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Somewhat working psynch_mutex
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src/lkm/psynch/psynch_mutex.c
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src/lkm/psynch/psynch_mutex.c
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#include "psynch_mutex.h"
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#include "../darling_task.h"
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#include "../debug.h"
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/list.h>
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if (copy_from_user(&args, in_args, sizeof(args)))
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return -EFAULT;
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debug_msg("psynch_mutexwait_trap(%d): mutex=0x%llx, mgen=0x%x\n",
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current->pid, args.mutex, args.mgen);
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spin_lock(&task->mutex_wq_lock);
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mutex = mutex_get(task, args.mutex);
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if (mutex->mgen == 0)
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if (mutex->mgen != 0)
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{
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spin_unlock(&task->mutex_wq_lock);
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retval = 0;
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// Put the mutex twice, because the waker did not put the mutex
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// in order to keep the information around
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mutex_put(task, mutex);
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mutex_put(task, mutex);
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retval = mutex->mgen;
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goto out;
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}
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···
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list_del(&waiter.entry);
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if (waiter.wakeup)
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{
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retval = mutex->mgen;
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mutex->mgen = 0;
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}
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debug_msg("(%d)--> retval: 0x%x\n", current->pid, retval);
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mutex_put(task, mutex);
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spin_unlock(&task->mutex_wq_lock);
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if (copy_from_user(&args, in_args, sizeof(args)))
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return -EFAULT;
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debug_msg("psynch_mutexdrop_trap(%d): mutex=0x%llx, mgen=0x%x\n",
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current->pid, args.mutex, args.mgen);
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spin_lock(&task->mutex_wq_lock);
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mutex = mutex_get(task, args.mutex);
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waiter->wakeup = 1;
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wake_up_interruptible(&mutex->wq);
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mutex_put(task, mutex);
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}
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mutex_put(task, mutex);
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spin_unlock(&task->mutex_wq_lock);
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return 0;