diff options
Diffstat (limited to 'linuxthreads/sysdeps/mips')
| -rw-r--r-- | linuxthreads/sysdeps/mips/pspinlock.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/linuxthreads/sysdeps/mips/pspinlock.c b/linuxthreads/sysdeps/mips/pspinlock.c index d6cda216ff..906fb4ae60 100644 --- a/linuxthreads/sysdeps/mips/pspinlock.c +++ b/linuxthreads/sysdeps/mips/pspinlock.c @@ -21,10 +21,28 @@ #include <pthread.h> +/* This implementation is similar to the one used in the Linux kernel. */ int __pthread_spin_lock (pthread_spinlock_t *lock) { - XXX + unsigned int tmp; + + asm volatile + (".set\tnoreorder\t\t\t# spin_lock\n" + ".set\tpush\n" + ".set\tmips2\n" + "1:\tll\t%1, %2\n\t" + "bnez\t%1, 1b\n\t" + " li\t%1, 1\n\t" + "sc\t%1, %0\n\t" + "beqz\t%1, 1b\n\t" + ".set\tpop\n" + ".set\treorder" + : "=o" (*lock), "=&r" (tmp) + : "o" (*lock) + : "memory"); + + return 0; } weak_alias (__pthread_spin_lock, pthread_spin_lock) @@ -32,7 +50,8 @@ weak_alias (__pthread_spin_lock, pthread_spin_lock) int __pthread_spin_trylock (pthread_spinlock_t *lock) { - XXX + /* To be done. */ + return 0; } weak_alias (__pthread_spin_trylock, pthread_spin_trylock) @@ -40,7 +59,14 @@ weak_alias (__pthread_spin_trylock, pthread_spin_trylock) int __pthread_spin_unlock (pthread_spinlock_t *lock) { - XXX + asm volatile + (".set\tnoreorder\t\t\t# spin_unlock\n\t" + "sw\t$0, %0\n\t" + ".set\treorder" + : "=o" (*lock) + : "o" (*lock) + : "memory"); + return 0; } weak_alias (__pthread_spin_unlock, pthread_spin_unlock) @@ -51,7 +77,7 @@ __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 = 1; return 0; } weak_alias (__pthread_spin_init, pthread_spin_init) |