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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 26 of file pspinlock.c.

{
  unsigned int val;

  do
    asm volatile ("tas %1; sne %0"
                : "=dm" (val), "=m" (*lock)
                : "m" (*lock)
                : "cc");
  while (val);

  return 0;
}

Definition at line 39 of file pspinlock.c.

{
  unsigned int val;

  asm volatile ("tas %1; sne %0"
              : "=dm" (val), "=m" (*lock)
              : "m" (*lock)
              : "cc");

  return val ? EBUSY : 0;
}

Definition at line 54 of file pspinlock.c.

{
  return *lock = 0;
}

Definition at line 62 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 73 of file pspinlock.c.

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