T-Kernel Specification (1.B0.02)

4.2. TASK-DEPENDENT SYNCHRONIZATION FUNCTIONS 65
tk wai tev
Wait Task Event
[C Language Interface]
INT tevptn = tk_wai_tev ( INT waiptn, TMO tmout ) ;
[Parameters]
INT waiptn Task event pattern
TMO tmout Timeout designation
[Return Parameters]
INT tevptn Task event status when wait released
or Error Code
[Error Codes]
E OK
E PAR
E RLWAI
E DISWAI
E TMOUT
E CTX
Normal completion
Parameter error (waiptn or tmout is invalid)
Wait state released (tk rel wai received in wait state)
Wait released by wait disabled state
Polling failed or timeout
Context error (issued from task-independent portion or in dispatch disabled state)
[Description]
Waits for the occurrence of one of the task events designated in waiptn.
When the wait is released by a task event, the task events designated in waiptn are cleared (raised task
event &= ~waiptn).
The task event status occurring when the wait was released (the state before clearing) is passed in the
return code (tevptn).
The parameters waiptn and tevptn consist of logical OR values of the bits for each task event in the
form 1