QProcess created in another app: Would they share the stack ?

QBst

Hello everyone,
When a QProcess is created in another application (QProcess() called w/o parent means it wouldnt be started as a child process, but as a parallel one, right?) would they share the stack? Do we need to take care with sigaction and SA_ONSTACK ?

jsulm

@QBst Different processes never share stack! Doesn't matter how they were started. Even heap memory is not shared. You need to use "shared memory" to share memory between processes.

JonB

@QBst
Hello and welcome.

No, they are separate processes, no "stack sharing". QProcess just runs an external process.

QBst

Would they share the stack, when created as a child process (w. parent parameter: QProcess(parent) )?

JonB

@JonB said in QProcess created in another app: Would they share the stack ?:

No, they are separate processes, no "stack sharing".

Is that 100% clear? :) parent parameter is to do with Qt's object-ownership hierarchy, nothing to do with sub-process parentage. Sub-process parent will be the Qt program. And still no kind of "stack sharing" :)

jsulm

@QBst Different processes never share stack! Doesn't matter how they were started. Even heap memory is not shared. You need to use "shared memory" to share memory between processes.