!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 

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Viewing file:     dec_and_lock.c (961 B)      -rw-r--r--
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#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/atomic.h>

/*
 * This is an architecture-neutral, but slow,
 * implementation of the notion of "decrement
 * a reference count, and return locked if it
 * decremented to zero".
 *
 * NOTE NOTE NOTE! This is _not_ equivalent to
 *
 *    if (atomic_dec_and_test(&atomic)) {
 *        spin_lock(&lock);
 *        return 1;
 *    }
 *    return 0;
 *
 * because the spin-lock and the decrement must be
 * "atomic".
 *
 * This slow version gets the spinlock unconditionally,
 * and releases it if it isn't needed. Architectures
 * are encouraged to come up with better approaches,
 * this is trivially done efficiently using a load-locked
 * store-conditional approach, for example.
 */

#ifndef ATOMIC_DEC_AND_LOCK
int atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
{
    spin_lock(lock);
    if (atomic_dec_and_test(atomic))
        return 1;
    spin_unlock(lock);
    return 0;
}

EXPORT_SYMBOL(atomic_dec_and_lock);
#endif

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