diff options
Diffstat (limited to 'libpthread/linuxthreads/spinlock.c')
| -rw-r--r-- | libpthread/linuxthreads/spinlock.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/libpthread/linuxthreads/spinlock.c b/libpthread/linuxthreads/spinlock.c index 80aeda529..f0cf19c54 100644 --- a/libpthread/linuxthreads/spinlock.c +++ b/libpthread/linuxthreads/spinlock.c @@ -24,8 +24,6 @@ #include "spinlock.h" #include "restart.h" -libpthread_hidden_proto(nanosleep) - static void __pthread_acquire(int * spinlock); static __inline__ void __pthread_release(int * spinlock) @@ -65,6 +63,7 @@ void internal_function __pthread_lock(struct _pthread_fastlock * lock, #if defined HAS_COMPARE_AND_SWAP long oldstatus, newstatus; int successful_seizure, spurious_wakeup_count; + int spin_count; #endif #if defined TEST_FOR_COMPARE_AND_SWAP @@ -84,11 +83,11 @@ void internal_function __pthread_lock(struct _pthread_fastlock * lock, return; spurious_wakeup_count = 0; + spin_count = 0; /* On SMP, try spinning to get the lock. */ -#if 0 + if (__pthread_smp_kernel) { - int spin_count; int max_count = lock->__spinlock * 2 + 10; if (max_count > MAX_ADAPTIVE_SPIN_COUNT) @@ -112,7 +111,6 @@ void internal_function __pthread_lock(struct _pthread_fastlock * lock, lock->__spinlock += (spin_count - lock->__spinlock) / 8; } -#endif again: @@ -617,6 +615,8 @@ void __pthread_alt_unlock(struct _pthread_fastlock *lock) if (maxprio == INT_MIN) continue; + ASSERT (p_max_prio != (struct wait_node *) 1); + /* Now we want to to remove the max priority thread's wait node from the list. Before we can do this, we must atomically try to change the node's abandon state from zero to nonzero. If we succeed, that means we @@ -637,8 +637,20 @@ void __pthread_alt_unlock(struct _pthread_fastlock *lock) #if defined HAS_COMPARE_AND_SWAP wait_node_dequeue(pp_head, pp_max_prio, p_max_prio); #endif + + /* Release the spinlock *before* restarting. */ +#if defined TEST_FOR_COMPARE_AND_SWAP + if (!__pthread_has_cas) +#endif +#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP + { + __pthread_release(&lock->__spinlock); + } +#endif + restart(p_max_prio->thr); - break; + + return; } } |