From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org
Subject: [PATCH 11/11] nptl: Use pthread_kill on pthread_cancel
Date: Wed, 26 May 2021 13:57:28 -0300 [thread overview]
Message-ID: <20210526165728.1772546-12-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <20210526165728.1772546-1-adhemerval.zanella@linaro.org>
It consolidates the tgkill call and it is the first step of making
pthread_cancel async-signal-safe. It also fix a possible issue
where the 'struct pthread' tid is not read atomically, which might
send an invalid cancellation signal (similar to what
db988e50a87f613cb6b9e98a2fc66a4848bc3546 fixed for pthread_join).
Checked on x86_64-linux-gnu and aarch64-linux-gnu.
---
nptl/pthreadP.h | 2 ++
nptl/pthread_cancel.c | 6 +-----
nptl/pthread_kill.c | 18 ++++++++++++------
3 files changed, 15 insertions(+), 11 deletions(-)
diff --git a/nptl/pthreadP.h b/nptl/pthreadP.h
index 618922f47a..675d1de753 100644
--- a/nptl/pthreadP.h
+++ b/nptl/pthreadP.h
@@ -515,6 +515,8 @@ libc_hidden_proto (__pthread_detach)
extern int __pthread_kill (pthread_t threadid, int signo);
libc_hidden_proto (__pthread_kill)
extern int __pthread_cancel (pthread_t th);
+extern int __pthread_kill_internal (pthread_t threadid, int signo)
+ attribute_hidden;
extern void __pthread_exit (void *value) __attribute__ ((__noreturn__));
libc_hidden_proto (__pthread_exit)
extern int __pthread_join (pthread_t threadid, void **thread_return);
diff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c
index 3be3d0fce7..e6dc135e9b 100644
--- a/nptl/pthread_cancel.c
+++ b/nptl/pthread_cancel.c
@@ -109,11 +109,7 @@ __pthread_cancel (pthread_t th)
return 0;
}
- pid_t pid = __getpid ();
- int val = INTERNAL_SYSCALL_CALL (tgkill, pid, pd->tid, SIGCANCEL);
- return INTERNAL_SYSCALL_ERROR_P (val)
- ? INTERNAL_SYSCALL_ERRNO (val)
- : 0;
+ return __pthread_kill_internal (th, SIGCANCEL);
}
versioned_symbol (libc, __pthread_cancel, pthread_cancel, GLIBC_2_34);
diff --git a/nptl/pthread_kill.c b/nptl/pthread_kill.c
index 0392c3f9e5..93387dd60a 100644
--- a/nptl/pthread_kill.c
+++ b/nptl/pthread_kill.c
@@ -21,13 +21,8 @@
#include <shlib-compat.h>
int
-__pthread_kill (pthread_t threadid, int signo)
+__pthread_kill_internal (pthread_t threadid, int signo)
{
- /* Disallow sending the signal we use for cancellation, timers,
- for the setxid implementation. */
- if (__is_internal_signal (signo))
- return EINVAL;
-
pid_t tid;
struct pthread *pd = (struct pthread *) threadid;
@@ -53,6 +48,17 @@ __pthread_kill (pthread_t threadid, int signo)
return val;
}
+
+int
+__pthread_kill (pthread_t threadid, int signo)
+{
+ /* Disallow sending the signal we use for cancellation, timers,
+ for the setxid implementation. */
+ if (__is_internal_signal (signo))
+ return EINVAL;
+
+ return __pthread_kill_internal (threadid, signo);
+}
/* Some architectures (for instance arm) might pull raise through libgcc, so
avoid the symbol version if it ends up being used on ld.so. */
#if !IS_IN(rtld)
--
2.30.2
prev parent reply other threads:[~2021-05-26 16:57 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-26 16:57 [PATCH 00/11] nptl: pthread cancellation refactor Adhemerval Zanella
2021-05-26 16:57 ` [PATCH 01/11] nptl: Move Linux createthread to nptl Adhemerval Zanella
2021-05-26 17:14 ` Florian Weimer
2021-05-26 16:57 ` [PATCH 02/11] nptl: Move createthread to pthread_create Adhemerval Zanella
2021-05-26 17:16 ` Florian Weimer
2021-05-26 17:29 ` Adhemerval Zanella
2021-05-26 16:57 ` [PATCH 03/11] support: Add xpthread_attr_setaffinity_np wrapper Adhemerval Zanella
2021-05-26 17:17 ` Florian Weimer
2021-05-27 22:35 ` Joseph Myers
2021-05-28 1:08 ` Adhemerval Zanella
2021-05-26 16:57 ` [PATCH 04/11] nptl: Add pthread_attr_setaffinity_np failure test Adhemerval Zanella
2021-05-26 17:21 ` Florian Weimer
2021-05-26 17:30 ` Adhemerval Zanella
2021-05-26 16:57 ` [PATCH 05/11] nptl: Deallocate the thread stack on setup failure (BZ #19511) Adhemerval Zanella
2021-05-26 17:33 ` Florian Weimer
2021-05-26 17:51 ` Adhemerval Zanella
2021-05-26 17:58 ` Florian Weimer
2021-05-26 19:19 ` Adhemerval Zanella
2021-05-26 18:21 ` Andreas Schwab
2021-05-26 18:40 ` Adhemerval Zanella
2021-05-26 19:26 ` Adhemerval Zanella
2021-05-27 7:43 ` Florian Weimer
2021-05-26 16:57 ` [PATCH 06/11] nptl: Install cancellation handler on pthread_cancel Adhemerval Zanella
2021-05-26 17:38 ` Florian Weimer
2021-05-26 17:52 ` Adhemerval Zanella
2021-05-26 16:57 ` [PATCH 07/11] nptl: Remove CANCELING_BITMASK Adhemerval Zanella
2021-05-26 18:02 ` Florian Weimer
2021-06-15 22:07 ` Florian Weimer
2021-06-15 23:33 ` Adhemerval Zanella
2021-06-16 12:46 ` Adhemerval Zanella
2021-05-26 16:57 ` [PATCH 08/11] nptl: Move cancel state out of cancelhandling Adhemerval Zanella
2021-05-26 18:20 ` Florian Weimer
2021-05-27 16:40 ` Adhemerval Zanella
2021-05-27 16:48 ` Florian Weimer
2021-05-27 16:57 ` Adhemerval Zanella
2021-05-26 16:57 ` [PATCH 09/11] nptl: Move cancel type " Adhemerval Zanella
2021-05-26 16:57 ` [PATCH 10/11] nptl: Implement raise in terms of pthread_kill Adhemerval Zanella
2021-05-26 16:57 ` Adhemerval Zanella [this message]
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