
}

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