arch/x86_64/lock.c


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#include "lock.h"

extern int _kernel_panic_unlock;

void
take_mutex(atomic_flag *lock)
{
    if(_kernel_panic_unlock) return;
    while(atomic_flag_test_and_set(lock)) {
        __builtin_ia32_pause();
    }
}

int
try_take_mutex(atomic_flag *lock)
{
    if(_kernel_panic_unlock) return 1;
    return atomic_flag_test_and_set(lock);
}

void
release_mutex(atomic_flag *lock)
{
    atomic_flag_clear(lock);
}