path: root/src/internal/pthread_impl.h
diff options
authorRich Felker <>2018-12-18 12:17:33 -0500
committerRich Felker <>2018-12-18 12:17:33 -0500
commita63c0104e496f7ba78b64be3cd299b41e8cd427f (patch)
treed2d1952cb710fff180e2c98f33d61d1f04fcb461 /src/internal/pthread_impl.h
parentc00cdefa1da17f60b3179704528582ef320e61b8 (diff)
add __timedwait backend workaround for old kernels where futex EINTRs
prior to linux 2.6.22, futex wait could fail with EINTR even for non-interrupting (SA_RESTART) signals. this was no problem provided the caller simply restarted the wait, but sem_[timed]wait is required by POSIX to return when interrupted by a signal. commit a113434cd68ce30642c4995b1caadcd084be6f09 introduced this behavior, and commit c0ed5a201b2bdb6d1896064bec0020c9973db0a1 reverted it based on a mistaken belief that it was not required. this belief stems from a bug in the specification: the description requires the function to return when interrupted, but the errors section marks EINTR as a "may fail" condition rather than a "shall fail" one. since there does seem to be significant value in the change made in commit c0ed5a201b2bdb6d1896064bec0020c9973db0a1, making it so that programs that call sem_wait without checking for EINTR don't silently make forward progress without obtaining the semaphore or treat it as a fatal error and abort, add a behind-the-scenes mechanism in the __timedwait backend to suppress EINTR in programs that have never installed interrupting signal handlers, and have sigaction track and report this state. this way the semaphore code is not cluttered by workarounds and can be updated (to be done in next commit) to reflect the high-level logic for conforming behavior. these changes are based loosely on a patch by Markus Wichmann, with the main changes being atomic update to flag object and moving the workaround from sem_timedwait to the __timedwait futex backend.
Diffstat (limited to 'src/internal/pthread_impl.h')
1 files changed, 1 insertions, 0 deletions
diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h
index 7a25b88e..58ecce90 100644
--- a/src/internal/pthread_impl.h
+++ b/src/internal/pthread_impl.h
@@ -156,6 +156,7 @@ extern hidden volatile int __block_new_threads;
extern hidden volatile size_t __pthread_tsd_size;
extern hidden void *__pthread_tsd_main[];
extern hidden volatile int __aio_fut;
+extern hidden volatile int __eintr_valid_flag;
hidden int __clone(int (*)(void *), void *, int, void *, ...);
hidden int __set_thread_area(void *);