| wait | block a process statement |
| Syntax | A waitStatement is:
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| Description | The wait statement is used in a concurrent program to cause the executing process to be blocked (to go to sleep) until it is awakened by a signal statement. The statement can only be used inside a monitor (a special kind of module that handles concurrency). A wait statement operates on a condition variable (the variableReference), which is essentially a queue of sleeping processes. See condition for an example of a wait statement.
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| Details | A wait statement for a priority condition must include the optional expn,. This expression must be a non-negative int value which is used to order processes waiting for the condition, low numbers first. A wait statement for a timeout condition must include the optional expn, which must be a non-negative int value which gives the timeout interval. A process waiting for a timeout condition is implicitly awakened if it waits longer than its timeout interval.
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| See also | condition and signal. See also monitor and fork. See also empty. See also pause.
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