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nptl: Consolidate async cancel enable/disable implementation in libc

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Previously, the source file nptl/cancellation.c was compiled multiple
times, for libc, libpthread, librt.  This commit switches to a single
implementation, with new __pthread_enable_asynccancel@@GLIBC_PRIVATE,
__pthread_disable_asynccancel@@GLIBC_PRIVATE exports.

The almost-unused CANCEL_ASYNC and CANCEL_RESET macros are replaced
by LIBC_CANCEL_ASYNC and LIBC_CANCEL_ASYNC macros.  They call the
__pthread_* functions unconditionally now.  The macros are still
needed because shared code uses them; Hurd has different definitions.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2021-05-05 17:15:57 +02:00
parent 0197c1bc60
commit ce0b7961ae
14 changed files with 25 additions and 110 deletions
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4
nptl/pthread_create.c
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@ -353,7 +353,7 @@ START_THREAD_DEFN
have ownership (see CONCURRENCY NOTES above). */
if (__glibc_unlikely (pd->stopped_start))
{
int oldtype = CANCEL_ASYNC ();
int oldtype = LIBC_CANCEL_ASYNC ();
/* Get the lock the parent locked to force synchronization. */
lll_lock (pd->lock, LLL_PRIVATE);
@ -363,7 +363,7 @@ START_THREAD_DEFN
/* And give it up right away. */
lll_unlock (pd->lock, LLL_PRIVATE);
CANCEL_RESET (oldtype);
LIBC_CANCEL_RESET (oldtype);
}
LIBC_PROBE (pthread_start, 3, (pthread_t) pd, pd->start_routine, pd->arg);