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14-6

14.2 Semaphore

A semaphore can be used to communicate (connect a signal) among tasks

when multiple tasks are synchronized (synchronized control) or when multiple

tasks are not permitted to operate at the same time (exclusive control).

To use a semaphore, create a semaphore with a CREATESEM command to

obtain a semaphore ID. Then a specific semaphore can be designated among

plural semaphores.

When synchronized control or exclusive control is executed, wait for the task

which sends commands to execute a GIVESEM command after a TAKESEM

command has been executed for the task waiting for the instruction of another

task. If the task sending a command is ready, it executes a GIVESEM

command and permits processing of the task which is waiting for a semaphore

to execute.

One GIVESEM command is valid only for a task waiting for one semaphore.

If multiple tasks have a semaphore with the same semaphore ID, the sequence

of task execution can be selected from among two queuing (execution wait)

systems; first-come sequence and priority sequence.

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