smplock.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:1k
- /*
- * <asm/smplock.h>
- *
- * Default SMP lock implementation
- */
- #ifndef _ASM_SMPLOCK_H
- #define _ASM_SMPLOCK_H
- #include <linux/sched.h>
- #include <linux/interrupt.h>
- #include <linux/spinlock.h>
- extern spinlock_t kernel_flag;
- #define kernel_locked() spin_is_locked(&kernel_flag)
- /*
- * Release global kernel lock and global interrupt lock
- */
- static __inline__ void release_kernel_lock(struct task_struct *task, int cpu)
- {
- if (task->lock_depth >= 0)
- spin_unlock(&kernel_flag);
- release_irqlock(cpu);
- __sti();
- }
- /*
- * Re-acquire the kernel lock
- */
- static __inline__ void reacquire_kernel_lock(struct task_struct *task)
- {
- if (task->lock_depth >= 0)
- spin_lock(&kernel_flag);
- }
- /*
- * Getting the big kernel lock.
- *
- * This cannot happen asynchronously,
- * so we only need to worry about other
- * CPU's.
- */
- static __inline__ void lock_kernel(void)
- {
- if (!++current->lock_depth)
- spin_lock(&kernel_flag);
- }
- static __inline__ void unlock_kernel(void)
- {
- if (--current->lock_depth < 0)
- spin_unlock(&kernel_flag);
- }
- #endif /* _ASM_SMPLOCK_H */