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![Rusty Russell](/assets/img/avatar_default.png)
Impact: introduce new APIs We want to deprecate cpumasks on the stack, as we are headed for gynormous numbers of CPUs. Eventually, we want to head towards an undefined 'struct cpumask' so they can never be declared on stack. 1) New cpumask functions which take pointers instead of copies. (cpus_* -> cpumask_*) 2) Several new helpers to reduce requirements for temporary cpumasks (cpumask_first_and, cpumask_next_and, cpumask_any_and) 3) Helpers for declaring cpumasks on or offstack for large NR_CPUS (cpumask_var_t, alloc_cpumask_var and free_cpumask_var) 4) 'struct cpumask' for explicitness and to mark new-style code. 5) Make iterator functions stop at nr_cpu_ids (a runtime constant), not NR_CPUS for time efficiency and for smaller dynamic allocations in future. 6) cpumask_copy() so we can allocate less than a full cpumask eventually (for alloc_cpumask_var), and so we can eliminate the 'struct cpumask' definition eventually. 7) work_on_cpu() helper for doing task on a CPU, rather than saving old cpumask for current thread and manipulating it. 8) smp_call_function_many() which is smp_call_function_mask() except taking a cpumask pointer. Note that this patch simply introduces the new functions and leaves the obsolescent ones in place. This is to simplify the transition patches. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
251 lines
6.9 KiB
C
251 lines
6.9 KiB
C
/*
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* workqueue.h --- work queue handling for Linux.
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*/
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#ifndef _LINUX_WORKQUEUE_H
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#define _LINUX_WORKQUEUE_H
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#include <linux/timer.h>
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#include <linux/linkage.h>
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#include <linux/bitops.h>
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#include <linux/lockdep.h>
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#include <asm/atomic.h>
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struct workqueue_struct;
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struct work_struct;
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typedef void (*work_func_t)(struct work_struct *work);
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/*
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* The first word is the work queue pointer and the flags rolled into
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* one
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*/
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#define work_data_bits(work) ((unsigned long *)(&(work)->data))
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struct work_struct {
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atomic_long_t data;
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#define WORK_STRUCT_PENDING 0 /* T if work item pending execution */
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#define WORK_STRUCT_FLAG_MASK (3UL)
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#define WORK_STRUCT_WQ_DATA_MASK (~WORK_STRUCT_FLAG_MASK)
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struct list_head entry;
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work_func_t func;
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#ifdef CONFIG_LOCKDEP
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struct lockdep_map lockdep_map;
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#endif
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};
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#define WORK_DATA_INIT() ATOMIC_LONG_INIT(0)
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struct delayed_work {
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struct work_struct work;
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struct timer_list timer;
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};
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struct execute_work {
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struct work_struct work;
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};
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#ifdef CONFIG_LOCKDEP
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/*
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* NB: because we have to copy the lockdep_map, setting _key
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* here is required, otherwise it could get initialised to the
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* copy of the lockdep_map!
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*/
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#define __WORK_INIT_LOCKDEP_MAP(n, k) \
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.lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
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#else
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#define __WORK_INIT_LOCKDEP_MAP(n, k)
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#endif
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#define __WORK_INITIALIZER(n, f) { \
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.data = WORK_DATA_INIT(), \
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.entry = { &(n).entry, &(n).entry }, \
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.func = (f), \
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__WORK_INIT_LOCKDEP_MAP(#n, &(n)) \
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}
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#define __DELAYED_WORK_INITIALIZER(n, f) { \
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.work = __WORK_INITIALIZER((n).work, (f)), \
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.timer = TIMER_INITIALIZER(NULL, 0, 0), \
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}
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#define DECLARE_WORK(n, f) \
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struct work_struct n = __WORK_INITIALIZER(n, f)
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#define DECLARE_DELAYED_WORK(n, f) \
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struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f)
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/*
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* initialize a work item's function pointer
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*/
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#define PREPARE_WORK(_work, _func) \
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do { \
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(_work)->func = (_func); \
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} while (0)
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#define PREPARE_DELAYED_WORK(_work, _func) \
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PREPARE_WORK(&(_work)->work, (_func))
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/*
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* initialize all of a work item in one go
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*
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* NOTE! No point in using "atomic_long_set()": useing a direct
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* assignment of the work data initializer allows the compiler
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* to generate better code.
