sysread / ipc-pleather Goto Github PK
View Code? Open in Web Editor NEWEasy to use concurrency primitives for Perl, inspired by Cilk
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Fix for recursion
I came across your module recently and enjoyed reading the source. Unfortunately, the module hangs when running fib(big_number). I noticed that $DEPTH is defined, but missing $MAXDEPTH. The following small change allowed me to run fib(35) to completion.
--- Pleather.pm.orig 2017-11-11 17:42:41.000000000 -0600
+++ Pleather.pm 2022-09-23 12:16:30.204743424 -0500
@@ -17,6 +17,11 @@
our $PID = $$;
our $SEM = IPC::Semaphore->new(IPC_PRIVATE, 1, S_IRUSR|S_IWUSR|IPC_CREAT);
our $DEPTH = 0;
+our $MAXDEPTH = int(log2($AnyEvent::Util::MAX_FORKS / 2)); # 2 spawns in block
+
+sub log2 {
+ log($_[0]) / log(2);
+}
our $SEMGUARD = guard {
$SEM->remove;
@@ -32,7 +37,7 @@
sub spawn {
my ($code, @args) = @_;
- if (!$AnyEvent::CondVar::Base::WAITING && sdec) {
+ if ($DEPTH < $MAXDEPTH && !$AnyEvent::CondVar::Base::WAITING && sdec) {
my $cv = AE::cv;
fork_call {Thank you, for introducing me to Keyword::Declare and Keyword::Simple. Moreover, showcasing sset, sdec, and sinc.
Blessings and grace!
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