include/linux/async.h

Source file repositories/reference/linux-study-clean/include/linux/async.h

File Facts

System
Linux kernel
Corpus path
include/linux/async.h
Extension
.h
Size
4469 bytes
Lines
125
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct async_domain {
	struct list_head pending;
	unsigned registered:1;
};

/*
 * domain participates in global async_synchronize_full
 */
#define ASYNC_DOMAIN(_name) \
	struct async_domain _name = { .pending = LIST_HEAD_INIT(_name.pending),	\
				      .registered = 1 }

/*
 * domain is free to go out of scope as soon as all pending work is
 * complete, this domain does not participate in async_synchronize_full
 */
#define ASYNC_DOMAIN_EXCLUSIVE(_name) \
	struct async_domain _name = { .pending = LIST_HEAD_INIT(_name.pending), \
				      .registered = 0 }

async_cookie_t async_schedule_node(async_func_t func, void *data,
				   int node);
async_cookie_t async_schedule_node_domain(async_func_t func, void *data,
					  int node,
					  struct async_domain *domain);

/**
 * async_schedule - schedule a function for asynchronous execution
 * @func: function to execute asynchronously
 * @data: data pointer to pass to the function
 *
 * Returns an async_cookie_t that may be used for checkpointing later.
 * Note: This function may be called from atomic or non-atomic contexts.
 */
static inline async_cookie_t async_schedule(async_func_t func, void *data)
{
	return async_schedule_node(func, data, NUMA_NO_NODE);
}

/**
 * async_schedule_domain - schedule a function for asynchronous execution within a certain domain
 * @func: function to execute asynchronously
 * @data: data pointer to pass to the function
 * @domain: the domain
 *
 * Returns an async_cookie_t that may be used for checkpointing later.
 * @domain may be used in the async_synchronize_*_domain() functions to
 * wait within a certain synchronization domain rather than globally.
 * Note: This function may be called from atomic or non-atomic contexts.
 */
static inline async_cookie_t
async_schedule_domain(async_func_t func, void *data,
		      struct async_domain *domain)
{
	return async_schedule_node_domain(func, data, NUMA_NO_NODE, domain);
}

/**
 * async_schedule_dev - A device specific version of async_schedule
 * @func: function to execute asynchronously
 * @dev: device argument to be passed to function
 *
 * Returns an async_cookie_t that may be used for checkpointing later.
 * @dev is used as both the argument for the function and to provide NUMA
 * context for where to run the function. By doing this we can try to
 * provide for the best possible outcome by operating on the device on the
 * CPUs closest to the device.
 * Note: This function may be called from atomic or non-atomic contexts.
 */
static inline async_cookie_t
async_schedule_dev(async_func_t func, struct device *dev)
{
	return async_schedule_node(func, dev, dev_to_node(dev));
}

bool async_schedule_dev_nocall(async_func_t func, struct device *dev);

/**
 * async_schedule_dev_domain - A device specific version of async_schedule_domain
 * @func: function to execute asynchronously
 * @dev: device argument to be passed to function
 * @domain: the domain
 *
 * Returns an async_cookie_t that may be used for checkpointing later.
 * @dev is used as both the argument for the function and to provide NUMA
 * context for where to run the function. By doing this we can try to
 * provide for the best possible outcome by operating on the device on the
 * CPUs closest to the device.
 * @domain may be used in the async_synchronize_*_domain() functions to
 * wait within a certain synchronization domain rather than globally.

Annotation

Implementation Notes