1 files changed, 224 insertions, 0 deletions
diff --git a/Tools/Scripts/parallelcl b/Tools/Scripts/parallelcl
new file mode 100755
index 0000000..8a46365
--- /dev/null
+++ b/Tools/Scripts/parallelcl
@@ -0,0 +1,224 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use File::Basename;
+use File::Spec;
+use File::Temp;
+use POSIX;
+
+sub makeJob(\@$);
+sub forkAndCompileFiles(\@$);
+sub Exec($);
+sub waitForChild(\@);
+sub cleanup(\@);
+
+my $debug = 0;
+
+chomp(my $clexe = `cygpath -u '$ENV{'VS80COMNTOOLS'}/../../VC/bin/cl.exe'`);
+
+if ($debug) {
+    print STDERR "Received " . @ARGV . " arguments:\n";
+    foreach my $arg (@ARGV) {
+        print STDERR "$arg\n";
+    }
+}
+
+my $commandFile;
+foreach my $arg (@ARGV) {
+    if ($arg =~ /^[\/-](E|EP|P)$/) {
+        print STDERR "The invoking process wants preprocessed source, so let's hand off this whole command to the real cl.exe\n" if $debug;
+        Exec("\"$clexe\" \"" . join('" "', @ARGV) . "\"");
+    } elsif ($arg =~ /^@(.*)$/) {
+        chomp($commandFile = `cygpath -u '$1'`);
+    }
+}
+
+die "No command file specified!" unless $commandFile;
+die "Couldn't find $commandFile!" unless -f $commandFile;
+
+my @sources;
+
+open(COMMAND, '<:raw:encoding(UTF16-LE):crlf:utf8', $commandFile) or die "Couldn't open $commandFile!";
+
+# The first line of the command file contains all the options to cl.exe plus the first (possibly quoted) filename
+my $firstLine = <COMMAND>;
+$firstLine =~ s/\r?\n$//;
+
+# To find the start of the first filename, look for either the last space on the line.
+# If the filename is quoted, the last character on the line will be a quote, so look for the quote before that.
+my $firstFileIndex;
+print STDERR "Last character of first line = '" . substr($firstLine, -1, 1) . "'\n" if $debug;
+if (substr($firstLine, -1, 1) eq '"') {
+    print STDERR "First file is quoted\n" if $debug;
+    $firstFileIndex = rindex($firstLine, '"', length($firstLine) - 2);
+} else {
+    print STDERR "First file is NOT quoted\n" if $debug;
+    $firstFileIndex = rindex($firstLine, ' ') + 1;
+}
+
+my $options = substr($firstLine, 0, $firstFileIndex) . join(' ', @ARGV[1 .. $#ARGV]);
+my $possibleFirstFile = substr($firstLine, $firstFileIndex);
+if ($possibleFirstFile =~ /\.(cpp|c)/) {
+    push(@sources, $possibleFirstFile);
+} else {
+    $options .= " $possibleFirstFile";
+}
+
+print STDERR "######## Found options $options ##########\n" if $debug;
+print STDERR "####### Found first source file $sources[0] ########\n" if @sources && $debug;
+
+# The rest of the lines of the command file just contain source files, one per line
+while (my $source = <COMMAND>) {
+    chomp($source);
+    $source =~ s/^\s+//;
+    $source =~ s/\s+$//;
+    push(@sources, $source) if length($source);
+}
+close(COMMAND);
+
+my $numSources = @sources;
+exit unless $numSources > 0;
+
+my $numJobs;
+if ($options =~ s/-j\s*([0-9]+)//) {
+    $numJobs = $1;
+} else {
+    chomp($numJobs = `num-cpus`);
+}
+
+print STDERR "\n\n####### COMPILING $numSources FILES USING AT MOST $numJobs PARALLEL INSTANCES OF cl.exe ###########\n\n";# if $debug;
+
+# Magic determination of job size
+# The hope is that by splitting the source files up into 2*$numJobs pieces, we
+# won't suffer too much if one job finishes much more quickly than another.
