Struct rseq_t
#[repr(C)]pub struct rseq_t {
pub cpu_id_start: u32,
pub cpu_id: u32,
pub rseq_cs: rseq_cs_union_t,
pub flags: u32,
}dep_nc only.Expand description
struct rseq is aligned on 4 * 8 bytes to ensure it is always contained within a single cache-line.
A single struct rseq per thread is allowed.
Fields§
§cpu_id_start: u32Restartable sequences cpu_id_start field. Updated by the
kernel. Read by user-space with single-copy atomicity
semantics. This field should only be read by the thread which
registered this data structure. Aligned on 32-bit. Always
contains a value in the range of possible CPUs, although the
value may not be the actual current CPU (e.g. if rseq is not
initialized). This CPU number value should always be compared
against the value of the cpu_id field before performing a rseq
commit or returning a value read from a data structure indexed
using the cpu_id_start value.
cpu_id: u32Restartable sequences cpu_id field. Updated by the kernel.
Read by user-space with single-copy atomicity semantics. This
field should only be read by the thread which registered this
data structure. Aligned on 32-bit. Values
RSEQ_CPU_ID_UNINITIALIZED and RSEQ_CPU_ID_REGISTRATION_FAILED
have a special semantic: the former means “rseq uninitialized”,
and latter means “rseq initialization failed”. This value is
meant to be read within rseq critical sections and compared
with the cpu_id_start value previously read, before performing
the commit instruction, or read and compared with the
cpu_id_start value before returning a value loaded from a data
structure indexed using the cpu_id_start value.
rseq_cs: rseq_cs_union_tRestartable sequences rseq_cs field.
Contains NULL when no critical section is active for the current
thread, or holds a pointer to the currently active struct rseq_cs.
Updated by user-space, which sets the address of the currently
active rseq_cs at the beginning of assembly instruction sequence
block, and set to NULL by the kernel when it restarts an assembly
instruction sequence block, as well as when the kernel detects that
it is preempting or delivering a signal outside of the range
targeted by the rseq_cs. Also needs to be set to NULL by user-space
before reclaiming memory that contains the targeted struct rseq_cs.
Read and set by the kernel. Set by user-space with single-copy atomicity semantics. This field should only be updated by the thread which registered this data structure. Aligned on 64-bit.
flags: u32Restartable sequences flags field.
This field should only be updated by the thread which registered this data structure. Read by the kernel. Mainly used for single-stepping through rseq critical sections with debuggers.
RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPTInhibit instruction sequence block restart on preemption for this thread.RSEQ_CS_FLAG_NO_RESTART_ON_SIGNALInhibit instruction sequence block restart on signal delivery for this thread.RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATEInhibit instruction sequence block restart on migration for this thread.
Trait Implementations§
Auto Trait Implementations§
impl Freeze for rseq_t
impl RefUnwindSafe for rseq_t
impl Send for rseq_t
impl Sync for rseq_t
impl Unpin for rseq_t
impl UnwindSafe for rseq_t
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