100 lines
2.7 KiB
Tcl
100 lines
2.7 KiB
Tcl
# 2010 April 14
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file contains code used by several different test scripts. The
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# code in this file allows testfixture to control another process (or
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# processes) to test locking.
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#
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# Launch another testfixture process to be controlled by this one. A
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# channel name is returned that may be passed as the first argument to proc
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# 'testfixture' to execute a command. The child testfixture process is shut
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# down by closing the channel.
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proc launch_testfixture {} {
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set prg [info nameofexec]
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if {$prg eq ""} {
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set prg [file join . testfixture]
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}
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set chan [open "|$prg tf_main.tcl" r+]
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fconfigure $chan -buffering line
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testfixture $chan "sqlite3_test_control_pending_byte $::sqlite_pending_byte"
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return $chan
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}
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# Execute a command in a child testfixture process, connected by two-way
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# channel $chan. Return the result of the command, or an error message.
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proc testfixture {chan cmd} {
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puts $chan $cmd
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puts $chan OVER
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set r ""
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while { 1 } {
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set line [gets $chan]
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if { $line == "OVER" } {
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return $r
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}
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if {[eof $chan]} {
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return "ERROR: Child process hung up"
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}
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append r $line
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}
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}
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proc testfixture_nb_cb {varname chan} {
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set line [gets $chan]
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if { $line == "OVER" } {
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set $varname $::tfnb($chan)
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unset ::tfnb($chan)
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close $chan
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} else {
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append ::tfnb($chan) $line
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}
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}
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proc testfixture_nb {varname cmd} {
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set chan [launch_testfixture]
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set ::tfnb($chan) ""
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fconfigure $chan -blocking 0 -buffering none
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puts $chan $cmd
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puts $chan OVER
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fileevent $chan readable [list testfixture_nb_cb $varname $chan]
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return ""
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}
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# Write the main loop for the child testfixture processes into file
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# tf_main.tcl. The parent (this script) interacts with the child processes
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# via a two way pipe. The parent writes a script to the stdin of the child
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# process, followed by the word "OVER" on a line of its own. The child
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# process evaluates the script and writes the results to stdout, followed
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# by an "OVER" of its own.
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set f [open tf_main.tcl w]
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puts $f {
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set l [open log w]
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set script ""
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while {![eof stdin]} {
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flush stdout
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set line [gets stdin]
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puts $l "READ $line"
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if { $line == "OVER" } {
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set rc [catch {eval $script} result]
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puts $result
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puts $l "WRITE $result"
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puts OVER
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puts $l "WRITE OVER"
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flush stdout
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set script ""
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} else {
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append script $line
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append script "\n"
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}
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}
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close $l
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}
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close $f
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