remove PID caching

Follow GNU C Library from c579f48edba88380635ab98cb612030e3ed8691e
and remove the PID caching. These simplifies the architecture specific
assembly code.
The run of the test suite found no regressions, it even solves
some of the test failures for x86/x86_64/sparc.

Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Acked-by: Matthew Fortune <Matthew.Fortune@imgtec.com>
Acked-by: Alexey Brodkin <Alexey.Brodkin@synopsys.com>

1 files changed, 84 insertions, 0 deletions

diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/nptl-signals.h b/libpthread/nptl/sysdeps/unix/sysv/linux/nptl-signals.h
new file mode 100644
index 000000000..43aa1a939
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/nptl-signals.h
@@ -0,0 +1,84 @@
+/* Special use of signals in NPTL internals.  Linux version.
+   Copyright (C) 2014-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <signal.h>
+
+/* The signal used for asynchronous cancelation.  */
+#define SIGCANCEL       __SIGRTMIN
+
+
+/* Signal needed for the kernel-supported POSIX timer implementation.
+   We can reuse the cancellation signal since we can distinguish
+   cancellation from timer expirations.  */
+#define SIGTIMER        SIGCANCEL
+
+
+/* Signal used to implement the setuid et.al. functions.  */
+#define SIGSETXID       (__SIGRTMIN + 1)
+
+
+/* Return is sig is used internally.  */
+static inline int
+__nptl_is_internal_signal (int sig)
+{
+  return (sig == SIGCANCEL) || (sig == SIGTIMER) || (sig == SIGSETXID);
+}
+
+/* Remove internal glibc signal from the mask.  */
+static inline void
+__nptl_clear_internal_signals (sigset_t *set)
+{
+  __sigdelset (set, SIGCANCEL);
+  __sigdelset (set, SIGTIMER);
+  __sigdelset (set, SIGSETXID);
+}
+
+#define SIGALL_SET \
+  ((__sigset_t) { .__val = {[0 ...  _SIGSET_NWORDS-1 ] =  -1 } })
+
+/* Block all signals, including internal glibc ones.  */
+static inline int
+__libc_signal_block_all (sigset_t *set)
+{
+  INTERNAL_SYSCALL_DECL (err);
+  return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &SIGALL_SET,
+			   set, _NSIG / 8);
+}
+
+/* Block all application signals (excluding internal glibc ones).  */
+static inline int
+__libc_signal_block_app (sigset_t *set)
+{
+  sigset_t allset = SIGALL_SET;
+  __nptl_clear_internal_signals (&allset);
+  INTERNAL_SYSCALL_DECL (err);
+  return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &allset, set,
+			   _NSIG / 8);
+}
+
+/* Restore current process signal mask.  */
+static inline int
+__libc_signal_restore_set (const sigset_t *set)
+{
+  INTERNAL_SYSCALL_DECL (err);
+  return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, set, NULL,
+			   _NSIG / 8);
+}
+
+/* Used to communicate with signal handler.  */
+extern struct xid_command *__xidcmd attribute_hidden;