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author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2020-06-23 22:43:32 +0000 |
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committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2020-06-24 01:19:49 +0200 |
commit | eca16db02d660242e709d4b8a11a2c5b94cca540 (patch) | |
tree | fda5e40a34d5d16179bff5718f0e80a89825e639 /sysdeps/pthread/tst-cancel13.c | |
parent | 3513d5af3d111f322cf2b64f2c7d415ea923bf25 (diff) | |
download | glibc-eca16db02d660242e709d4b8a11a2c5b94cca540.tar.gz glibc-eca16db02d660242e709d4b8a11a2c5b94cca540.tar.xz glibc-eca16db02d660242e709d4b8a11a2c5b94cca540.zip |
htl: Make sem_*wait cancellations points
By aligning its implementation on pthread_cond_wait. * sysdeps/htl/sem-timedwait.c (cancel_ctx): New structure. (cancel_hook): New function. (__sem_timedwait_internal): Check for cancellation and register cancellation hook that wakes the thread up, and check again for cancellation on exit. * nptl/tst-cancel13.c, nptl/tst-cancelx13.c: Move to... * sysdeps/pthread/: ... here. * nptl/Makefile: Move corresponding references and rules to... * sysdeps/pthread/Makefile: ... here.
Diffstat (limited to 'sysdeps/pthread/tst-cancel13.c')
-rw-r--r-- | sysdeps/pthread/tst-cancel13.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/sysdeps/pthread/tst-cancel13.c b/sysdeps/pthread/tst-cancel13.c new file mode 100644 index 0000000000..0b0086c4d3 --- /dev/null +++ b/sysdeps/pthread/tst-cancel13.c @@ -0,0 +1,127 @@ +/* Test sem_wait cancellation for contended case. + Copyright (C) 2003-2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2003. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + 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 + <https://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <pthread.h> +#include <semaphore.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + + +static pthread_barrier_t bar; +static sem_t sem; + + +static void +cleanup (void *arg) +{ + static int ncall; + + if (++ncall != 1) + { + puts ("second call to cleanup"); + exit (1); + } +} + + +static void * +tf (void *arg) +{ + pthread_cleanup_push (cleanup, NULL); + + int e = pthread_barrier_wait (&bar); + if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD) + { + puts ("error: tf: 1st barrier_wait failed"); + exit (1); + } + + /* This call should block and be cancelable. */ + sem_wait (&sem); + + pthread_cleanup_pop (0); + + return NULL; +} + + +static int +do_test (void) +{ + pthread_t th; + + if (pthread_barrier_init (&bar, NULL, 2) != 0) + { + puts ("error: barrier_init failed"); + exit (1); + } + + /* A value equal to 0 will check for contended pthread cancellation, + where the sem_wait operation will block. */ + if (sem_init (&sem, 0, 0) != 0) + { + puts ("error: sem_init failed"); + exit (1); + } + + if (pthread_create (&th, NULL, tf, NULL) != 0) + { + puts ("error: create failed"); + exit (1); + } + + int e = pthread_barrier_wait (&bar); + if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD) + { + puts ("error: 1st barrier_wait failed"); + exit (1); + } + + /* Give the child a chance to go to sleep in sem_wait. */ + sleep (1); + + /* Check whether cancellation is honored when waiting in sem_wait. */ + if (pthread_cancel (th) != 0) + { + puts ("error: 1st cancel failed"); + exit (1); + } + + void *r; + if (pthread_join (th, &r) != 0) + { + puts ("error: join failed"); + exit (1); + } + + if (r != PTHREAD_CANCELED) + { + puts ("thread not canceled"); + exit (1); + } + + return 0; +} + + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" |