SyncSharedMemory::__construct
(PECL sync >= 1.1.0)
SyncSharedMemory::__construct — Constructs a new SyncSharedMemory object
Description
Constructs a named shared memory object.
Parameters
-
name -
The name of the shared memory object.
Note:
If the name already exists, it must be able to be opened by the current user that the process is running as or an exception will be thrown with a meaningless error message.
-
size -
The size, in bytes, of shared memory to reserve.
Note:
The amount of memory cannot be resized later. Request sufficient storage up front.
Return Values
The new SyncSharedMemory object.
Errors/Exceptions
An exception is thrown if the shared memory object cannot be created or opened.
Examples
Example #1 SyncSharedMemory::__construct() example
<?php
// You will probably need to protect shared memory with other synchronization objects.
// Shared memory goes away when the last reference to it disappears.
$mem = new SyncSharedMemory("AppReportName", 1024);
if ($mem->first())
{
// Do first time initialization work here.
}
$result = $mem->write(json_encode(array("name" => "my_report.txt")));
?>See Also
- SyncSharedMemory::first() - Check to see if the object is the first instance system-wide of named shared memory
- SyncSharedMemory::size() - Returns the size of the named shared memory
- SyncSharedMemory::write() - Copy data to named shared memory
- SyncSharedMemory::read() - Copy data from named shared memory
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