Before: 
MacBook:core Ammar$ php maintenance/runjobs.php --procs=12
PHP Warning:  Use of undefined constant SIGFPE - assumed 'SIGFPE' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68

Warning: Use of undefined constant SIGFPE - assumed 'SIGFPE' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68
PHP Warning:  Use of undefined constant SIGILL - assumed 'SIGILL' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68

Warning: Use of undefined constant SIGILL - assumed 'SIGILL' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68
PHP Warning:  Use of undefined constant SIGSEGV - assumed 'SIGSEGV' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68

Warning: Use of undefined constant SIGSEGV - assumed 'SIGSEGV' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68
PHP Warning:  Use of undefined constant SIGBUS - assumed 'SIGBUS' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68

Warning: Use of undefined constant SIGBUS - assumed 'SIGBUS' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68
PHP Warning:  Use of undefined constant SIGABRT - assumed 'SIGABRT' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68

Warning: Use of undefined constant SIGABRT - assumed 'SIGABRT' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68
PHP Warning:  Use of undefined constant SIGSYS - assumed 'SIGSYS' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68

Warning: Use of undefined constant SIGSYS - assumed 'SIGSYS' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68
PHP Warning:  Use of undefined constant SIGPIPE - assumed 'SIGPIPE' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68

Warning: Use of undefined constant SIGPIPE - assumed 'SIGPIPE' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68
PHP Warning:  Use of undefined constant SIGXCPU - assumed 'SIGXCPU' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68

Warning: Use of undefined constant SIGXCPU - assumed 'SIGXCPU' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68
PHP Warning:  Use of undefined constant SIGXFSZ - assumed 'SIGXFSZ' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68

Warning: Use of undefined constant SIGXFSZ - assumed 'SIGXFSZ' (this will throw an Error in a future version of PHP) in /Library/WebServer/Documents/core/maintenance/runjobs.php on line 68
[d38a6cd38dc41c083b7fe6c2] [no req]   Error: Call to undefined function pcntl_signal()
Backtrace:
from /Library/WebServer/Documents/core/includes/ForkController.php(92)
#0 /Library/WebServer/Documents/core/maintenance/runjobs.php(69): ForkController->start()
#1 /Library/WebServer/Documents/core/maintenance/doMaintenance.php(112): RunJobs->execute()
#2 /Library/WebServer/Documents/core/maintenance/runjobs.php(130): require_once(string)
#3 {main}


After: 
MacBook:core Ammar$ php maintenance/runjobs.php --procs=12
ForkController requires pcntl_signal extension to be installed.