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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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22
sysdeps/unix/sysv/linux/kernel-posix-timers.h
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@ -26,19 +26,27 @@
extern int __no_posix_timers attribute_hidden;
/* Callback to start helper thread. */
extern void __start_helper_thread (void) attribute_hidden;
extern void __timer_start_helper_thread (void);
libc_hidden_proto (__timer_start_helper_thread)
/* Control variable for helper thread creation. */
extern pthread_once_t __helper_once attribute_hidden;
extern pthread_once_t __timer_helper_once;
libc_hidden_proto (__timer_helper_once)
/* Called from fork so that the new subprocess re-creates the
notification thread if necessary. */
void __timer_fork_subprocess (void) attribute_hidden;
/* TID of the helper thread. */
extern pid_t __helper_tid attribute_hidden;
extern pid_t __timer_helper_tid;
libc_hidden_proto (__timer_helper_tid)
/* List of active SIGEV_THREAD timers. */
extern struct timer *__active_timer_sigev_thread attribute_hidden;
/* Lock for the __active_timer_sigev_thread. */
extern pthread_mutex_t __active_timer_sigev_thread_lock attribute_hidden;
extern struct timer *__timer_active_sigev_thread;
libc_hidden_proto (__timer_active_sigev_thread)
/* Lock for __timer_active_sigev_thread. */
extern pthread_mutex_t __timer_active_sigev_thread_lock;
libc_hidden_proto (__timer_active_sigev_thread_lock)
/* Type of timers in the kernel. */
typedef int kernel_timer_t;