diff options
Diffstat (limited to 'linuxthreads/sysdeps/sparc/sparc32/pspinlock.c')
| -rw-r--r-- | linuxthreads/sysdeps/sparc/sparc32/pspinlock.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/linuxthreads/sysdeps/sparc/sparc32/pspinlock.c b/linuxthreads/sysdeps/sparc/sparc32/pspinlock.c index ff72ff0c35..1788d7af33 100644 --- a/linuxthreads/sysdeps/sparc/sparc32/pspinlock.c +++ b/linuxthreads/sysdeps/sparc/sparc32/pspinlock.c @@ -21,10 +21,25 @@ #include <pthread.h> +/* This implementation is similar to the one used in the Linux kernel. */ int __pthread_spin_lock (pthread_spinlock_t *lock) { - XXX + asm volatile + ("1: ldstub [%0], %%g2\n" + " orcc %%g2, 0x0, %%g0\n" + " bne,a 2f\n" + " ldub [%0], %%g2\n" + ".subsection 2\n" + "2: orcc %%g2, 0x0, %%g0\n" + " bne,a 2b\n" + " ldub [%0], %%g2\n" + " b,a 1b\n" + ".previous" + : /* no outputs */ + : "r" (lock) + : "g2", "memory", "cc"); + return 0; } weak_alias (__pthread_spin_lock, pthread_spin_lock) @@ -32,7 +47,13 @@ weak_alias (__pthread_spin_lock, pthread_spin_lock) int __pthread_spin_trylock (pthread_spinlock_t *lock) { - XXX + int result; + asm volatile + ("ldstub [%1], %0" + : "=r" (result) + : "r" (lock) + : "memory"); + return result == 0 ? 0 : EBUSY; } weak_alias (__pthread_spin_trylock, pthread_spin_trylock) @@ -40,7 +61,8 @@ weak_alias (__pthread_spin_trylock, pthread_spin_trylock) int __pthread_spin_unlock (pthread_spinlock_t *lock) { - XXX + *lock = 0; + return 0; } weak_alias (__pthread_spin_unlock, pthread_spin_unlock) @@ -51,7 +73,7 @@ __pthread_spin_init (pthread_spinlock_t *lock, int pshared) /* 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. */ - XXX + *lock = 0; return 0; } weak_alias (__pthread_spin_init, pthread_spin_init) |