Starts a watchdog timer.
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/watchdog.h>void w_start ( w)
struct watchdog *w;
| Item | Description |
|---|---|
| w | Specifies the watchdog timer structure. |
The watchdog timers, including the w_start kernel service, are typically used to verify that an I/O operation completes in a reasonable time. The w_start and w_stop kernel services are designed to allow the timer to be started and stopped efficiently. The kernel decrements the w->count watchdog count every second. The kernel calls the w->func watchdog timer function when the w->count watchdog count reaches 0. A watchdog timer is ignored when the w->count watchdog count is less than or equal to 0.
The w_start kernel service sets the w->count watchdog count to a value of w->restart.
Attention: The watchdog structure must be pinned when the w_start kernel service is called. It must remain pinned until after the call to the w_clear kernel service. During this time, the watchdog structure must not be altered except by the watchdog services.
The w_start kernel service can be called from the process and interrupt environments.
The w_start kernel service has no return values.