2 # Shm.pl: Shared Memory stuff.
8 if (&IsParam("useStrict")) { use strict; }
14 if (defined( $_ = shmget($IPC_PRIVATE, $size, 0777) )) {
15 &status("Created shared memory (shm) key: [$_]");
18 &ERROR("openSHM: failed.");
19 &ERROR("Please delete some shared memory with ipcs or ipcrm.");
28 return '' if (!defined $key);
31 &status("Closed shared memory (shm) key: [$key]");
32 return shmctl($key, $IPC_RMID, 0);
41 if (shmread($key,$retval,$position,$size)) {
44 &ERROR("shmRead: failed: $!");
55 ### TODO: create shmClear to deal with this.
57 my $read = &shmRead($key);
59 $str = $read ."||". $str if ($read ne "");
62 if (!shmwrite($key,$str,$position,$size)) {
63 &ERROR("shmWrite: failed: $!");
71 # Usage: &addForked($name);
72 # Return: 1 for success, 0 for failure.
75 my $forker_timeout = 360; # 6mins, in seconds.
77 &WARN("addForked: name == NULL.");
81 foreach (keys %forked) {
82 my $time = time() - $forked{$_}{Time};
83 next unless ($time > $forker_timeout);
85 ### TODO: use &time2string()?
86 &WARN("Fork: looks like we lost '$_', executed $time ago.");
91 while (scalar keys %forked > 2) { # 2 or more == fail.
94 if ($count > 3) { # 3 seconds.
95 my $list = join(', ', keys %forked);
97 &msg($who, "already running ($list) => exceeded allowed forked processes count (1?).");
99 &status("Fork: I ran too many forked processes :) Giving up $name.");
107 if (exists $forked{$name}) {
108 my $time = $forked{$name}{Time};
109 if (-d "/proc/$forked{$name}{PID}") {
110 &status("fork: still running; good. BAIL OUT.");
112 &status("fork: lost the fork? REMOVE IT!");
115 if (time() - $time > 900) { # stale fork > 15m.
116 &status("forked: forked{$name} presumably exited without notifying us.");
117 $forked{$name}{Time} = time();
119 } else { # fresh fork.
120 &msg($who, "$name is already running ". &Time2String(time() - $forked{$name}));
124 $forked{$name}{Time} = time();
125 $forkedtime = time();
133 if (!defined $name) {
134 &WARN("delForked: name == NULL.");
138 if (exists $forked{$name}) {
139 my $timestr = &Time2String(time() - $forked{$name}{Time});
140 &status("fork: took $timestr for $name.");
141 &shmWrite($shm,"DELETE FORK $name");
144 &ERROR("delForked: forked{$name} does not exist. should not happen.");