Lock/Unlock

[xanatose]

What assembly instructions are available for creating a lightweight mutex on the same process.

I can use CriticalSection on Win32. But I was wondering if there where assembly instructions that where to accomplish the same thing as a CriticalSection but without the need of calling the API.

Also, How does one implement something similar to the InterlockedIncrement, InterlockedAcquire, etc?

[qWord]

hi,

What assembly instructions are available for creating a lightweight mutex on the same process.

I can use CriticalSection on Win32. But I was wondering if there where assembly instructions that where to accomplish the same thing as a CriticalSection but without the need of calling the API.

The problem is that you need to wait for the ownership. Using the PAUSE instruction in a wait loop may be a solution.

Also, How does one implement something similar to the InterlockedIncrement, InterlockedAcquire, etc?

The Interlock* functions are implemented using the LOCK-Instruction prefix (see documentation). Also note, that not all functions are available for x86-32/64.

[dedndave]

LOCK works - bus lock
certain instructions imply bus lock
i sometimes use XCHG EAX,mem32 for that reason
you can change and read a semaphore at the same time