diff options
Diffstat (limited to 'linuxthreads/sysdeps/sparc/sparc64/pspinlock.c')
| -rw-r--r-- | linuxthreads/sysdeps/sparc/sparc64/pspinlock.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/linuxthreads/sysdeps/sparc/sparc64/pspinlock.c b/linuxthreads/sysdeps/sparc/sparc64/pspinlock.c index 83edb08bba..e793b5c65c 100644 --- a/linuxthreads/sysdeps/sparc/sparc64/pspinlock.c +++ b/linuxthreads/sysdeps/sparc/sparc64/pspinlock.c @@ -21,10 +21,24 @@ #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], %%g5\n" + " brnz,pn %%g5, 2f\n" + " membar #StoreLoad | #StoreStore\n" + ".subsection 2\n" + "2: ldub [%0], %%g5\n" + " brnz,pt 2b\n" + " membar #LoadLoad\n" + " b,a,pt %%xcc, 1b\n" + ".previous" + : /* no outputs */ + : "r" (lock) + : "g5", "memory"); + return 0; } weak_alias (__pthread_spin_lock, pthread_spin_lock) @@ -32,7 +46,14 @@ weak_alias (__pthread_spin_lock, pthread_spin_lock) int __pthread_spin_trylock (pthread_spinlock_t *lock) { - XXX + int result; + asm volatile + ("ldstub [%1], %0\n" + "membar #StoreLoad | #StoreStore" + : "=r" (result) + : "r" (lock) + : "memory"); + return result == 0 ? 0 : EBUSY; } weak_alias (__pthread_spin_trylock, pthread_spin_trylock) @@ -40,7 +61,13 @@ weak_alias (__pthread_spin_trylock, pthread_spin_trylock) int __pthread_spin_unlock (pthread_spinlock_t *lock) { - XXX + asm volatile + ("membar #StoreStore | #LoadStore\n" + "stb %%g0, [%0]" + : + : "r" (lock) + : "memory"); + return 0; } weak_alias (__pthread_spin_unlock, pthread_spin_unlock) @@ -51,7 +78,7 @@ __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) |