diff options
| -rw-r--r-- | nptl/pthread_join_common.c | 76 | ||||
| -rw-r--r-- | sysdeps/nptl/futex-internal.h | 49 |
2 files changed, 18 insertions, 107 deletions
diff --git a/nptl/pthread_join_common.c b/nptl/pthread_join_common.c index 67d8e2b..4293b07 100644 --- a/nptl/pthread_join_common.c +++ b/nptl/pthread_join_common.c @@ -32,55 +32,6 @@ cleanup (void *arg) atomic_compare_exchange_weak_acquire (&arg, &self, NULL); } -/* The kernel notifies a process which uses CLONE_CHILD_CLEARTID via futex - wake-up when the clone terminates. The memory location contains the - thread ID while the clone is running and is reset to zero by the kernel - afterwards. The kernel up to version 3.16.3 does not use the private futex - operations for futex wake-up when the clone terminates. */ -static int -clockwait_tid (pid_t *tidp, clockid_t clockid, - const struct __timespec64 *abstime) -{ - pid_t tid; - int ret; - - if (! valid_nanoseconds (abstime->tv_nsec)) - return EINVAL; - - /* Repeat until thread terminated. */ - while ((tid = *tidp) != 0) - { - struct __timespec64 rt; - - /* Get the current time. This can only fail if clockid is - invalid. */ - if (__glibc_unlikely (__clock_gettime64 (clockid, &rt))) - return EINVAL; - - /* Compute relative timeout. */ - rt.tv_sec = abstime->tv_sec - rt.tv_sec; - rt.tv_nsec = abstime->tv_nsec - rt.tv_nsec; - if (rt.tv_nsec < 0) - { - rt.tv_nsec += 1000000000; - --rt.tv_sec; - } - - /* Already timed out? */ - if (rt.tv_sec < 0) - return ETIMEDOUT; - - /* If *tidp == tid, wait until thread terminates or the wait times out. - The kernel up to version 3.16.3 does not use the private futex - operations for futex wake-up when the clone terminates. */ - ret = futex_timed_wait_cancel64 (tidp, tid, &rt, LLL_SHARED); - if (ret == -ETIMEDOUT || ret == -EOVERFLOW) - return -ret; - } - - return 0; -} - int __pthread_clockjoin_ex (pthread_t threadid, void **thread_return, clockid_t clockid, @@ -137,15 +88,24 @@ __pthread_clockjoin_ex (pthread_t threadid, void **thread_return, un-wait-ed for again. */ pthread_cleanup_push (cleanup, &pd->joinid); - if (abstime != NULL) - result = clockwait_tid (&pd->tid, clockid, abstime); - else - { - pid_t tid; - /* We need acquire MO here so that we synchronize with the - kernel's store to 0 when the clone terminates. (see above) */ - while ((tid = atomic_load_acquire (&pd->tid)) != 0) - lll_futex_wait_cancel (&pd->tid, tid, LLL_SHARED); + /* We need acquire MO here so that we synchronize with the + kernel's store to 0 when the clone terminates. (see above) */ + pid_t tid; + while ((tid = atomic_load_acquire (&pd->tid)) != 0) + { + /* The kernel notifies a process which uses CLONE_CHILD_CLEARTID via + futex wake-up when the clone terminates. The memory location + contains the thread ID while the clone is running and is reset to + zero by the kernel afterwards. The kernel up to version 3.16.3 + does not use the private futex operations for futex wake-up when + the clone terminates. */ + int ret = __futex_abstimed_wait_cancelable64 ( + (unsigned int *) &pd->tid, tid, clockid, abstime, LLL_SHARED); + if (ret == ETIMEDOUT || ret == EOVERFLOW) + { + result = ret; + break; + } } pthread_cleanup_pop (0); diff --git a/sysdeps/nptl/futex-internal.h b/sysdeps/nptl/futex-internal.h index 96d1318..d5f13d1 100644 --- a/sysdeps/nptl/futex-internal.h +++ b/sysdeps/nptl/futex-internal.h @@ -390,55 +390,6 @@ futex_unlock_pi (unsigned int *futex_word, int private) } } -static __always_inline int -futex_timed_wait_cancel64 (pid_t *tidp, pid_t tid, - const struct __timespec64 *timeout, int private) -{ - int err = INTERNAL_SYSCALL_CANCEL (futex_time64, tidp, - __lll_private_flag (FUTEX_WAIT, private), - tid, timeout); -#ifndef __ASSUME_TIME64_SYSCALLS - if (err == -ENOSYS) - { - if (in_time_t_range (timeout->tv_sec)) - { - struct timespec ts32 = valid_timespec64_to_timespec (*timeout); - - err = INTERNAL_SYSCALL_CANCEL (futex, tidp, - __lll_private_flag (FUTEX_WAIT, - private), - tid, &ts32); - } - else - err = -EOVERFLOW; - } -#endif - switch (err) - { - case 0: - case -EAGAIN: - case -EINTR: - case -ETIMEDOUT: - case -EDEADLK: - case -ENOSYS: - case -EOVERFLOW: /* Passed absolute timeout uses 64 bit time_t type, but - underlying kernel does not support 64 bit time_t futex - syscalls. */ - case -EPERM: /* The caller is not allowed to attach itself to the futex. - Used to check if PI futexes are supported by the - kernel. */ - return -err; - - case -EINVAL: /* Either due to wrong alignment or due to the timeout not - being normalized. Must have been caused by a glibc or - application bug. */ - case -EFAULT: /* Must have been caused by a glibc or application bug. */ - /* No other errors are documented at this time. */ - default: - futex_fatal_error (); - } -} - /* The futex_abstimed_wait_cancelable64 has been moved to a separate file to avoid problems with exhausting available registers on some architectures - e.g. on m68k architecture. */ |