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| author | Florian Weimer <fweimer@redhat.com> | 2021-09-13 11:06:08 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2021-09-13 11:06:08 +0200 |
| commit | 526c3cf11ee9367344b6b15d669e4c3cb461a2be (patch) | |
| tree | 428aa0c50880ee5001732622b0afe94ba7e113d9 /nptl/descr.h | |
| parent | 8af8456004edbab71f8903a60a3cae442cf6fe69 (diff) | |
| download | glibc-526c3cf11ee9367344b6b15d669e4c3cb461a2be.zip glibc-526c3cf11ee9367344b6b15d669e4c3cb461a2be.tar.gz glibc-526c3cf11ee9367344b6b15d669e4c3cb461a2be.tar.bz2 | |
nptl: Fix race between pthread_kill and thread exit (bug 12889)
A new thread exit lock and flag are introduced. They are used to
detect that the thread is about to exit or has exited in
__pthread_kill_internal, and the signal is not sent in this case.
The test sysdeps/pthread/tst-pthread_cancel-select-loop.c is derived
from a downstream test originally written by Marek Polacek.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'nptl/descr.h')
| -rw-r--r-- | nptl/descr.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/nptl/descr.h b/nptl/descr.h index e1c8831..41ee56f 100644 --- a/nptl/descr.h +++ b/nptl/descr.h @@ -395,6 +395,12 @@ struct pthread PTHREAD_CANCEL_ASYNCHRONOUS). */ unsigned char canceltype; + /* Used in __pthread_kill_internal to detected a thread that has + exited or is about to exit. exit_lock must only be acquired + after blocking signals. */ + bool exiting; + int exit_lock; /* A low-level lock (for use with __libc_lock_init etc). */ + /* Used on strsignal. */ struct tls_internal_t tls_state; |