Counter

NAME

counter - A semaphore-like object for synchronizing across processes

SYNOPSIS

A counter is like an event, but with an integer that can be incremented, decremented, read, or written.

DESCRIPTION

Counter is a synchronization tool allowing processes to coordinate and synchronize their actions. A counter contains a signed 64-bit integer and is somewhat similar to a counting semaphore.

Counter is designed to be used with zx_object_wait_one(), zx_object_wait_many(), or zx_object_wait_async().

SIGNALS

In addition to the standard user signals (ZX_USER_SIGNAL_0 through ZX_USER_SIGNAL_7), counter has two signals that are automatically asserted/deasserted based on the value:

ZX_COUNTER_NON_POSITIVE indicates the value is less than or equal to zero.

ZX_COUNTER_POSITIVE indicates the value is greater than or equal to zero.

SYSCALLS