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Linux: Move timer helper routines from librt to libc

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This adds several temporary GLIBC_PRIVATE exports.  The symbol names
are changed so that they all start with __timer_.

It is now possible to invoke the fork handler directly, so
pthread_atfork is no longer necessary.  The associated error cannot
happen anymore, and cancellation handling can be removed from
the helper thread routine.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2021-06-25 10:51:31 +02:00
parent 1a5a653be2
commit 2c16cb88a6
7 changed files with 64 additions and 50 deletions
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14
sysdeps/unix/sysv/linux/timer_create.c
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@ -74,8 +74,8 @@ timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid)
else
{
/* Create the helper thread. */
pthread_once (&__helper_once, __start_helper_thread);
if (__helper_tid == 0)
pthread_once (&__timer_helper_once, __timer_start_helper_thread);
if (__timer_helper_tid == 0)
{
/* No resources to start the helper thread. */
__set_errno (EAGAIN);
@ -118,7 +118,7 @@ timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid)
{ .sigev_value.sival_ptr = newp,
.sigev_signo = SIGTIMER,
.sigev_notify = SIGEV_SIGNAL | SIGEV_THREAD_ID,
._sigev_un = { ._pad = { [0] = __helper_tid } } };
._sigev_un = { ._pad = { [0] = __timer_helper_tid } } };
/* Create the timer. */
int res;
@ -132,10 +132,10 @@ timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid)
}
/* Add to the queue of active timers with thread delivery. */
pthread_mutex_lock (&__active_timer_sigev_thread_lock);
newp->next = __active_timer_sigev_thread;
__active_timer_sigev_thread = newp;
pthread_mutex_unlock (&__active_timer_sigev_thread_lock);
pthread_mutex_lock (&__timer_active_sigev_thread_lock);
newp->next = __timer_active_sigev_thread;
__timer_active_sigev_thread = newp;
pthread_mutex_unlock (&__timer_active_sigev_thread_lock);
*timerid = timer_to_timerid (newp);
}