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glibc  2.9
Functions
pspinlock.c File Reference
#include <errno.h>
#include <pthread.h>
#include "internals.h"

Go to the source code of this file.

Functions

int __pthread_spin_lock (pthread_spinlock_t *lock)
 weak_alias (__pthread_spin_lock, pthread_spin_lock)
 weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
 weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
 weak_alias (__pthread_spin_init, pthread_spin_init)

Function Documentation

int __pthread_spin_lock ( pthread_spinlock_t *  lock)

Definition at line 25 of file pspinlock.c.

{
  unsigned int val;

  do
    asm volatile ("tas.b @%1; movt %0"
                : "=r" (val)
                : "r" (lock)
                : "memory");
  while (val == 0);

  return 0;
}

Definition at line 38 of file pspinlock.c.

{
  unsigned int val;

  asm volatile ("tas.b @%1; movt %0"
              : "=r" (val)
              : "r" (lock)
              : "memory");
  return val ? 0 : EBUSY;
}

Definition at line 52 of file pspinlock.c.

{
  return *lock = 0;
}

Definition at line 60 of file pspinlock.c.

{
  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
     all processes which can access the memory location `lock' points
     to can use the spinlock.  */
  return *lock = 0;
}

Definition at line 71 of file pspinlock.c.

{
  /* Nothing to do.  */
  return 0;
}