pSOSystem System Calls - Read

ev_send pSOS+ System Calls
ev_send Sends events to a task.
#include
unsigned long ev_send(
unsigned long tid, /* target task identifier */
unsigned long events /* bit-encoded events */
)
Description
Arguments
Return Value
This system call sends events to a task. If the target task is not waiting for events,
the newly sent events are simply made pending. If the task is waiting for events, and
the wait condition is fully satisfied as a result of the new events, then the task is
unblocked and readied for execution. Otherwise, the task continues to wait. In
either case, any of the events sent that do not match those waited on are always left
pending.
Each task has 32 events, which are encoded bit-wise in a single long word. Bits 31
through 16 are for internal system use, and bits 15 through 0 are for user-specific
purposes. ev_send() can send up to 32 different events at one time.
Events are neither queued nor counted. For example, if three identical events are
sent to a task before it issues a wait for that event, the three events have the same
effect as one event.
tid Specifies the task identifier of the target task.
events Contains a list of bit-encoded events.
This system call returns 0 on success, or an error code on failure.
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