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*/
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#ifdef CONFIG_LOCKDEP
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#define INIT_WORK(_work, _func) \
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do { \
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static struct lock_class_key __key; \
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\
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(_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
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lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0);\
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INIT_LIST_HEAD(&(_work)->entry); \
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PREPARE_WORK((_work), (_func)); \
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} while (0)
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#else
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#define INIT_WORK(_work, _func) \
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do { \
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(_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
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INIT_LIST_HEAD(&(_work)->entry); \
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PREPARE_WORK((_work), (_func)); \
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} while (0)
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#endif
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#define INIT_DELAYED_WORK(_work, _func) \
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do { \
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INIT_WORK(&(_work)->work, (_func)); \
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init_timer(&(_work)->timer); \
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} while (0)
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#define INIT_DELAYED_WORK_DEFERRABLE(_work, _func) \
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do { \
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INIT_WORK(&(_work)->work, (_func)); \
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init_timer_deferrable(&(_work)->timer); \
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} while (0)
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/**
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* work_pending - Find out whether a work item is currently pending
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* @work: The work item in question
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*/
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#define work_pending(work) \
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test_bit(WORK_STRUCT_PENDING, work_data_bits(work))
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/**
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* delayed_work_pending - Find out whether a delayable work item is currently
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* pending
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* @work: The work item in question
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*/
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#define delayed_work_pending(w) \
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work_pending(&(w)->work)
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/**
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* work_clear_pending - for internal use only, mark a work item as not pending
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* @work: The work item in question
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*/
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#define work_clear_pending(work) \
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clear_bit(WORK_STRUCT_PENDING, work_data_bits(work))
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extern struct workqueue_struct *
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__create_workqueue_key(const char *name, int singlethread,
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int freezeable, int rt, struct lock_class_key *key,
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const char *lock_name);
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#ifdef CONFIG_LOCKDEP
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#define __create_workqueue(name, singlethread, freezeable, rt) \
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({ \
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static struct lock_class_key __key; \
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const char *__lock_name; \
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\
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if (__builtin_constant_p(name)) \
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__lock_name = (name); \
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else \
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__lock_name = #name; \
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\
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__create_workqueue_key((name), (singlethread), \
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(freezeable), (rt), &__key, \
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__lock_name); \
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})
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#else
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#define __create_workqueue(name, singlethread, freezeable, rt) \
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__create_workqueue_key((name), (singlethread), (freezeable), (rt), \
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NULL, NULL)
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#endif
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#define create_workqueue(name) __create_workqueue((name), 0, 0, 0)
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#define create_rt_workqueue(name) __create_workqueue((name), 0, 0, 1)
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#define create_freezeable_workqueue(name) __create_workqueue((name), 1, 1, 0)
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#define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0, 0)
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extern void destroy_workqueue(struct workqueue_struct *wq);
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extern int queue_work(struct workqueue_struct *wq, struct work_struct *work);
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extern int queue_work_on(int cpu, struct workqueue_struct *wq,
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struct work_struct *work);
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extern int queue_delayed_work(struct workqueue_struct *wq,
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struct delayed_work *work, unsigned long delay);
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extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
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struct delayed_work *work, unsigned long delay);
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extern void flush_workqueue(struct workqueue_struct *wq);
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extern void flush_scheduled_work(void);
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extern int schedule_work(struct work_struct *work);
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extern int schedule_work_on(int cpu, struct work_struct *work);
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extern int schedule_delayed_work(struct delayed_work *work, unsigned long delay);
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extern int schedule_delayed_work_on(int cpu, struct delayed_work *work,
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unsigned long delay);
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extern int schedule_on_each_cpu(work_func_t func);
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extern int current_is_keventd(void);
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extern int keventd_up(void);
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extern void init_workqueues(void);
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int execute_in_process_context(work_func_t fn, struct execute_work *);
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extern int flush_work(struct work_struct *work);
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extern int cancel_work_sync(struct work_struct *work);
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/*
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* Kill off a pending schedule_delayed_work(). Note that the work callback
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* function may still be running on return from cancel_delayed_work(), unless
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* it returns 1 and the work doesn't re-arm itself. Run flush_workqueue() or
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* cancel_work_sync() to wait on it.
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*/
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static inline int cancel_delayed_work(struct delayed_work *work)
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{
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int ret;
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ret = del_timer_sync(&work->timer);
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if (ret)
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work_clear_pending(&work->work);
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return ret;
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}
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extern int cancel_delayed_work_sync(struct delayed_work *work);
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/* Obsolete. use cancel_delayed_work_sync() */
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static inline
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void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
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struct delayed_work *work)
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{
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cancel_delayed_work_sync(work);
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}
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/* Obsolete. use cancel_delayed_work_sync() */
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static inline
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void cancel_rearming_delayed_work(struct delayed_work *work)
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{
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cancel_delayed_work_sync(work);
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}
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#ifndef CONFIG_SMP
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static inline long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
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{
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return fn(arg);
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}
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#else
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long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg);
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#endif /* CONFIG_SMP */
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#endif
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