+# However, we don't want to split it up too much due to cl.exe overhead, so set
+# the minimum job size to 5.
+my $jobSize = POSIX::ceil($numSources / (2 * $numJobs));
+$jobSize = $jobSize < 5 ? 5 : $jobSize;
+
+print STDERR "######## jobSize = $jobSize ##########\n" if $debug;
+
+# Sort the source files randomly so that we don't end up with big clumps of large files (aka SVG)
+sub fisher_yates_shuffle(\@)
+{
+    my ($array) = @_;
+    for (my $i = @{$array}; --$i; ) {
+        my $j = int(rand($i+1));
+        next if $i == $j;
+        @{$array}[$i,$j] = @{$array}[$j,$i];
+    }
+}
+
+fisher_yates_shuffle(@sources);    # permutes @array in place
+
+my @children;
+my @tmpFiles;
+my $status = 0;
+while (@sources) {
+    while (@sources && @children < $numJobs) {
+        my $pid;
+        my $tmpFile;
+        my $job = makeJob(@sources, $jobSize);
+        ($pid, $tmpFile) = forkAndCompileFiles(@{$job}, $options);
+
+        print STDERR "####### Spawned child with PID $pid and tmpFile $tmpFile ##########\n" if $debug;
+        push(@children, $pid);
+        push(@tmpFiles, $tmpFile);
+    }
+
+    $status |= waitForChild(@children);
+}
+
+while (@children) {
+    $status |= waitForChild(@children);
+}
+cleanup(@tmpFiles);
+
+exit WEXITSTATUS($status);
+
+
+sub makeJob(\@$)
+{
+    my ($files, $jobSize) = @_;
+
+    my @job;
+    if (@{$files} > ($jobSize * 1.5)) {
+        @job = splice(@{$files}, -$jobSize);
+    } else {
+        # Compile all the remaining files in this job to avoid having a small job later
+        @job = splice(@{$files});
+    }
+
+    return \@job;
+}
+
+sub forkAndCompileFiles(\@$)
+{
+    print STDERR "######## forkAndCompileFiles()\n" if $debug;
+    my ($files, $options) = @_;
+
+    if ($debug) {
+        foreach my $file (@{$files}) {
+            print STDERR "######## $file\n";
+        }
+    }
+
+    my (undef, $tmpFile) = File::Temp::tempfile('clcommandXXXXX', DIR => File::Spec->tmpdir, OPEN => 0);
+
+    my $pid = fork();
+    die "Fork failed" unless defined($pid);
+
+    unless ($pid) {
+        # Child process
+        open(TMP, '>:raw:encoding(UTF16-LE):crlf:utf8', $tmpFile) or die "Couldn't open $tmpFile";
+        print TMP "$options\n";
+        foreach my $file (@{$files}) {
+            print TMP "$file\n";
+        }
+        close(TMP);
+        
+        chomp(my $winTmpFile = `cygpath -m $tmpFile`);
+        Exec "\"$clexe\" \@\"$winTmpFile\"";
+    } else {
+        return ($pid, $tmpFile);
+    }
+}
+
+sub Exec($)
+{
+    my ($command) = @_;
+
+    print STDERR "Exec($command)\n" if $debug;
+
+    exec($command);
+}
+
+sub waitForChild(\@)
+{
+    my ($children) = @_;
+
+    return unless @{$children};
+
+    my $deceased = wait();
+    my $status = $?;
+    print STDERR "######## Child with PID $deceased finished ###########\n" if $debug;
+    for (my $i = 0; $i < @{$children}; $i++) {
+        if ($children->[$i] == $deceased) {
+            splice(@{$children}, $i, 1);
+            last;
+        }
+    }
+
+    return $status;
+}
+
+sub cleanup(\@)
+{
+    my ($tmpFiles) = @_;
+
+    foreach my $file (@{$tmpFiles}) {
+        unlink $file;
+    }
+}