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From: "Daniel P. Berrangé" <berrange@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com>,
	"Thomas Huth" <thuth@redhat.com>,
	qemu-devel@nongnu.org, "Peter Maydell" <peter.maydell@linaro.org>
Subject: Re: [PULL 15/26] configure, meson: move pthread_setname_np checks to Meson
Date: Mon, 15 Nov 2021 17:15:39 +0000	[thread overview]
Message-ID: <YZKVuz5VJN6e9zjo@redhat.com> (raw)
In-Reply-To: <20211014162938.430211-16-pbonzini@redhat.com>

On Thu, Oct 14, 2021 at 06:29:27PM +0200, Paolo Bonzini wrote:
> This makes the pthreads check dead in configure, so remove it
> as well.

This change appears broken

On v6.1.0

$ grep SETNAME_NP build/config-host.h
#define CONFIG_PTHREAD_SETNAME_NP_W_TID 1

While on git master

$ grep SETNAME_NP build/config-host.h
#define CONFIG_PTHREAD_SETNAME_NP_WO_TID
#define CONFIG_PTHREAD_SETNAME_NP_W_TID


it shoudn't be possible to have both these configs
satisfied as they're 2 completely different impls.

In the meson-log.txt we can see both tests passing, but with
warnings

  /home/berrange/src/virt/qemu/build/meson-private/tmpt191k3q1/testfile.c:9:5: warning: implicit declaration of function 'pthread_setname_np'; did you mean 'pthread_setcanceltype'? [-Wimplicit-function-declaration]

So it isn't actually validating the function parameter
signature, and then link is succeeding because the linker
doesn't care about the incompatible function signatures.

Peter meanwhile reports that he gets no pthread_Setname_np
at all, and his meson-build.log shows -Werror set. This
causes the missing fnuction signature to cause tests to
fail in both cases.

The original config.log shows _GNU_SOURCE being defined
for these tests, which would get the function signture
defined.

