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- Log ----------------------------------------------------------------- commit 4aed5269c44032e8ddbeb176d661350542fc05ab Author: Waldemar Brodkorb wbx@uclibc-ng.org Date: Thu Jan 7 23:03:52 2016 +0100

linuxthreads: Implement pthread_tryjoin_np(), pthread_timedjoin_np()

Some applications needs it.

Adapted to master.

Signed-off-by: Leonid Lisovskiy lly.dev@gmail.com Signed-off-by: Waldemar Brodkorb wbx@uclibc-ng.org

-----------------------------------------------------------------------

Summary of changes: libpthread/linuxthreads/join.c | 138 +++++++++++++++++++++ libpthread/linuxthreads/sysdeps/pthread/pthread.h | 15 +++ test/{nptl => pthread}/tst-join2.c | 5 +- test/{nptl => pthread}/tst-join3.c | 5 +- 4 files changed, 159 insertions(+), 4 deletions(-) copy test/{nptl => pthread}/tst-join2.c (93%) copy test/{nptl => pthread}/tst-join3.c (94%)

diff --git a/libpthread/linuxthreads/join.c b/libpthread/linuxthreads/join.c index 4a7c0d8..c7e5479 100644 --- a/libpthread/linuxthreads/join.c +++ b/libpthread/linuxthreads/join.c @@ -192,6 +192,144 @@ int pthread_join(pthread_t thread_id, void ** thread_return) return 0; }

+int pthread_tryjoin_np(pthread_t thread_id, void ** thread_return) +{ + volatile pthread_descr self = thread_self(); + struct pthread_request request; + pthread_handle handle = thread_handle(thread_id); + pthread_descr th; + int result = 0; + + /* Make sure the descriptor is valid. */ + __pthread_lock(&handle->h_lock, self); + if (invalid_handle(handle, thread_id)) { + result = ESRCH; + goto err; + } + th = handle->h_descr; + /* Is the thread joinable?. */ + if (th->p_detached || th->p_joining != NULL) { + result = EINVAL; + goto err; + } + if (th == self) { + result = EDEADLK; + goto err; + } + /* Return right away if the thread hasn't terminated yet. */ + if (! th->p_terminated) { + result = EBUSY; + goto err; + } + + /* Get return value */ + if (thread_return != NULL) *thread_return = th->p_retval; + __pthread_unlock(&handle->h_lock); + /* Send notification to thread manager */ + if (__pthread_manager_request >= 0) { + request.req_thread = self; + request.req_kind = REQ_FREE; + request.req_args.free.thread_id = thread_id; + TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, + (char *) &request, sizeof(request))); + } + return 0; + +err: + __pthread_unlock(&handle->h_lock); + return result; +} + +int pthread_timedjoin_np(pthread_t thread_id, void ** thread_return, + const struct timespec *abstime) +{ + volatile pthread_descr self = thread_self(); + struct pthread_request request; + pthread_handle handle = thread_handle(thread_id); + pthread_descr th; + pthread_extricate_if extr; + int already_canceled = 0; + int result = 0; + PDEBUG("\n"); + + /* Set up extrication interface */ + extr.pu_object = handle; + extr.pu_extricate_func = join_extricate_func; + + __pthread_lock(&handle->h_lock, self); + if (invalid_handle(handle, thread_id)) { + result = ESRCH; + goto err; + } + th = handle->h_descr; + if (th == self) { + result = EDEADLK; + goto err; + } + /* If detached or already joined, error */ + if (th->p_detached || th->p_joining != NULL) { + result = EINVAL; + goto err; + } + /* If not terminated yet, suspend ourselves. */ + if (! th->p_terminated) { + /* Register extrication interface */ + __pthread_set_own_extricate_if(self, &extr); + if (!(THREAD_GETMEM(self, p_canceled) + && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE)) + th->p_joining = self; + else + already_canceled = 1; + __pthread_unlock(&handle->h_lock); + + if (already_canceled) { + __pthread_set_own_extricate_if(self, 0); + __pthread_do_exit(PTHREAD_CANCELED, CURRENT_STACK_FRAME); + } + + PDEBUG("before suspend\n"); + result = (timedsuspend(self, abstime) == 0) ? ETIMEDOUT : 0; + PDEBUG("after suspend\n"); + /* Deregister extrication interface */ + __pthread_set_own_extricate_if(self, 0); + + /* This is a cancellation point */ + if (result == 0 + && THREAD_GETMEM(self, p_woken_by_cancel) + && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) { + THREAD_SETMEM(self, p_woken_by_cancel, 0); + __pthread_do_exit(PTHREAD_CANCELED, CURRENT_STACK_FRAME); + } + __pthread_lock(&handle->h_lock, self); + } + + /* We might have timed out. */ + if (result == 0) { + /* Get return value */ + if (thread_return != NULL) *thread_return = th->p_retval; + } + else + th->p_joining = NULL; + + __pthread_unlock(&handle->h_lock); + + if (result == 0) { + /* Send notification to thread manager */ + if (__pthread_manager_request >= 0) { + request.req_thread = self; + request.req_kind = REQ_FREE; + request.req_args.free.thread_id = thread_id; + TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request, + (char *) &request, sizeof(request))); + } + } + return result; + +err: + __pthread_unlock(&handle->h_lock); + return result; +} + int pthread_detach(pthread_t thread_id) { int terminated; diff --git a/libpthread/linuxthreads/sysdeps/pthread/pthread.h b/libpthread/linuxthreads/sysdeps/pthread/pthread.h index 879bcea..3c7044d 100644 --- a/libpthread/linuxthreads/sysdeps/pthread/pthread.h +++ b/libpthread/linuxthreads/sysdeps/pthread/pthread.h @@ -179,6 +179,21 @@ extern void pthread_exit (void *__retval) __attribute__ ((__noreturn__)); is not NULL. */ extern int pthread_join (pthread_t __th, void **__thread_return);

+#ifdef __USE_GNU +/* Check whether thread TH has terminated. If yes return the status of + the thread in *THREAD_RETURN, if THREAD_RETURN is not NULL. */ +extern int pthread_tryjoin_np (pthread_t __th, void **__thread_return) __THROW; + +/* Make calling thread wait for termination of the thread TH, but only + until TIMEOUT. The exit status of the thread is stored in + *THREAD_RETURN, if THREAD_RETURN is not NULL. + + This function is a cancellation point and therefore not marked with + __THROW. */ +extern int pthread_timedjoin_np (pthread_t __th, void **__thread_return, + __const struct timespec *__abstime); +#endif + /* Indicate that the thread TH is never to be joined with PTHREAD_JOIN. The resources of TH will therefore be freed immediately when it terminates, instead of waiting for another thread to perform PTHREAD_JOIN diff --git a/test/nptl/tst-join2.c b/test/pthread/tst-join2.c similarity index 93% copy from test/nptl/tst-join2.c copy to test/pthread/tst-join2.c index 0320398..2cfab8b 100644 --- a/test/nptl/tst-join2.c +++ b/test/pthread/tst-join2.c @@ -13,8 +13,9 @@ Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - http://www.gnu.org/licenses/. */ + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */

#include <errno.h> #include <pthread.h> diff --git a/test/nptl/tst-join3.c b/test/pthread/tst-join3.c similarity index 94% copy from test/nptl/tst-join3.c copy to test/pthread/tst-join3.c index b25ffd8..df1135f 100644 --- a/test/nptl/tst-join3.c +++ b/test/pthread/tst-join3.c @@ -13,8 +13,9 @@ Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - http://www.gnu.org/licenses/. */ + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */

#include <errno.h> #include <pthread.h>

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