Module rtm

Available on x86 or x86-64 only.

Intel’s Restricted Transactional Memory (RTM).

This CPU feature is available on Intel Broadwell or later CPUs (and some Haswell).

The reference is Intel 64 and IA-32 Architectures Software Developer’s Manual Volume 2: Instruction Set Reference, A-Z.

Wikipedia provides a quick overview of the assembly instructions, and Intel’s programming considerations details what sorts of instructions within a transaction are likely to cause an abort.

Constants

_XABORT_CAPACITYExperimental

Transaction abort due to the transaction using too much memory.

_XABORT_CONFLICTExperimental

Transaction abort due to a memory conflict with another thread.

_XABORT_DEBUGExperimental

Transaction abort due to a debug trap.

_XABORT_EXPLICITExperimental

Transaction explicitly aborted with xabort. The parameter passed to xabort is available with _xabort_code(status).

_XABORT_NESTEDExperimental

Transaction abort in a inner nested transaction.

_XABORT_RETRYExperimental

Transaction retry is possible.

_XBEGIN_STARTEDExperimental

Transaction successfully started.

Functions

x86_xabort 🔒 ^⚠

x86_xbegin 🔒 ^⚠

x86_xend 🔒 ^⚠

x86_xtest 🔒 ^⚠

_xabort^⚠Experimentalrtm

Forces a restricted transactional memory (RTM) region to abort.

_xabort_codeExperimental

Retrieves the parameter passed to _xabort when _xbegin’s status has the _XABORT_EXPLICIT flag set.

_xbegin^⚠Experimentalrtm

Specifies the start of a restricted transactional memory (RTM) code region and returns a value indicating status.

_xend^⚠Experimentalrtm

Specifies the end of a restricted transactional memory (RTM) code region.

_xtest^⚠Experimentalrtm

Queries whether the processor is executing in a transactional region identified by restricted transactional memory (RTM) or hardware lock elision (HLE).