classes available to enable you to build applications that run as multiple processes and share data/objects in shared memory.

class:

sharedmemory

Description:
Sharedmemory provides access to a shared memory segment by multiple processes. It also provides a way for a process to lock the memory for exclusive access.

Properties:

// this is the unique key that identifies the shared memory you want to attach to
key [RW]

// data is a JSON encoded string. use json_encode() and json_decode() to communicate objects between processes
data [RW]

Methods:

// create() specifies the maximum size of the shared memory segment (default is 64KB)
create( size )

// after setting the key you attach to the shared memory
attach ("readonly" | "readwrite")

// or detach from it
detach()

// you can lock it to gain exclusive access while you read or write the data
lock()

// then unlock the access request
unlock()


class:

systemsemaphore

Description:

A semaphore is a generalization of a mutex. Typically, a semaphore is used to protect a certain number of identical resources.

Properties:

// this is the unique key that identifies the system-wide semaphore
key [RW]

Methods:

// acquire exclusive access
acquire()

// release exclusive access
release()

You can use these new classes in Apps that require multiple Lianja windows and communicate data between the processes. These processes may have a GUI or may be just a service running without a GUI.

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