Catomic-set{atomic_set(v,1);}P1(atomic_t*v){atomic_add_unless(v,1,0);}P2(atomic_t*v){atomic_set(v,0);}exists(v=2) 在这个案例中,我们希望 CPU1 中的 atomic_set() 发生在 atomic_add_excel() 之前,在这种情况下,后者将不执行操作,在这种情况下,我们将覆盖它的结果。在任何情况下,“2...
*/ atomic_t mm_count; // 内存描述符的引用计数 #ifdef CONFIG_MMU atomic_long_t pgtables_bytes; /* PTE page table pages */ #endif int map_count; /* number of VMAs */ spinlock_t page_table_lock; /* Protects page tables and some * counters */ /* * With some kernel config, the...
// include/linux/sched.h #define INIT_MM(name) \ { \ mm_rb: RB_ROOT, \ pgd: swapper_pg_dir, \ mm_users: ATOMIC_INIT(2), \ mm_count: ATOMIC_INIT(1), \ mmap_sem: __RWSEM_INITIALIZER(name.mmap_sem), \ page_table_lock: SPIN_LOCK_UNLOCKED, \ mmlist: LIST_HEAD_INIT(name....
unsigned long max_freeable; unsigned long node_allocs; unsigned long node_frees; unsigned long node_overflow; atomic_t allochit; atomic_t allocmiss; atomic_t freehit; atomic_t freemiss; /* * If debugging is enabled, then the allocator can add additional * fields and/or padding to every...
1. 如果没有可用端口,返回NULL。2. 若mflags 设IP_MASQ_F_USER位,则 prio = GFP_KERNEL;不然, prio=GFP_ATOMIC。3. 为ms分配空间,若失败,返回NULL。4. MOD_INC_USE_CONUNT。5. 清空ms。6. 初始化ms->timer。7. ms->timer.data = (unsigned long)ms;ms->timer.function = masq_expire;...
__GFP_ATOMIC:调用者处在原子场景中,分配过程不能回收页或者睡眠,一般是中断处理程序会用。__GFP_IO:可以进行磁盘IO操作。__GFP_FS:可以进行文件系统的操作。__GFP_KSWAPD_RECLAIM:当内存不足时允许异步回收。__GFP_RECLAIM:当内存不足时允许同步回收和异步回收。
atomic_read(&system_freezing_cnt))) return false; return freezing_slow_path(p); } linux-src/kernel/freezer.c 代码语言:javascript 复制 bool freezing_slow_path(struct task_struct *p) { if (p->flags & (PF_NOFREEZE | PF_SUSPEND_TASK)) return false; if (test_tsk_thread_flag(p, TIF_...
atomic_long_t owner; spinlock_t wait_lock; #ifdef CONFIG_MUTEX_SPIN_ON_OWNERstructoptimistic_spin_queue osq;/*Spinner MCS lock*/#endifstructlist_head wait_list; #ifdef CONFIG_DEBUG_MUTEXESvoid*magic;#endif#ifdef CONFIG_DEBUG_LOCK_ALLOCstructlockdep_map dep_map;#endif}; ...
所使用的GPIO编号 */atomic_t keyvalue; /* 按键值 */};struct key_dev keydev; /* key 设备 *//** @Brief 初始化按键使用的GPIO管脚* @Call Internal or External* @Param* @Note NOne* @RetVal 无*/int keyio_init(void){keydev.nd = of_find_node_by_path("/key");if(keydev.nd == ...
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