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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [alpha/] [lib/] [dec_and_lock.c] - Rev 1275
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/* * arch/alpha/lib/dec_and_lock.c * * ll/sc version of atomic_dec_and_lock() * */ #include <linux/spinlock.h> #include <asm/atomic.h> asm (".text \n\ .global atomic_dec_and_lock \n\ .ent atomic_dec_and_lock \n\ .align 4 \n\ atomic_dec_and_lock: \n\ .prologue 0 \n\ 1: ldl_l $1, 0($16) \n\ subl $1, 1, $1 \n\ beq $1, 2f \n\ stl_c $1, 0($16) \n\ beq $1, 4f \n\ mb \n\ clr $0 \n\ ret \n\ 2: br $29, 3f \n\ 3: ldgp $29, 0($29) \n\ br $atomic_dec_and_lock_1..ng \n\ .subsection 2 \n\ 4: br 1b \n\ .previous \n\ .end atomic_dec_and_lock"); static int __attribute__((unused)) atomic_dec_and_lock_1(atomic_t *atomic, spinlock_t *lock) { /* Slow path */ spin_lock(lock); if (atomic_dec_and_test(atomic)) return 1; spin_unlock(lock); return 0; }
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