THR_EXIT(3C) Standard C Library Functions THR_EXIT(3C)


NAME


thr_exit - terminate the calling thread

SYNOPSIS


cc -mt [ flag... ] file...[ library... ]
#include <thread.h>

void thr_exit(void *status);


DESCRIPTION


The thr_exit() function terminates the calling thread, in a similar way
that exit(3C) terminates the calling process. If the calling thread is
not detached, then the thread's ID and the exit status specified by
status are retained. The value status is then made available to any
successful join with the terminating thread (see thr_join(3C));
otherwise, status is disregarded allowing the thread's ID to be reclaimed
immediately.


Any cancellation cleanup handlers that have been pushed and not yet
popped are popped in the reverse order that they were pushed and then
executed. After all cancellation cleanup handlers have been executed, if
the thread has any thread-specific data, appropriate destructor functions
will be called in an unspecified order. Thread termination does not
release any application visible process resources, including, but not
limited to, mutexes and file descriptors, nor does it perform any process
level cleanup actions, including, but not limited to, calling any
atexit() routines that might exist.


An exiting thread runs with all signals blocked. All thread termination
functions, including cancellation cleanup handlers and thread-specific
data destructor functions, are called with all signals blocked.


If any thread, including the main() thread, calls thr_exit(), only that
thread will exit.


If main() returns or exits (either implicitly or explicitly), or any
thread explicitly calls exit(), the entire process will exit.


The behavior of thr_exit() is undefined if called from a cancellation
cleanup handler or destructor function that was invoked as a result of
either an implicit or explicit call to thr_exit().


After a thread has terminated, the result of access to local (auto)
variables of the thread is undefined. Thus, references to local variables
of the exiting thread should not be used for the thr_exit() status
parameter value.


If any thread (except the main() thread) implicitly or explicitly
returns, the result is the same as if the thread called thr_exit() and it
will return the value of status as the exit code.


The process will terminate with an exit status of 0 after the last non-
daemon thread has terminated (including the main() thread). This behavior
is the same as if the application had called exit() with a 0 argument at
thread termination time.

RETURN VALUES


The thr_exit() function cannot return to its caller.

ERRORS


No errors are defined.

ATTRIBUTES


See attributes(5) for descriptions of the following attributes:


+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT-Level | MT-Safe |
+---------------+-----------------+

SEE ALSO


exit(3C), thr_create(3C), thr_join(3C), thr_keycreate(3C), attributes(5),
standards(5)

NOTES


Although only POSIX implements cancellation, cancellation can be used
with Solaris threads, due to their interoperability.


The status argument should not reference any variables local to the
calling thread.


November 2, 2007 THR_EXIT(3C)