17.5.2 Semaphore information
The number of items that can be defined as semaphore information is limited to one for each ID number.
The following shows the semaphore information format.
CRE_SEM (semid, { sematr, isemcnt, maxsem });
|
The items constituting the semaphore information are as follows.
Specifies the ID number for a semaphore.
A value from 0x1 to 0xff, or a name, can be specified for
semid.
Note When a name is specified, the CF850V4 automatically assigns an ID number.
The CF850V4 outputs the relationship between a name and an ID number to the system information header file in the following format:
#define semid value
Specifies the task queuing method for a semaphore.
The keyword that can be specified for
sematr is TA_TFIFO or TA_TPRI.
TA_TFIFO: Task wait queue is in FIFO order.
TA_TPRI: Task wait queue is in task priority order.
3 ) Initial resource count:
isemcnt
4 ) Maximum resource count:
maxsem
Specifies the maximum resource count for a semaphore.
A value from 0x1 to 0xffff can be specified for
maxsem.