class SharedMemory

Defined at line 37 of file ../../third_party/perfetto/include/perfetto/ext/tracing/core/shared_memory.h

An abstract interface that models the shared memory region shared between

Service and Producer. The concrete implementation of this is up to the

transport layer. This can be as simple as a malloc()-ed buffer, if both

Producer and Service are hosted in the same process, or some posix shared

memory for the out-of-process case (see src/unix_rpc).

Both this class and the Factory are subclassed by the transport layer, which

will attach platform specific fields to it (e.g., a unix file descriptor).

Public Methods

void * start ()

Read/write and read-only access to underlying buffer. The non-const method

is implemented in terms of the const one so subclasses need only provide a

single implementation; implementing in the opposite order would be unsafe

since subclasses could effectively mutate state from inside a const method.

N.B. This signature implements "deep const" that ties the constness of this

object to the constness of the underlying buffer, as opposed to "shallow

const" that would have the signature `void* start() const;`; this is less

flexible for callers but prevents corner cases where it's transitively

possible to change this object's state via the controlled memory.

Defined at line 59 of file ../../third_party/perfetto/include/perfetto/ext/tracing/core/shared_memory.h

void ~SharedMemory ()

The transport layer is expected to tear down the resource associated to

this object region when destroyed.

const void * start ()

size_t size ()