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

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NAMEutrace_barrier − synchronize with simultaneous tracing callbacks

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SYNOPSISint utrace_barrier(struct task_struct * target, struct utrace_engine * engine);

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

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DESCRIPTIONThis blocks while target might be in the midst of making a callback to engine​. It can be interrupted by signals and will return −ERESTARTSYS​. A return value of zero means no callback from target to engine was in progress​. Any effect of its return value (such as UTRACE_STOP) has already been applied to engine​. It´s not necessary to keep the target pointer alive for this call​. It´s only necessary to hold a ref on engine​. This will return safely even if target has been reaped and has no task refs​. A successful return from utrace_barrier guarantees its ordering with respect to utrace_set_events and utrace_control calls​. If target was not properly stopped, event callbacks just disabled might still be in progress; utrace_barrier waits until there is no chance an unwanted callback can be in progress​. 0

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