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############################################################################
#
# File: evinit.icn
#
# Subject: Procedures for event monitoring
#
# Author: Ralph E. Griswold
#
# Date: November 5, 1995
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This file provides initialization for event monitors.
#
# This file is intended for use with event monitors running under
# MT Icon.
#
############################################################################
$include "evdefs.icn"
procedure EvInit(f,input,output,error)
if not MTEvInit(f,input,output,error) then fail
return
end
procedure EvTerm(win)
if &eventsource === (Monitored | EventSource) then {
if type(win) == "window" then
Event(win)
}
end
#
# MultiThread EventMon support, from file mtsupport.icn
#
global Monitored, EventSource, MTEventMask
#
# If EvInit is called with a string or a list, run as a standalone MT-based
# event monitor -- load the icode file and overload certain EvMon symbols.
#
# This operation is skipped if &eventsource has already been initialized,
# presumably by some event broker such as Eve.
#
procedure MTEvInit(f,input,output,error)
if \&eventsource then return
if type(f) == "string" then {
&eventsource := EventSource := Monitored := load(f,,input,output,error) | fail
EvGet :=: MTEvGet
}
else if type(f) == "list" then {
&eventsource := EventSource := Monitored := load(f[1],f[2:0],input,output,error) | fail
EvGet :=: MTEvGet
}
return &eventsource
end
procedure MTEvGet(c,flag)
static lastcset
initial {
lastcset := ''
}
if c ~=== lastcset then {
lastcset := c
eventmask(\(Monitored | EventSource) ,\c | &cset,&main)
}
return MTEvGet(c,flag)
end
#
# Eve-specific extensions to the general model
#
procedure EvQuit()
EvSignal("quit")
end
procedure EvSignal(x)
if type(x) == "cset" then
write(&errout, "EvSignal(", image(x), ") is ambiguous.")
return x @ &eventsource
end
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