sysmon_taskq(9) - NetBSD Manual Pages

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SYSMON_TASKQ(9)        NetBSD Kernel Developer's Manual        SYSMON_TASKQ(9)

sysmon_taskq -- general purpose system monitoring task queue
#include <dev/sysmon/sysmon_taskq.h> void sysmon_task_queue_preinit(void); void sysmon_task_queue_init(void); void sysmon_task_queue_fini(void); int sysmon_task_queue_sched(u_int pri, void (*func)(void *), void *arg); void sysmon_task_queue_barrier(u_int pri);
The machine-independent sysmon_taskq provides a simple general purpose task queue. It can be used to run callbacks that require thread context, but do not warrant the use of a more fine-grained solution. Although the intended usage is related to the context of system monitor- ing and power management, also other comparable functions are suitable for sysmon_taskq.
The necessary internal data structures are initialized during system startup by sysmon_task_queue_preinit(). Before actual usage, a machine- dependent procedure should finish the initialization by calling sysmon_task_queue_init(). This will create a kernel thread that can be later halted by sysmon_task_queue_fini(). All scheduled tasks are exe- cuted before the queue is halted. The sysmon_task_queue_sched() function enqueues func to be executed at the priority pri. If pri is 0, the scheduled function will be placed as the last element in the queue. The single argument passed to func is specified by arg. The sysmon_task_queue_barrier() function waits for the completion of all tasks at pri or lower currently queued at the time of the call.
Upon successful completion, sysmon_task_queue_sched() returns 0. Other- wise, the following error values are returned: [EINVAL] An invalid parameter was specified. [ENOMEM] There was not enough memory.
queue(3), kthread(9), workqueue(9)
Jason R. Thorpe <> NetBSD 10.99 January 24, 2010 NetBSD 10.99
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