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nptl: Install cancellation handler on pthread_cancel

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Now that cancellation is not used anymore to handle thread setup
creation failure, the sighandle can be installed only when
pthread_cancel is actually used.

Checked on x86_64-linux-gnu and aarch64-linux-gnu.
This commit is contained in:
Adhemerval Zanella
2021-05-24 18:56:59 -03:00
parent 02189e8fb0
commit 41c7295617
4 changed files with 28 additions and 45 deletions
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15
nptl/pthread_create.c
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@@ -67,21 +67,6 @@ late_init (void)
struct sigaction sa;
__sigemptyset (&sa.sa_mask);
/* Install the cancellation signal handler (in static builds only if
pthread_cancel has been linked in). If for some reason we cannot
install the handler we do not abort. Maybe we should, but it is
only asynchronous cancellation which is affected. */
#ifndef SHARED
extern __typeof (__nptl_sigcancel_handler) __nptl_sigcancel_handler
__attribute__ ((weak));
if (__nptl_sigcancel_handler != NULL)
#endif
{
sa.sa_sigaction = __nptl_sigcancel_handler;
sa.sa_flags = SA_SIGINFO;
(void) __libc_sigaction (SIGCANCEL, &sa, NULL);
}
/* Install the handle to change the threads' uid/gid. Use
SA_ONSTACK because the signal may be sent to threads that are
running with custom stacks. (This is less likely for