wait-for

Blocks until a synchronization object is available.

This function is the basic blocking primitive of the Threads library. It blocks until object is available and synchronization can be achieved, or the timeout interval has expired. A non-blocking synchronization may be attempted by specifying a timeout of zero. Individual methods may adjust the state of the synchronization object on synchronization. The function returns #t if synchronization is achieved before the timeout interval elapses; otherwise it returns #f.

Exported from

Modifiers

open

Arguments

object	An instance of <synchronization>.
timeout:	An instance of type-union(<false>, <real>). Time-out interval. If #f, the time-out interval never elapses. Otherwise, the <real> value corresponds to the desired interval in seconds. The default is #f.

Values

success

An instance of <boolean>.

Summary

wait-for	Blocks until a synchronization object is available.
Functions
wait-for

wait-for

Claims a read-write lock, blocking if necessary. The behavior depends on the value of mode

#”read”	If there is a write lock, blocks until the lock becomes free. Then claims the lock by incrementing its internal read-lock counter.
#”write”	First waits until the lock becomes free, by blocking if necessary. Then claims exclusive ownership of the lock in write mode. If the claim is successful, this method returns true; otherwise it returns false.

Arguments

object	An instance of <read-write-lock>.
timeout:	An instance of type-union(<false>, <real>). Time-out interval. If #f, the time-out interval never elapses. Otherwise, the <real> value corresponds to the desired interval in seconds. The default is #f.
mode:	One of #”read”, #”write”. The default is #”read”.

wait-for

Exported from

Modifiers

Arguments

Values

Functions

wait-for

Claims a read-write lock, blocking if necessary. The behavior depends on the value of mode

Arguments