pthread_join(3T)pthread_join(3T)NAMEpthread_join() - wait for the termination of a specified thread
SYNOPSISPARAMETERS
thread Thread whose termination is awaited by the caller.
value_ptr Pointer to the location where the exit status of
thread is returned.
DESCRIPTION
The function waits for the termination of the target thread. If the
target thread has already terminated, this function returns immedi‐
ately. Only threads created with a detachstate attribute value of may
be specified in the target thread parameter. On successful return from
the value_ptr argument, if it is not a null pointer, will contain the
value passed to by the terminating thread.
When a call returns successfully, the caller is guaranteed the target
thread has terminated. If more than one thread calls for the same tar‐
get thread, one thread is guaranteed to return successfully. Undefined
behavior results for other callers specifying the same thread.
If the thread calling is canceled, the target thread shall not be
joined. The exit status of the target thread will remain available for
another thread to call
If the target thread was canceled, its exit status is
It is unspecified whether a thread that has exited, but remains
unjoined, counts against the limit.
RETURN VALUE
Upon successful completion, returns zero. Otherwise, an error number is
returned to indicate the error (the variable is not set).
ERRORS
If any of the following occur, the function returns the corresponding
error number:
[EINVAL] The value specified by thread does not refer to a
joinable thread.
[ESRCH] No thread could be found corresponding to thread.
For each of the following conditions, if the condition is detected, the
function returns the corresponding error number:
[EDEADLK] This operation would result in process deadlock
or thread specifies the calling thread.
AUTHOR
was derived from the IEEE POSIX P1003.1c standard.
SEE ALSOpthread_create(3T), wait(2).
STANDARDS CONFORMANCE
Pthread Library pthread_join(3T)