> 
> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> Message-Id: <20211007130829.632254-9-pbonzini@redhat.com>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  configure                | 78 ----------------------------------------
>  meson.build              | 23 ++++++++++++
>  util/qemu-thread-posix.c |  5 ++-
>  3 files changed, 25 insertions(+), 81 deletions(-)
> 
> diff --git a/configure b/configure
> index e78f58978f..c7e95e59cc 100755
> --- a/configure
> +++ b/configure
> @@ -3148,71 +3148,6 @@ if test "$modules" = yes; then
>      fi
>  fi
>  
> -##########################################
> -# pthread probe
> -PTHREADLIBS_LIST="-pthread -lpthread -lpthreadGC2"
> -
> -pthread=no
> -cat > $TMPC << EOF
> -#include <pthread.h>
> -static void *f(void *p) { return NULL; }
> -int main(void) {
> -  pthread_t thread;
> -  pthread_create(&thread, 0, f, 0);
> -  return 0;
> -}
> -EOF
> -if compile_prog "" "" ; then
> -  pthread=yes
> -else
> -  for pthread_lib in $PTHREADLIBS_LIST; do
> -    if compile_prog "" "$pthread_lib" ; then
> -      pthread=yes
> -      break
> -    fi
> -  done
> -fi
> -
> -if test "$mingw32" != yes && test "$pthread" = no; then
> -  error_exit "pthread check failed" \
> -      "Make sure to have the pthread libs and headers installed."
> -fi
> -
> -# check for pthread_setname_np with thread id
> -pthread_setname_np_w_tid=no
> -cat > $TMPC << EOF
> -#include <pthread.h>
> -
> -static void *f(void *p) { return NULL; }
> -int main(void)
> -{
> -    pthread_t thread;
> -    pthread_create(&thread, 0, f, 0);
> -    pthread_setname_np(thread, "QEMU");
> -    return 0;
> -}
> -EOF
> -if compile_prog "" "$pthread_lib" ; then
> -  pthread_setname_np_w_tid=yes
> -fi
> -
> -# check for pthread_setname_np without thread id
> -pthread_setname_np_wo_tid=no
> -cat > $TMPC << EOF
> -#include <pthread.h>
> -
> -static void *f(void *p) { pthread_setname_np("QEMU"); return NULL; }
> -int main(void)
> -{
> -    pthread_t thread;
> -    pthread_create(&thread, 0, f, 0);
> -    return 0;
> -}
> -EOF
> -if compile_prog "" "$pthread_lib" ; then
> -  pthread_setname_np_wo_tid=yes
> -fi
> -
>  ##########################################
>  # libssh probe
>  if test "$libssh" != "no" ; then
> @@ -4498,19 +4433,6 @@ if test "$debug_mutex" = "yes" ; then
>    echo "CONFIG_DEBUG_MUTEX=y" >> $config_host_mak
>  fi
>  
> -# Hold two types of flag:
> -#   CONFIG_THREAD_SETNAME_BYTHREAD  - we've got a way of setting the name on
> -#                                     a thread we have a handle to
> -#   CONFIG_PTHREAD_SETNAME_NP_W_TID - A way of doing it on a particular
> -#                                     platform
> -if test "$pthread_setname_np_w_tid" = "yes" ; then
> -  echo "CONFIG_THREAD_SETNAME_BYTHREAD=y" >> $config_host_mak
> -  echo "CONFIG_PTHREAD_SETNAME_NP_W_TID=y" >> $config_host_mak
> -elif test "$pthread_setname_np_wo_tid" = "yes" ; then
> -  echo "CONFIG_THREAD_SETNAME_BYTHREAD=y" >> $config_host_mak
> -  echo "CONFIG_PTHREAD_SETNAME_NP_WO_TID=y" >> $config_host_mak
> -fi
> -
>  if test "$bochs" = "yes" ; then
>    echo "CONFIG_BOCHS=y" >> $config_host_mak
>  fi
> diff --git a/meson.build b/meson.build
> index e8e728bf72..26fc4e5792 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -1584,6 +1584,29 @@ config_host_data.set('CONFIG_POSIX_MADVISE', cc.links(gnu_source_prefix + '''
>    #include <sys/mman.h>
>    #include <stddef.h>
>    int main(void) { return posix_madvise(NULL, 0, POSIX_MADV_DONTNEED); }'''))
> +
> +config_host_data.set('CONFIG_PTHREAD_SETNAME_NP_W_TID', cc.links('''
> +  #include <pthread.h>
> +
> +  static void *f(void *p) { return NULL; }
> +  int main(void)
> +  {
> +    pthread_t thread;
> +    pthread_create(&thread, 0, f, 0);
> +    pthread_setname_np(thread, "QEMU");
> +    return 0;
> +  }''', dependencies: threads))
> +config_host_data.set('CONFIG_PTHREAD_SETNAME_NP_WO_TID', cc.links('''
> +  #include <pthread.h>
> +
> +  static void *f(void *p) { pthread_setname_np("QEMU"); return NULL; }
> +  int main(void)
> +  {
> +    pthread_t thread;
> +    pthread_create(&thread, 0, f, 0);
> +    return 0;
> +  }''', dependencies: threads))
> +
>  config_host_data.set('CONFIG_SIGNALFD', cc.links(gnu_source_prefix + '''
>    #include <sys/signalfd.h>
>    #include <stddef.h>
> diff --git a/util/qemu-thread-posix.c b/util/qemu-thread-posix.c
> index 6c5004220d..e1225b63bd 100644
> --- a/util/qemu-thread-posix.c
> +++ b/util/qemu-thread-posix.c
> @@ -23,7 +23,8 @@ void qemu_thread_naming(bool enable)
>  {
>      name_threads = enable;
>  
> -#ifndef CONFIG_THREAD_SETNAME_BYTHREAD
> +#if !defined CONFIG_PTHREAD_SETNAME_NP_W_TID && \
> +    !defined CONFIG_PTHREAD_SETNAME_NP_WO_TID
>      /* This is a debugging option, not fatal */
>      if (enable) {
>          fprintf(stderr, "qemu: thread naming not supported on this host\n");
> @@ -522,7 +523,6 @@ static void *qemu_thread_start(void *args)
>      void *arg = qemu_thread_args->arg;
>      void *r;
>  
> -#ifdef CONFIG_THREAD_SETNAME_BYTHREAD
>      /* Attempt to set the threads name; note that this is for debug, so
>       * we're not going to fail if we can't set it.
>       */
> @@ -533,7 +533,6 @@ static void *qemu_thread_start(void *args)
>          pthread_setname_np(qemu_thread_args->name);
>  # endif
>      }
> -#endif
>      QEMU_TSAN_ANNOTATE_THREAD_NAME(qemu_thread_args->name);
>      g_free(qemu_thread_args->name);
>      g_free(qemu_thread_args);
> -- 
> 2.31.1
> 
> 
> 

Regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|



  reply	other threads:[~2021-11-15 17:17 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-14 16:29 [PULL 00/26] Meson changes for 2021-10-14 Paolo Bonzini
2021-10-14 16:29 ` [PULL 01/26] configure: remove --oss-lib Paolo Bonzini
2021-10-14 16:29 ` [PULL 02/26] audio: remove CONFIG_AUDIO_WIN_INT Paolo Bonzini
2021-10-14 16:29 ` [PULL 03/26] configure, meson: move audio driver detection to Meson Paolo Bonzini
2021-11-01 14:32   ` Peter Maydell
2021-10-14 16:29 ` [PULL 04/26] meson: define symbols for all available audio drivers Paolo Bonzini
2021-10-14 16:29 ` [PULL 05/26] configure: add command line options for " Paolo Bonzini
2021-10-14 16:29 ` [PULL 06/26] kconfig: split CONFIG_SPARSE_MEM from fuzzing Paolo Bonzini
2021-10-14 16:29 ` [PULL 07/26] configure, meson: move fuzzing configuration to Meson Paolo Bonzini
2021-10-14 16:29 ` [PULL 08/26] trace: simple: pass trace_file unmodified to config-host.h Paolo Bonzini
2021-10-14 16:29 ` [PULL 09/26] trace: move configuration from configure to Meson Paolo Bonzini
2021-10-14 16:29 ` [PULL 10/26] configure, meson: move CONFIG_HOST_DSOSUF " Paolo Bonzini
2021-10-14 16:29 ` [PULL 11/26] configure, meson: get HOST_WORDS_BIGENDIAN via the machine object Paolo Bonzini
2021-10-14 16:29 ` [PULL 12/26] configure, meson: remove CONFIG_GCOV from config-host.mak Paolo Bonzini
2021-10-14 16:29 ` [PULL 13/26] meson: HAVE_GDB_BIN is not used by C code Paolo Bonzini
2021-10-14 16:29 ` [PULL 14/26] configure, meson: move remaining HAVE_* compiler tests to Meson Paolo Bonzini
2021-10-14 16:29 ` [PULL 15/26] configure, meson: move pthread_setname_np checks " Paolo Bonzini
2021-11-15 17:15   ` Daniel P. Berrangé [this message]
2021-11-15 17:25     ` Peter Maydell
2021-10-14 16:29 ` [PULL 16/26] configure, meson: move libaio check to meson.build Paolo Bonzini
2021-10-14 16:29 ` [PULL 17/26] configure, meson: move vde detection to meson Paolo Bonzini
2021-10-14 16:29 ` [PULL 18/26] configure, meson: move netmap " Paolo Bonzini
2021-10-14 16:29 ` [PULL 19/26] configure, meson: move Spice configure handling " Paolo Bonzini
2021-10-14 16:29 ` [PULL 20/26] configure: remove obsolete Solaris ar check Paolo Bonzini
2021-10-14 16:29 ` [PULL 21/26] configure, meson: move more compiler checks to Meson Paolo Bonzini
2021-11-15 16:36   ` Peter Maydell
2021-11-15 16:42     ` Peter Maydell
2021-11-16  9:29       ` Paolo Bonzini
2021-11-16 13:13       ` Peter Maydell
2021-11-15 16:55     ` Peter Maydell
2021-10-14 16:29 ` [PULL 22/26] configure: remove deprecated --{enable, disable}-git-update Paolo Bonzini
2021-10-14 16:29 ` [PULL 23/26] configure: accept "internal" for --enable-capstone/slirp/fdt Paolo Bonzini
2021-10-14 16:29 ` [PULL 24/26] configure: prepare for auto-generated option parsing Paolo Bonzini
2021-10-14 16:29 ` [PULL 25/26] meson-buildoptions: include list of tracing backends Paolo Bonzini
2021-10-14 16:29 ` [PULL 26/26] configure: automatically parse command line for meson -D options Paolo Bonzini
2021-10-14 19:15 ` [PULL 00/26] Meson changes for 2021-10-14 Richard Henderson

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