GETTHRID(2) BSD System Calls Manual GETTHRID(2)
getthrid -- get thread identifier
getthrid returns the thread ID of the calling thread. This is used in
the implementation of the thread library (-lpthread) and can appear in
the output of system utilities such as ps(1) and kdump(1).
Thread IDs are not a stable interface and should not be used directly by
applications except for correlation with system utility output. Applica-
tions should use the pthread_t values from pthread_self(3) and
pthread_create(3) to identify threads within the process itself.
This function is always successful, and no return value is reserved to
indicate an error.
__tfork(2), getpid(2), pthread_create(3), pthread_self(3)
The getthrid syscall is specific to OpenBSD and should not be used in
The getthrid syscall appeared in OpenBSD 3.9.
BSD March 30, 2017 BSD