(PECL sync >= 1.0.0) Waits for the event to be fired/set

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Close shared memory block

(PHP 4, PHP 5, PHP 7) Get process group id for job control

(PHP 5 >= 5.3.4, PHP 7) Retrieve the system error message associated with the given errno

(PECL libevent >= 0.0.1) Abort event loop

(PECL pthreads >= 2.0.0) Synchronization public

(PHP 4, PHP 5, PHP 7) Inserts or updates a variable in shared memory

(PHP 4, PHP 5, PHP 7) Execute an external program

(PECL sync >= 1.0.0) Constructs a new SyncSemaphore object

(PECL libevent >= 0.0.1) Disable a buffered event