41 lines
665 B
Plaintext
41 lines
665 B
Plaintext
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#!/mod/bin/jimsh
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proc _lock_to_port {id} {
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set len [string length $id]
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set hash $len
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for {set i 0} {$i < $len} {incr i} {
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scan [string index $id $i] "%c" asc
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set hash [expr (($hash<<5)^($hash>>27))^$asc];
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}
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return [expr (65535 - ($hash % 101))]
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}
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proc _lock_dummy {newsock addr port} { }
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proc acquire_lock {id} {
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global _locks
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set port [_lock_to_port $id]
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if {[catch {set socket [socket stream.server "127.0.0.1:$port"]} msg]} {
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return 0
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}
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set _locks($id) $socket
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return 1
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}
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proc release_lock {id} {
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global _locks
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if {[catch {close $_locks($id)} msg]} {
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puts "Error releasing lock: $msg"
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return 0
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}
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unset _locks($id)
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return 1
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}
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