Refactor Linux raise implementation (BZ#15368)

This patch changes both the nptl and libc Linux raise implementation
to avoid the issues described in BZ#15368.  The strategy used is
summarized in bug report first comment:

 1. Block all signals (including internal NPTL ones);
 2. Get pid and tid directly from syscall (not relying on cached
    values);
 3. Call tgkill;
 4. Restore old signal mask.

Tested on x86_64 and i686.

	[BZ #15368]
	* sysdeps/unix/sysv/linux/nptl-signals.h
	(__nptl_clear_internal_signals): New function.
	(__libc_signal_block_all): Likewise.
	(__libc_signal_block_app): Likewise.
	(__libc_signal_restore_set): Likewise.
	* sysdeps/unix/sysv/linux/pt-raise.c (raise): Use Linux raise.c
	implementation.
	* sysdeps/unix/sysv/linux/raise.c (raise): Reimplement to not use
	the cached pid/tid value in pthread structure.

1 files changed, 13 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index ed5daf1de6..4bc8a61bdf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2016-07-13  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
+
+	[BZ #15368]
+	* sysdeps/unix/sysv/linux/nptl-signals.h
+	(__nptl_clear_internal_signals): New function.
+	(__libc_signal_block_all): Likewise.
+	(__libc_signal_block_app): Likewise.
+	(__libc_signal_restore_set): Likewise.
+	* sysdeps/unix/sysv/linux/pt-raise.c (raise): Use Linux raise.c
+	implementation.
+	* sysdeps/unix/sysv/linux/raise.c (raise): Reimplement to not use
+	the cached pid/tid value in pthread structure.
+
 2016-07-13  H.J. Lu  <hongjiu.lu@intel.com>
 
 	[BZ #20347]