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- #include <errno.h>
- #include <pthread.h>
- #include "internals.h"
- int
- __pthread_spin_lock (pthread_spinlock_t *lock)
- {
- __asm__ __volatile__
- ("\n"
- "1:\n\t"
- "lock; decl %0\n\t"
- "js 2f\n\t"
- ".section .text.spinlock,\"ax\"\n"
- "2:\n\t"
- "cmpl $0,%0\n\t"
- "rep; nop\n\t"
- "jle 2b\n\t"
- "jmp 1b\n\t"
- ".previous"
- : "=m" (*lock));
- return 0;
- }
- weak_alias (__pthread_spin_lock, pthread_spin_lock)
- int
- __pthread_spin_trylock (pthread_spinlock_t *lock)
- {
- int oldval;
- __asm__ __volatile__
- ("xchgl %0,%1"
- : "=r" (oldval), "=m" (*lock)
- : "0" (0));
- return oldval > 0 ? 0 : EBUSY;
- }
- weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
- int
- __pthread_spin_unlock (pthread_spinlock_t *lock)
- {
- __asm__ __volatile__
- ("movl $1,%0"
- : "=m" (*lock));
- return 0;
- }
- weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
- int
- __pthread_spin_init (pthread_spinlock_t *lock, int pshared)
- {
-
- *lock = 1;
- return 0;
- }
- weak_alias (__pthread_spin_init, pthread_spin_init)
- int
- __pthread_spin_destroy (pthread_spinlock_t *lock)
- {
-
- return 0;
- }
- weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
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