Linux内核中的同步和互斥分析报告 （4）

#define local_irq_save(x) __asm__ __volatile__("pushfl ; popl %0 ; 
cli":
"=g" (x): /* no input */ :"memory")
#define local_irq_restore(x) __asm__ __volatile__("pushl %0 ; popfl": /* 
no 
output */ :"g" (x):"memory")
#define local_irq_disable() __asm__ __volatile__("cli": : :"memory")
#define local_irq_enable() __asm__ __volatile__("sti": : :"memory")
#define cpu_bh_disable(cpu) do { local_bh_count(cpu)++; barrier(); } while (0)
#define cpu_bh_enable(cpu) do { barrier(); local_bh_count(cpu)--; } while (0)
#define local_bh_disable() cpu_bh_disable(smp_processor_id())
#define local_bh_enable() cpu_bh_enable(smp_processor_id())

#define spin_lock_irqsave(lock, flags) do { 
local_irq_save(flags); sp
in_lock(lock); } while (0)
#define spin_lock_irq(lock) do { local_irq_disable(); 
spin_lock(lo
ck); } while (0)
#define spin_lock_bh(lock) do { local_bh_disable(); 
spin_lock(loc
k); } while (0)
#define spin_unlock_irqrestore(lock, flags) do { spin_unlock(lock); local_i
rq_restore(flags); } while (0)
#define spin_unlock_irq(lock) do { spin_unlock(lock); 
local_irq_enable();
} while (0)
#define spin_unlock_bh(lock) do { spin_unlock(lock); 
local_bh_enable(); 
} while (0)

read_lock_irqsave(lock, flags) , read_lock_irq(lock), 
read_lock_bh(lock) 和
write_lock_irqsave(lock, flags) , write_lock_irq(lock), 
write_lock_bh(lock
)