UTRACE_BARRIER_PID - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : utrace core API

NAMEutrace_barrier_pid − synchronize with simultaneous tracing callbacks

SYNOPSIS__must_check int utrace_barrier_pid(struct pid * pid, struct utrace_engine * engine);

ARGUMENTSpid thread to affect engine engine to affect (can be detached)

DESCRIPTIONThis is the same as utrace_barrier, but takes a struct pid pointer rather than a struct task_struct pointer​. The caller must hold a ref on pid, but does not need to worry about the task staying valid​. If it´s been reaped so that pid points nowhere, then this call returns −ESRCH​.
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