This function directs an IMOD to wait for a POST operation on a stack.
stknum = WAIT(n,[n],[n],...,[n])
Parameters
Number of the stack that satisfied the requirements for ending the wait (or error text).
Number of a stack to wait on. Up to 20 stacks can be waited on. All specified stacks must be empty or WAIT() completes immediately. If multiple stacks are specified, a POST operation that is issued against any stack causes WAIT() to complete.
ARG n MISSING OR INVALID
NO STACKS SPECIFIED
Example
num = wait(1,2,3) /* Wait for a record to appear on any of 3 stacks */ rec = pull(num) /* Read the record that caused the wait to complete */
When a WAIT() is issued against one or more stacks, each specified stack is inspected for existing records. If any records are found, no wait is performed. Following the completion of the function, the number of the first non-empty stack is returned as the result of the function.
When a WAIT() is issued against empty stacks, the IMOD task is suspended. Execution is resumed when another IMOD task uses a function that specifies post, such as PUSH(), QUEUE(), and SHOVE(). The function providing the post can provide accompanying stack records.
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