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58 lines
1.7 KiB
Tcl
58 lines
1.7 KiB
Tcl
# Sentinel file wrapper for multi-process tests.
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# This is designed to avoid a set of nasty bugs, primarily on Windows,
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# where pid reuse causes watch_procs to sit around waiting for some
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# random process that's not DB's and is not exiting.
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source ./include.tcl
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# Arguments:
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#
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if { $argc < 3 } {
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puts "FAIL: wrap.tcl: Usage: wrap.tcl script log scriptargs"
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exit
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}
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set script [lindex $argv 0]
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set logfile [lindex $argv 1]
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set args [lrange $argv 2 end]
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# Create a sentinel file to mark our creation and signal that watch_procs
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# should look for us.
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set parentpid [pid]
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set parentsentinel $testdir/begin.$parentpid
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set f [open $parentsentinel w]
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close $f
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# Create a Tcl subprocess that will actually run the test.
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set t [open "|$tclsh_path >& $logfile" w]
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# Create a sentinel for the subprocess.
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set childpid [pid $t]
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puts "Script watcher process $parentpid launching $script process $childpid."
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set childsentinel $testdir/begin.$childpid
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set f [open $childsentinel w]
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close $f
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# Set up argv for the subprocess, since the args aren't passed in as true
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# arguments thanks to the pipe structure.
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puts $t "set argc [llength $args]"
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puts $t "set argv [list $args]"
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# Command the test to run.
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puts $t "source $test_path/$script"
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# Close the pipe. This will flush the above commands and actually run the
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# test, and will also return an error a la exec if anything bad happens
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# to the subprocess. The magic here is that closing a pipe blocks
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# and waits for the exit of processes in the pipeline, at least according
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# to Ousterhout (p. 115).
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set ret [catch {close $t} res]
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# Write ending sentinel files--we're done.
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set f [open $testdir/end.$childpid w]
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close $f
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set f [open $testdir/end.$parentpid w]
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close $f
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exit $ret
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