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( [id://3333]=superdoc: print w/replies, xml ) Need Help??

On Windows, running this program:

use strict; use warnings; $| = 1; my $cmd = qq{$^X -le "print 'pid=', \$\$"}; for my $i (1..70) { print "$i: run $cmd ---------\n"; my $rc = system(1, $cmd); sleep(1); print "$i: done (rc=$rc).\n"; $rc < 0 and print "$i: ($!)\n"; }
surprised me by producing:

1: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" -------- +- pid=4600 1: done (rc=384). 2: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" -------- +- pid=3036 2: done (rc=4432). 3: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" -------- +- pid=7156 3: done (rc=6364). 4: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" -------- +- pid=5604 4: done (rc=4000). 5: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" -------- +- pid=5784 5: done (rc=2820). 6: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" -------- +- pid=1820 6: done (rc=6592). 7: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" -------- +- pid=6672 7: done (rc=6484). 8: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" -------- +- pid=6452 8: done (rc=4800). 9: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" -------- +- pid=3340 9: done (rc=6652). 10: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4620 10: done (rc=6524). 11: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4240 11: done (rc=224). 12: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=3200 12: done (rc=208). 13: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4120 13: done (rc=4112). 14: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=5324 14: done (rc=1312). 15: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=7032 15: done (rc=6272). 16: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4164 16: done (rc=6884). 17: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4504 17: done (rc=6404). 18: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6292 18: done (rc=6396). 19: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=748 19: done (rc=416). 20: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6804 20: done (rc=1296). 21: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6696 21: done (rc=5712). 22: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4028 22: done (rc=7148). 23: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=3220 23: done (rc=4852). 24: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6788 24: done (rc=92). 25: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6932 25: done (rc=3176). 26: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=960 26: done (rc=5332). 27: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4832 27: done (rc=6928). 28: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=1088 28: done (rc=4500). 29: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=3648 29: done (rc=6456). 30: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6756 30: done (rc=3568). 31: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=332 31: done (rc=1484). 32: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=5624 32: done (rc=5944). 33: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=3612 33: done (rc=6576). 34: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=828 34: done (rc=4408). 35: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=3116 35: done (rc=3172). 36: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4944 36: done (rc=5956). 37: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4752 37: done (rc=3592). 38: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6668 38: done (rc=2780). 39: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6612 39: done (rc=4128). 40: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=2500 40: done (rc=6760). 41: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6808 41: done (rc=4616). 42: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=5252 42: done (rc=2640). 43: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4396 43: done (rc=6368). 44: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=5088 44: done (rc=2604). 45: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6828 45: done (rc=6664). 46: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6012 46: done (rc=6680). 47: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6136 47: done (rc=2980). 48: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6676 48: done (rc=6556). 49: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=5764 49: done (rc=1412). 50: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6720 50: done (rc=3468). 51: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6908 51: done (rc=6156). 52: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=228 52: done (rc=2332). 53: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=5204 53: done (rc=4728). 54: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6236 54: done (rc=5952). 55: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6128 55: done (rc=6924). 56: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=5988 56: done (rc=3900). 57: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6656 57: done (rc=6604). 58: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6432 58: done (rc=32). 59: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=432 59: done (rc=6324). 60: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=2376 60: done (rc=7056). 61: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6384 61: done (rc=3432). 62: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=7152 62: done (rc=5652). 63: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=6764 63: done (rc=6480). 64: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- pid=4336 64: done (rc=5028). 65: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- 65: done (rc=-1). 65: (Resource temporarily unavailable) 66: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- 66: done (rc=-1). 66: (Resource temporarily unavailable) 67: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- 67: done (rc=-1). 67: (Resource temporarily unavailable) 68: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- 68: done (rc=-1). 68: (Resource temporarily unavailable) 69: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- 69: done (rc=-1). 69: (Resource temporarily unavailable) 70: run C:\Strawberry\perl\bin\perl.exe -le "print 'pid=', $$" ------- +-- 70: done (rc=-1). 70: (Resource temporarily unavailable)

That is, there appears to be a limit of 64 processes with the Win32 system(1 hack. Anyone know why? This is just a guess, but I remember that Win32 WaitForMultipleObjects has a limit of 64 handles.

Super search found Getting a return code from waitpid in Windows. I was using the "system(1" hack only out of laziness. I should be able to work around this limitation ... though if I need to go to the bother of calling waitpid etc. I will probably just bite the bullet and use Win32::Process instead.


In reply to Surprised by limitation of Win32 "system(1" hack by eyepopslikeamosquito

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