CODEWITHSUNDEEP
multithreadingx8664-bitcpuprocessor
grunge fightr
grunge fightr

Reputation: 1370

how the other core call is realized

the program is in the memory and first prosesor executes it, then there is a call to a function which is said to be executed on the other core - how the first core sends the call adres to the other core ? Is there some communication mechanism between the cores other than the shared ram for both?

Upvotes: 0

Views: 45

Answers (1)

Martin James
Martin James

Reputation: 24907

OK, it's like this. Threads cannot be called, only signaled, and function are not, in general, tied to threads - several threads on several cores may be executing the same function/code.

That said, there is certainly an inter-processor driver that can communicate between cores. This is essential to allow threads to be allocated to cores and also to allow the OS to stop threads when a process terminates.

When inter-core comms is required, the producer thread stores data in shared memory and signals the other core by asserting a hardware-interrupt, so forcing the 'target' core to enter the OS and handle the signaled data.

Essentially, none of this is even remotely trivial and, if you wish to know more/have your brain bent out of shape, look at the scheduler/dispatcher code for linux or sign your life away with M$.

Upvotes: 1

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