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nptl: Fix pthread_cancel cancelhandling atomic operations

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The 404656009b reversion did not setup the atomic loop to set the
cancel bits correctly.  The fix is essentially what pthread_cancel
did prior 26cfbb7162.

Checked on x86_64-linux-gnu and aarch64-linux-gnu.

(cherry picked from commit 62be968167)
This commit is contained in:
Adhemerval Zanella 2022-04-20 12:01:43 -03:00
parent 8e8d46d598
commit 68d3a9a696
1 changed files with 2 additions and 1 deletions
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3
nptl/pthread_cancel.c
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@ -121,6 +121,7 @@ __pthread_cancel (pthread_t th)
int newval; int newval;
do do
{ {
again:
newval = oldval | CANCELING_BITMASK | CANCELED_BITMASK; newval = oldval | CANCELING_BITMASK | CANCELED_BITMASK;
if (oldval == newval) if (oldval == newval)
break; break;
@ -134,7 +135,7 @@ __pthread_cancel (pthread_t th)
int newval2 = oldval | CANCELING_BITMASK; int newval2 = oldval | CANCELING_BITMASK;
if (!atomic_compare_exchange_weak_acquire (&pd->cancelhandling, if (!atomic_compare_exchange_weak_acquire (&pd->cancelhandling,
&oldval, newval2)) &oldval, newval2))
continue; goto again;
if (pd == THREAD_SELF) if (pd == THREAD_SELF)
/* This is not merely an optimization: An application may /* This is not merely an optimization: An application may