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(7) 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(7),
standards(7)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)
