Shared Data with Mutex

[sweep123]

I am using the following scheme to share data between multiple instances of the same application.

#pragma data_seg(".ID_DATA&quot

bool volatile gbID_1 = false; // In use flag for ID 1
bool volatile gbID_2 = false; // In use flag for ID 2
bool volatile gbID_3 = false; // In use flag for ID 3
bool volatile gbID_4 = false; // In use flag for ID 4
bool volatile gbKeyPressedID_1 = false; // Key pressed flag for ID 1
bool volatile gbKeyPressedID_2 = false; // Key pressed flag for ID 2
bool volatile gbKeyPressedID_3 = false; // Key pressed for ID 3 ID 1 handle
bool volatile gbKeyPressedID_4 = false; // Key pressed for ID 3 ID 1 handle
ANDLE volatile ghIDMutex = NULL; // Mutex for controlled access to this data area

#pragma data_seg()
#pragma comment(linker, "/SECTION:.ID_DATA,RWS&quot

I am using a Mutex (which is in this shared data - ghIDMutex )to protect this data, but could I have the main task that kicks off all these instances create the Mutex.

From what I have tried so far the Mutex is 0 in the other applications.

Any comments?

Sweep

 

[MKuiper]

Sweep,

You can NOT use the handle which was created by an instance in other instances of the program.
What you need to do is creating a named mutex. All instances must call CreateMutex, specifying the same name. That will redirect them to the same mutex.


Marcel

 

[sweep123]

So if all instances use the same name i.e.
ghIDUMutex = CreateMutex(NULL, FALSE, "ID Mutex" // Create Mutex for shared area

One other question can Task A which uses CreateProcess("Task B&quot to kick off several instances of Task B's all share this data
#pragma data_seg(".ID_DATA&quot
- and Mutex - if all use the same name.

Regards,

Sweep123